EV-03 round 2: a missing car power is unknown, and mode3 E/F has a state

- CarTracker.car_w returns None when the current reading carries no power
  (power entity unavailable or in a non-power unit); it can no longer raise
  into the control cycle, /status or the MQTT values.
- mode3 E and F are the card state "fault" (EN and NL).
- chargersim gains fault().

Co-Authored-By: Claude <noreply@anthropic.com>

goodwe_controller/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ### Not in a release yet
 
+- A new *Car* card on Home shows an Alfen charger: whether a car is connected, its power and today's energy. It only reads the charger, and the car's power no longer counts in the House tile or in what the batteries plan for the night. It is off until you choose a charger in Settings ([[EV-03]]).
 - During a real peak, a battery in its maintenance charge now stays paused instead of switching between charging and giving, and the batteries give only what keeps the peak under the limit ([[MAINT-28]]).
 
 ## 0.22.0

goodwe_controller/DOCS.md

@@ -251,6 +251,10 @@ The label and description each setting shows on the Configuration tab, in tab or
 | Safety | Opposing inverters time (s) | `circulation_hold_s` | For two or more inverters: how long they may push against each other before a safety stop. Derived value, leave it unchanged. |
 | Safety | Not delivering alarm after (s) | `delivery_hold_s` | For two or more inverters: how long one may fall short of its share before an alarm, which changes nothing. Derived value, leave it unchanged. |
 | Safety | Shadow mode | `shadow_mode` | The add-on makes every decision but keeps every inverter at 0 W. 'auto' does this while control is stopped, 'on' always, 'off' never. |
+| Car charger | Charger | `ev_charger` | Which car charger the add-on reads. Off leaves everything as it is. This version only reads the charger and never changes it. |
+| Car charger | Current setting entity | `ev_current_entity` | The entity that sets the charger's current. The add-on finds the charger's other entities from its name. |
+| Car charger | Charger limit (A) | `ev_max_a` | The most current the charger may ever be asked for. Never above what the charger reports. Lower it for a weaker fuse or cable. |
+| Car charger | Phases | `ev_phases` | How many phases the charger may use: 1, 3, or 1 and 3 (auto). |
 | Advanced | Start control on boot | `auto_start` | Off by default. Leave it off until the site is commissioned, so someone presses Start after each restart. |
 | Advanced | Control gain | `gain` | How much of the remaining error control corrects each cycle. Measured on real hardware, do not raise it. |
 | Advanced | Largest change per cycle (W) | `slew_w` | How far the command may move in one cycle. 0 follows “Inverter rating” and is recommended. |
@@ -3269,6 +3273,57 @@ row is printed **always**, including when it is zero: a row that reports
 staleness only once it is stale cannot be told from one that never reports
 it.
 
+### Car charger
+
+The add-on can read your car charger and show it on **Home**, on a *Car* card. In
+this version it only reads. It never changes the charger, so it is safe to run
+beside your own automation. Later versions will add charging modes.
+
+| option | meaning |
+|---|---|
+| `ev_charger` | `off` (the default: nothing changes at all) or `alfen_ha`, an Alfen charger through its Home Assistant integration. |
+| `ev_current_entity` | The charger's current setting, for example `number.wallbox_power_connector_max_current_socket_1`. The add-on finds the charger's other entities from this name. |
+| `ev_max_a` | The most current the charger may ever be asked for. It cannot be higher than the station limit the charger reports. |
+| `ev_phases` | `1`, `3` or `auto` (1 and 3). |
+
+**What the Car card shows.** The state (Charging, Connected waiting, No car
+connected, Car is full, Charger not reachable), the power and current, and the
+energy charged today. The car's power is taken out of the **House** tile and out
+of the house profile that plans the batteries' night charge, so the batteries
+no longer buy energy for a car that charged last night. The peak limit works as
+before: the car is still part of what the grid meter sees.
+
+**When the charger does not answer.** After 30 seconds the card says *Charger
+not reachable* and one amber row appears. After 5 minutes one notification
+follows. While the car reading is older than 15 seconds the House tile shows no
+reading, and that moment is left out of the house profile, rather than guessing
+how much the car took.
+
+**Another controller.** If the charger's current changes while the add-on writes
+nothing, something else sets it, usually your own automation. The page then shows
+the grey row *Another controller changes the charger*. That is expected while
+you migrate.
+
+**Moving your own automation to the add-on.** Each step can be undone.
+
+1. Install this version and set `ev_charger` to `alfen_ha`. The add-on reads the
+   charger and writes nothing. Compare the card with your automation for a few
+   days.
+2. When a later version adds charging modes, switch your automation **off**
+   (do not delete it) in the evening with the car unplugged, then choose the
+   add-on's Manual mode with the current your helper held. Plug in and check the
+   current on the card and on the charger's display.
+3. On the next sunny day, choose Solar, with *spare sun goes first to* set as
+   your priority switch was.
+4. Keep your Home Assistant helpers for a week. To go back, set the add-on mode
+   to Off and switch the automation on. After that you can delete the helpers and
+   the automation.
+
+Never let the automation and the add-on both write the charger.
+
+**Home Assistant entities.** With MQTT the add-on adds three sensors:
+`goodwe_car_power`, `goodwe_car_state` and `goodwe_car_today_kwh`.
+
 ### Site
 
 | option | meaning |
@@ -3388,6 +3443,14 @@ battery goes on as before. Check that the add-on can reach the internet and that
 the price service token is right. The notification goes by itself when a price
 is back. It is shown only while the monthly battery cycle is switched on.
 
+### Charger not reachable
+
+The add-on has not been able to read the car charger for 5 minutes, because its
+entities are unavailable or the charger's login is off. The charger keeps its
+last setting. The add-on changes nothing on the charger in any case. Check the
+charger's integration in Home Assistant. The notification goes by itself when
+the charger answers again.
+
 ### For installers: notifications
 
 A fixed tariff beside the price service raises no notification: it is the
@@ -3414,6 +3477,7 @@ default `info` hides it.
 | Meter reading may be stuck | alarm | `goodwe_meter_frozen` | SAFETY-18 |
 | Battery cycle did not finish | warning | `goodwe_maint_failed_<name>` | MAINT-13 |
 | No prices | warning | `goodwe_no_prices` | PRICE-01 |
+| Charger not reachable | warning | `goodwe_charger_unreachable` | EV-03 |
 
 **The Details link.** Home Assistant 2026.2 and newer show add-on pages at
 `/config/app/<slug>/documentation`; 2026.5 removed the old

goodwe_controller/app/chargers.py

@@ -0,0 +1,669 @@
+"""EV-03: the car charger seam, and the Alfen driver behind Home Assistant.
+
+SHAPED LIKE `app/drivers.py`'s `Driver` (DECISIONS/EV-03-charger-seam.md): one
+actuator per site, a census key, a read, a clamped write that says whether the
+charger took it, and a hand-back. A charger is a modulated actuator with a fail
+state, not one of DEV-01's on/off loads.
+
+THIS CARD NEVER WRITES TO THE CHARGER. `write_current`, `write_phases` and
+`release` are defined so the seam is whole, and NOTHING in the controller calls
+them: Off is the only mode. test_ev03.py greps the controller for a call and
+proves a full cycle makes no service call that names a charger entity.
+
+VALUES ARE BELIEVED ONLY IN THEIR OWN UNIT (as TEL-11 does for power): power in
+a power unit, energy in a kWh unit, current in A. A reading in another unit is
+absent, never converted by a guess. ABSENCE IS NEVER ZERO.
+
+The pure half (`CarTracker`, the state words, the entity table) takes its clock
+as an argument, so the checks need no sleep.
+"""
+
+from __future__ import annotations
+
+import re
+from dataclasses import dataclass
+
+from .hass import BAD_STATES
+from .solarfc import KWH_PER
+
+OFF = "off"
+ALFEN_HA = "alfen_ha"
+#: the `ev_charger` values the options accept
+SELECTABLE = (OFF, ALFEN_HA)
+PHASES_CHOICES = ("1", "3", "auto")
+
+# config.yaml's shipped defaults, mirrored (test_defaults_pin.py checks it).
+EV_OPTION_DEFAULTS = {"ev_charger": "off", "ev_current_entity": "",
+                      "ev_max_a": 16, "ev_phases": "auto"}
+
+
+def max_a(opts: dict):
+    """`ev_max_a` as a float, or None when it is not a number."""
+    raw = opts.get("ev_max_a", EV_OPTION_DEFAULTS["ev_max_a"])
+    if raw is None or raw == "":
+        raw = EV_OPTION_DEFAULTS["ev_max_a"]
+    try:
+        return float(raw)
+    except (TypeError, ValueError):
+        return None
+
+MIN_A = 6.0                 # IEC 61851: no car charges below 6 A
+ENTITY_MAX_A = 40.0         # the Alfen current entity's own range
+
+# Reachability and the car card's timers, in seconds.
+UNREACHABLE_S = 30.0        # entities unavailable / login off this long
+NOTIFY_S = 300.0            # then one warning notification
+FULL_B_S = 60.0             # mode3 B with current allowed this long: car full
+FULL_C_S = 600.0            # mode3 C under FULL_C_W this long: car full
+FULL_C_W = 200.0
+WRITER_HOLD_S = 3600.0      # "another controller" stays shown this long
+IDLE_A = 1.0                # a phase under this draws nothing
+
+# role -> (entity domain, suffix after `<x>_`). `current` is the setpoint, the
+# one the installer names; the rest are derived by swapping its suffix.
+SETPOINT_SUFFIX = "power_connector_max_current_socket_1"
+ROLES = {
+    "current": ("number", SETPOINT_SUFFIX),
+    "readback": ("sensor", "main_active_max_current_socket_1"),
+    "state": ("sensor", "mode3_state_socket_1"),
+    "display": ("sensor", "display_state_socket_1"),
+    "power": ("sensor", "active_power_total_socket_1"),
+    "energy": ("sensor", "meter_reading_socket_1"),
+    "l1": ("sensor", "current_l1_socket_1"),
+    "l2": ("sensor", "current_l2_socket_1"),
+    "l3": ("sensor", "current_l3_socket_1"),
+    "station": ("number", "max_station_current"),
+    "station_active": ("sensor", "main_station_active_max_current_socket_1"),
+    "phases_set": ("select", "installation_max_allowed_phases"),
+    "phases_read": ("sensor", "connector_1_max_allowed_of_phases"),
+    "error": ("sensor", "display_error_number_socket_1"),
+    "login": ("binary_sensor", "https_api_login_status"),
+}
+#: a missing one of these refuses the charger (not the add-on)
+REQUIRED = ("current", "readback", "state")
+_SETPOINT_RE = re.compile(r"^number\.(?P<x>.+)_" + SETPOINT_SUFFIX + "$")
+
+_ROLE_ORDER = tuple(ROLES)
+
+
+def census_key(entity) -> str:
+    """The SAFETY-28 form: stripped, lowercase."""
+    return str(entity or "").strip().lower()
+
+
+def entities_for(setpoint) -> dict:
+    """role -> entity id, derived from the setpoint entity by its suffix.
+    Empty when the setpoint does not end the way the Alfen integration names it."""
+    m = _SETPOINT_RE.match(str(setpoint or "").strip())
+    if not m:
+        return {}
+    x = m.group("x")
+    return {role: f"{dom}.{x}_{suffix}" for role, (dom, suffix) in ROLES.items()}
+
+
+# --------------------------------------------------------------------------- #
+# What a read gives
+# --------------------------------------------------------------------------- #
+@dataclass(frozen=True)
+class ChargerReading:
+    """One read of the charger. None means "did not answer", never zero."""
+
+    available: bool = False         # the integration answers
+    state: str | None = None        # mode3: "A", "B", "C", ... or None
+    connected: bool | None = None
+    charging: bool | None = None
+    power_w: float | None = None
+    energy_kwh: float | None = None  # the meter, total increasing
+    current_a: tuple = ()           # per phase, as many as read
+    setpoint_a: float | None = None  # the entity the installer named
+    allowed_a: float | None = None  # read-back of the limit the charger applies
+    phases_allowed: int | None = None
+    station_a: float | None = None  # the charger's own station limit
+    error: str | None = None        # None: no error (or not read)
+    display: str | None = None
+    why: str = ""                   # for the log only, "" when available
+
+
+def _state_obj(obj):
+    """(text, unit, attributes) of a state object, or (None, "", {})."""
+    if not isinstance(obj, dict):
+        return None, "", {}
+    raw = str(obj.get("state", "")).strip()
+    attrs = obj.get("attributes") if isinstance(obj.get("attributes"), dict) else {}
+    unit = str(attrs.get("unit_of_measurement") or "").strip()
+    return (None if raw.lower() in BAD_STATES else raw), unit, attrs
+
+
+def _amps(obj):
+    raw, unit, _ = _state_obj(obj)
+    if raw is None:
+        return None
+    try:
+        v = float(raw)
+    except ValueError:
+        return None
+    if v != v:
+        return None
+    if unit == "A":
+        return v
+    if unit == "mA":
+        return v / 1000.0
+    return None
+
+
+_W_PER = {"mW": 0.001, "W": 1.0, "kW": 1000.0, "MW": 1000000.0}
+
+
+def _watts(obj):
+    """Power in W, believed only in a power unit (its own copy of the rule: the
+    PV channel's reader stays out of the charger's, test_pv.py part 6)."""
+    raw, unit, _ = _state_obj(obj)
+    if raw is None or unit not in _W_PER:
+        return None
+    try:
+        v = float(raw) * _W_PER[unit]
+    except ValueError:
+        return None
+    return v if v == v else None
+
+
+def _kwh(obj):
+    raw, unit, _ = _state_obj(obj)
+    if raw is None or unit not in KWH_PER:
+        return None
+    try:
+        v = float(raw) * KWH_PER[unit]
+    except ValueError:
+        return None
+    return v if v == v and v >= 0 else None
+
+
+def _phases(obj):
+    raw, _u, _ = _state_obj(obj)
+    m = re.match(r"\s*([13])\s*phase", raw or "", re.I)
+    return int(m.group(1)) if m else None
+
+
+_MODE3 = re.compile(r"^(?:STATE[_ ]?)?([A-F])$", re.I)
+
+
+def mode3_letter(text) -> str | None:
+    m = _MODE3.match(str(text or "").strip())
+    return m.group(1).upper() if m else None
+
+
+def display_class(text) -> str | None:
+    """The fallback when mode3 is missing: firmware wording, so only the words
+    the owner's automation keys on. `connected`, `charging`, `none` or None."""
+    t = str(text or "").lower()
+    if not t:
+        return None
+    if "wait vehicle" in t or "ev connected" in t or "cable connected" in t:
+        return "connected"
+    if "charging" in t:
+        return "charging"
+    if t in ("available", "ready", "idle"):
+        return "none"
+    return None
+
+
+def reading_from_states(states: dict) -> ChargerReading:
+    """A `ChargerReading` from `{role: state object or None}`. Pure."""
+    def txt(role):
+        return _state_obj(states.get(role))[0]
+
+    login, state_o = txt("login"), states.get("state")
+    # Reachable: the three entities the card cannot do without answer, and the
+    # login sensor is not off.
+    gone = [r for r in REQUIRED if txt(r) is None]
+    if gone or (login or "").lower() == "off":
+        why = ("login off" if not gone else
+               "no answer from " + ", ".join(gone))
+        return ChargerReading(available=False, why=why)
+    letter = mode3_letter(txt("state"))
+    disp = txt("display")
+    cls = display_class(disp)
+    power = _watts(states.get("power"))
+    currents = tuple(a for a in (_amps(states.get(k)) for k in ("l1", "l2", "l3"))
+                     if a is not None)
+    if letter is not None:
+        connected, charging = letter in "BCD", letter in "CD"
+    elif cls is not None:
+        connected, charging = cls in ("connected", "charging"), cls == "charging"
+    else:
+        connected = charging = None
+    err = txt("error")
+    err_none = err is None or err.strip().startswith("0")
+    return ChargerReading(
+        available=True, state=letter, connected=connected, charging=charging,
+        power_w=power, energy_kwh=_kwh(states.get("energy")),
+        current_a=currents, setpoint_a=_amps(states.get("current")),
+        allowed_a=_amps(states.get("readback")),
+        phases_allowed=_phases(states.get("phases_read")),
+        station_a=_first(_amps(states.get("station_active")),
+                         _amps(states.get("station"))),
+        error=None if err_none else err, display=disp)
+
+
+def _first(*vals):
+    return next((v for v in vals if v is not None), None)
+
+
+@dataclass(frozen=True)
+class ChargerProbe:
+    """A read-only look: which derived entities exist."""
+
+    setpoint: str = ""
+    found: tuple = ()               # ((role, entity), ...)
+    missing: tuple = ()
+    station_a: float | None = None
+    derived: bool = True            # False: the setpoint's name does not fit
+
+    @property
+    def required_missing(self) -> tuple:
+        return tuple(r for r, _e in self.missing if r in REQUIRED)
+
+    @property
+    def ok(self) -> bool:
+        return self.derived and not self.required_missing
+
+
+def probe_from(setpoint, exists) -> ChargerProbe:
+    """`exists(entity) -> state object or None`. Pure; the caller reads."""
+    ents = entities_for(setpoint)
+    if not ents:
+        return ChargerProbe(setpoint=str(setpoint or ""), derived=False)
+    found, missing = [], []
+    for role in _ROLE_ORDER:
+        (found if exists(ents[role]) is not None else missing).append(
+            (role, ents[role]))
+    st = {r: exists(e) for r, e in ents.items()}
+    return ChargerProbe(str(setpoint), tuple(found), tuple(missing),
+                        station_a=_first(_amps(st.get("station_active")),
+                                         _amps(st.get("station"))))
+
+
+# --------------------------------------------------------------------------- #
+# The seam
+# --------------------------------------------------------------------------- #
+class ChargerNotBound(RuntimeError):
+    pass
+
+
+class ChargerDriver:
+    """One charger's I/O. Constructed from the options with no Home Assistant;
+    `bind()` gives it one. Everything that talks to the world is a coroutine."""
+
+    name = ""
+    writer_key = "ev_current_entity"
+    brand = ""
+    words: dict = {}
+
+    @classmethod
+    def from_options(cls, opts: dict) -> "ChargerDriver":
+        raise NotImplementedError
+
+    def bind(self, hass) -> "ChargerDriver":
+        return self
+
+    def bind_getter(self, getter) -> "ChargerDriver":
+        return self
+
+    def bound(self) -> bool:
+        return True
+
+    def configured(self) -> bool:
+        raise NotImplementedError
+
+    def actuator_id(self) -> str:
+        raise NotImplementedError
+
+    def entities(self) -> dict:
+        return {}
+
+    async def limits(self) -> tuple:
+        """`(min_a, max_a, phases)`; None where unread."""
+        raise NotImplementedError
+
+    async def read(self) -> ChargerReading:
+        raise NotImplementedError
+
+    # --- the write side. DEFINED, UNUSED BY THE CONTROLLER IN THIS CARD. ----
+    async def write_current(self, a: float) -> bool:
+        raise NotImplementedError
+
+    async def write_phases(self, n: int) -> bool:
+        raise NotImplementedError
+
+    async def release(self, mode: str) -> bool:
+        raise NotImplementedError
+
+    async def probe(self) -> ChargerProbe:
+        raise NotImplementedError
+
+
+class AlfenHaDriver(ChargerDriver):
+    """The Alfen behind its Home Assistant integration (`alfen_wallbox`)."""
+
+    name = ALFEN_HA
+    brand = "Alfen"
+
+    def __init__(self, current_entity="", limit_a=16.0):
+        self.current_entity = str(current_entity or "").strip()
+        self.max_a = float(limit_a)
+        self._ents = entities_for(self.current_entity)
+        self._hass = None
+        self._getter = None
+
+    @classmethod
+    def from_options(cls, opts: dict) -> "AlfenHaDriver":
+        amps = max_a(opts)
+        return cls(opts.get("ev_current_entity", ""),
+                   EV_OPTION_DEFAULTS["ev_max_a"] if amps is None else amps)
+
+    @classmethod
+    def actuator_id_of(cls, opts: dict) -> str:
+        return str(opts.get("ev_current_entity") or "").strip()
+
+    def bind(self, hass):
+        self._hass, self._getter = hass, None
+        return self
+
+    def bind_getter(self, getter):
+        self._hass, self._getter = None, getter
+        return self
+
+    def bound(self) -> bool:
+        return self._hass is not None or self._getter is not None
+
+    def _h(self):
+        hass = self._getter() if self._getter is not None else self._hass
+        if hass is None:
+            raise ChargerNotBound("the charger has no Home Assistant")
+        return hass
+
+    def configured(self) -> bool:
+        return bool(self._ents)
+
+    def actuator_id(self) -> str:
+        return self.current_entity
+
+    def entities(self) -> dict:
+        return dict(self._ents)
+
+    async def _states(self, roles=_ROLE_ORDER) -> dict:
+        import asyncio
+        hass = self._h()
+        got = await asyncio.gather(*(hass.state(self._ents[r]) for r in roles))
+        return dict(zip(roles, got))
+
+    async def limits(self) -> tuple:
+        st = await self._states(("station", "station_active", "phases_read"))
+        return (MIN_A, _first(_amps(st["station_active"]), _amps(st["station"])),
+                _phases(st["phases_read"]))
+
+    async def read(self) -> ChargerReading:
+        if not self.configured():
+            return ChargerReading(why="not set up")
+        return reading_from_states(await self._states())
+
+    async def probe(self) -> ChargerProbe:
+        st = await self._states()
+        by_ent = {self._ents[r]: o for r, o in st.items()}
+        return probe_from(self.current_entity, by_ent.get)
+
+    # --- the write side, UNUSED in EV-03 --------------------------------------
+    async def write_current(self, a: float) -> bool:
+        a = max(0.0, min(float(a), self.max_a, ENTITY_MAX_A))
+        return await self._h().set_number(self.current_entity, a)
+
+    async def write_phases(self, n: int) -> bool:
+        if n not in (1, 3):
+            return False
+        return await self._h().call("select", "select_option", {
+            "entity_id": self._ents["phases_set"],
+            "option": "1 Phase" if n == 1 else "3 Phases"})
+
+    async def release(self, mode: str) -> bool:
+        return await self.write_current(0.0) if mode == "solar" else True
+
+
+class UnavailableCharger(ChargerDriver):
+    """No charger: `ev_charger` is off, or the charger is refused. `why` says
+    which, for the Car card; nothing is read and nothing is written."""
+
+    name = OFF
+
+    def __init__(self, why="off", wanted=""):
+        self.why = why
+        self.wanted = wanted
+
+    @classmethod
+    def from_options(cls, opts: dict):
+        return cls()
+
+    def configured(self) -> bool:
+        return False
+
+    def actuator_id(self) -> str:
+        return ""
+
+    async def limits(self) -> tuple:
+        return None, None, None
+
+    async def read(self) -> ChargerReading:
+        return ChargerReading(why=self.why)
+
+    async def write_current(self, a):
+        return False
+
+    async def write_phases(self, n):
+        return False
+
+    async def release(self, mode):
+        return False
+
+    async def probe(self) -> ChargerProbe:
+        return ChargerProbe()
+
+
+def mode_of(opts: dict) -> str:
+    v = str((opts or {}).get("ev_charger") or OFF).strip()
+    return v if v in SELECTABLE else OFF
+
+
+def build(opts: dict) -> ChargerDriver:
+    """The driver the options name. Off, or a name this build lacks, is
+    `UnavailableCharger`; nothing here touches Home Assistant."""
+    which = mode_of(opts)
+    if which == ALFEN_HA:
+        drv = AlfenHaDriver.from_options(opts)
+        if drv.configured():
+            return drv
+        return UnavailableCharger("not set up", which)
+    return UnavailableCharger("off")
+
+
+def census_entity(opts: dict) -> str:
+    """The charger setpoint the SAFETY-28 census counts: only while a charger
+    is switched on (an off charger writes nothing)."""
+    if mode_of(opts) == OFF:
+        return ""
+    return str(opts.get("ev_current_entity") or "").strip()
+
+
+# --------------------------------------------------------------------------- #
+# The car's state, kept over time
+# --------------------------------------------------------------------------- #
+CHARGING, WAITING, NONE_, FULL, UNREACH, SETUP, FAULT = (
+    "charging", "waiting", "none", "full", "unreach", "setup", "fault")
+
+
+@dataclass
+class CarTracker:
+    """What the cycle learns about the car from the readings. Pure, clocked by
+    the caller (monotonic seconds for timers, UTC datetimes for the words).
+
+    FRESHNESS (the rule applied, and the one decision EV-03 makes about a stale
+    car reading): the car's power counts only while the last GOOD reading is not
+    older than `stale_s`, the same `stale_input_s` bound the meter reading has.
+    Older than that, `fresh()` is False and the House tile and the house profile
+    say they do not know, instead of keeping the last car figure."""
+
+    stale_s: float = 15.0
+    reading: ChargerReading | None = None
+    last_ok: float | None = None
+    bad_since: float | None = None
+    bad_since_utc: object = None
+    notified: bool = False
+    state_since_utc: object = None
+    last_status: str | None = None
+    last_good: ChargerReading | None = None
+    last_good_utc: object = None
+    b_since: float | None = None
+    c_low_since: float | None = None
+    writer_at_utc: object = None
+    _prev: tuple | None = None
+    # today's energy
+    day: str | None = None
+    today_kwh: float | None = None
+    last_kwh: float | None = None
+    persist: bool = False           # set when `today` changed, for the store
+
+    def observe(self, r: ChargerReading, now: float, now_utc, day: str):
+        self.reading = r
+        usable = r.available and r.power_w is not None
+        if r.available:
+            self.bad_since = None
+            self.bad_since_utc = None
+        elif self.bad_since is None:
+            self.bad_since, self.bad_since_utc = now, now_utc
+        if usable:
+            self.last_ok = now
+            self.last_good, self.last_good_utc = r, now_utc
+        if r.available:
+            self._writer(r, now_utc)
+            self._energy(r, day)
+            self._timers(r, now)
+        self._status_edge(now, now_utc)
+
+    # -- reachability ----------------------------------------------------------
+    def unreachable(self, now: float) -> bool:
+        return self.bad_since is not None and now - self.bad_since >= UNREACHABLE_S
+
+    def notify_due(self, now: float) -> bool:
+        return (self.bad_since is not None and not self.notified
+                and now - self.bad_since >= NOTIFY_S)
+
+    def fresh(self, now: float) -> bool:
+        return self.last_ok is not None and now - self.last_ok <= self.stale_s
+
+    def car_w(self, now: float):
+        """The car's power now, or None (unknown) when the reading is not fresh
+        OR the current reading carries no power. Never the last good figure: a
+        read that says "no power" contradicts it, and absence is never zero. It
+        never raises (telemetry has no foot in the control path)."""
+        r = self.reading
+        if not self.fresh(now) or r is None or not r.available \
+                or r.power_w is None:
+            return None
+        try:
+            return max(0.0, float(r.power_w))
+        except (TypeError, ValueError):
+            return None
+
+    # -- the two-writer detector ----------------------------------------------
+    def _writer(self, r, now_utc):
+        cur = (r.setpoint_a, r.allowed_a)
+        prev = self._prev
+        if prev is not None:
+            for a, b in zip(prev, cur):
+                if a is not None and b is not None and a != b:
+                    self.writer_at_utc = now_utc
+        # keep the last known value where one read came back empty
+        self._prev = tuple(b if b is not None else (prev[i] if prev else None)
+                           for i, b in enumerate(cur))
+
+    def other_writer(self, now_utc) -> bool:
+        t = self.writer_at_utc
+        return t is not None and (now_utc - t).total_seconds() <= WRITER_HOLD_S
+
+    # -- today's kWh -----------------------------------------------------------
+    def load(self, saved):
+        if isinstance(saved, dict):
+            try:
+                self.day = str(saved["day"])
+                self.today_kwh = float(saved["kwh"])
+                self.last_kwh = (None if saved.get("last") is None
+                                 else float(saved["last"]))
+            except (KeyError, TypeError, ValueError):
+                self.day = self.today_kwh = self.last_kwh = None
+
+    def dump(self) -> dict:
+        return {"day": self.day, "kwh": round(self.today_kwh or 0.0, 3),
+                "last": self.last_kwh}
+
+    def _energy(self, r, day):
+        e = r.energy_kwh
+        if self.day != day:
+            self.day, self.today_kwh = day, 0.0
+            self.last_kwh = e
+            self.persist = True
+            return
+        if e is None:
+            return
+        if self.last_kwh is not None:
+            # a meter that goes back has been reset: count from its new zero
+            d = e - self.last_kwh if e >= self.last_kwh else e
+            if d:
+                self.today_kwh = (self.today_kwh or 0.0) + d
+                self.persist = True
+        self.last_kwh = e
+        if self.today_kwh is None:
+            self.today_kwh = 0.0
+
+    # -- the car's state -------------------------------------------------------
+    def _timers(self, r, now):
+        allowed = r.allowed_a is not None and r.allowed_a >= MIN_A
+        self.b_since = (self.b_since if self.b_since is not None else now) \
+            if (r.state == "B" and allowed) else None
+        low = (r.state == "C" and allowed and r.power_w is not None
+               and r.power_w < FULL_C_W)
+        self.c_low_since = (self.c_low_since if self.c_low_since is not None
+                            else now) if low else None
+
+    def status(self, now: float, configured: bool = True):
+        """One of the state words, or None before the first reading."""
+        if not configured:
+            return SETUP
+        if self.unreachable(now):
+            return UNREACH
+        r = self.reading
+        if r is None or not r.available:
+            return None if self.last_good is None else self.last_status
+        if r.state in ("E", "F"):               # the charger's own error states
+            return FAULT
+        if r.state == "A" or (r.state is None and r.connected is False):
+            return NONE_
+        if r.state in ("B", "C", "D") or r.connected:
+            if self.b_since is not None and now - self.b_since >= FULL_B_S:
+                return FULL
+            if self.c_low_since is not None and \
+                    now - self.c_low_since >= FULL_C_S:
+                return FULL
+            return CHARGING if r.charging else WAITING
+        return None
+
+    def _status_edge(self, now, now_utc):
+        s = self.status(now)
+        if s != self.last_status and s is not None:
+            self.last_status, self.state_since_utc = s, now_utc
+        elif s is None and self.last_status is None:
+            pass
+
+    def phases_in_use(self) -> int | None:
+        r = self.reading
+        if r is None or not r.current_a:
+            return None
+        n = sum(1 for a in r.current_a if a >= IDLE_A)
+        return n or None

goodwe_controller/app/ctl_alarms.py

@@ -401,6 +401,29 @@ class AlarmsMixin:
             await self.hass.call("persistent_notification", "dismiss",
                                  messages.prices_back().data())
 
+    async def check_charger(self) -> None:
+        """EV-03. One warning notification when the car charger has not
+        answered for 5 minutes, taken down when it does; the WARNING log line
+        is edge-logged. READ ONLY: this raises a notification and calls no
+        service on the charger."""
+        if not self.charger.configured():
+            return
+        now = self.car_now()
+        self.car_log_edges(now)
+        if self.car.notify_due(now) and not self._car_announced:
+            self._car_announced = True
+            self.car.notified = True
+            since = brussels(self.car.bad_since_utc)
+            await self.hass.call("persistent_notification", "create",
+                                 messages.charger_unreachable(
+                                     f"{since:%H:%M}",
+                                     self.charger.brand or "Alfen").data())
+        elif self.car.bad_since is None and self._car_announced:
+            self._car_announced = False
+            self.car.notified = False
+            await self.hass.call("persistent_notification", "dismiss",
+                                 messages.charger_back().data())
+
     async def check_fixed_note(self) -> None:
         """PRICE-01 G1. First cycle only: one INFO line when `static_profile`
         sits beside `price_service` (the plan's last fallback, not a fault, so

goodwe_controller/app/ctl_cycle.py

@@ -1047,6 +1047,7 @@ class CycleMixin:
         # Not a safety check, so it is one of the cheap ones: an attribute test
         # and, on a change only, one Home Assistant call.
         await self.check_price_gap()
+        await self.check_charger()
         await self.check_fixed_note()
 
         # SAFETY-31's alarm, and its boundary is the LATCH, not a number: it

goodwe_controller/app/ctl_inputs.py

@@ -13,7 +13,9 @@ from . import freshness
 from . import lateness
 from . import messages
 from . import pv as pv_read
+from . import chargers
 from .price import brussels, price_option, provider_configured
+from .hass import OUTAGE
 from .price_chain import uses_chain
 from .static_tariff import static_status
 from .rows import tariff_plan_row
@@ -48,6 +50,10 @@ FC_HOLD_KEY = "solar_fc_hold"
 FORECAST_READ_S = 60.0
 
 
+# EV-03: the car's energy today, kept so a restart does not lose it.
+CAR_TODAY_KEY = "car_today"
+
+
 class InputsMixin:
     def _readings_late(self, standing_w):
         """SAFETY-128: update the answer gate; seconds the late verdict has
@@ -102,6 +108,89 @@ class InputsMixin:
         return "input"
 
     # -- io ------------------------------------------------------------------
+    # -- EV-03: the car charger, READ ONLY ----------------------------------------
+    @property
+    def car_enabled(self) -> bool:
+        """`ev_charger` is on, whether or not the charger could be set up."""
+        return chargers.mode_of(self.o) != chargers.OFF
+
+    def car_now(self) -> float:
+        return freshness.monotonic()
+
+    def car_term(self) -> tuple:
+        """`(car_w, unknown)`: what the House tile and the house profile take
+        out for the car. `(0.0, False)` with no charger, so a site without one
+        is exactly as before. With one, a reading older than `stale_input_s`
+        (the meter's own bound) is UNKNOWN, never the last figure: the tile
+        shows no reading and the profile leaves that moment out."""
+        if not self.charger.configured():
+            return 0.0, False
+        w = self.car.car_w(self.car_now())
+        return (0.0, True) if w is None else (w, False)
+
+    async def _read_charger(self, now_mono: float) -> None:
+        """One read of the charger, and what the tracker learns from it. It
+        never raises (telemetry has no foot in the control path) and it only
+        reads: nothing here, or anywhere in this card, writes to the charger."""
+        now_utc = datetime.now(timezone.utc)
+        day = brussels(now_utc).date().isoformat()
+        try:
+            if not self._charger_probed:
+                pr = await asyncio.wait_for(self.charger.probe(), 5.0)
+                if OUTAGE.waiting():
+                    raise RuntimeError("Home Assistant is not answering")
+                self._charger_probed = True
+                self._judge_probe(pr)
+                if not self.charger.configured():
+                    return
+            reading = await asyncio.wait_for(self.charger.read(), 5.0)
+        except Exception as err:                        # noqa: BLE001
+            _LOG.debug("The charger could not be read: %s", err)
+            reading = chargers.ChargerReading(why="no answer")
+        self.car.observe(reading, now_mono, now_utc, day)
+        if self.car.persist:
+            self.car.persist = False
+            self.store.set(CAR_TODAY_KEY, self.car.dump())
+
+    def _judge_probe(self, pr) -> None:
+        """A charger whose setpoint, read-back or state entity is missing, or
+        whose limit is above the station limit, is REFUSED: the add-on starts
+        and the Car card says so. Said once."""
+        why = None
+        if not pr.ok:
+            why = "not_found"
+            _LOG.warning("The car charger is not set up, because Home "
+                         "Assistant has no entity it needs: CHARGER_NOT_FOUND.")
+            _LOG.debug("Charger entities missing: %s.",
+                       ", ".join(e for _r, e in pr.missing) or "the name")
+        else:
+            amps = chargers.max_a(self.o)
+            if pr.station_a is not None and amps is not None \
+                    and amps > pr.station_a:
+                why = "limit"
+                _LOG.warning("The charger limit is above what the charger "
+                             "allows, so the charger is not used: "
+                             "CHARGER_LIMIT.")
+                _LOG.debug("ev_max_a %.0f A, station limit %.0f A.", amps,
+                           pr.station_a)
+        if why is not None:
+            self.charger_refused = why
+            self.charger = chargers.UnavailableCharger(why, chargers.ALFEN_HA)
+
+    def car_log_edges(self, now_mono: float) -> None:
+        """One WARNING when the charger goes unreachable, one INFO when it is
+        back. Edge-logged, never every cycle."""
+        down = self.car.unreachable(now_mono)
+        if down and not self._car_down_logged:
+            self._car_down_logged = True
+            _LOG.warning("The car charger does not answer, so the Car card has "
+                         "no reading: CHARGER_UNREACHABLE.")
+            _LOG.debug("The charger entities read unavailable, or its login "
+                       "is off, for %.0f s.", chargers.UNREACHABLE_S)
+        elif not down and self._car_down_logged and self.car.bad_since is None:
+            self._car_down_logged = False
+            _LOG.info("The car charger answers again.")
+
     @property
     def pv_roster(self) -> tuple:
         """Every configured PV production entity, or `()` (TEL-11/TEL-12). ONE
@@ -209,6 +298,10 @@ class InputsMixin:
         _reads = [self._read_unit(inv, now_mono) for inv in self.inverters]
         if self.pv_roster:
             _reads.append(self._read_pv())
+        # EV-03: the charger, read only, in the same gather. Nothing is added
+        # without a charger, so a site with none runs exactly as before.
+        if self.charger.configured():
+            _reads.append(self._read_charger(now_mono))
         # OPT-11 P4: the solar forecast, in the same gather (a slow sensor must
         # not delay control), at most once per FORECAST_READ_S.
         if self.fc_entity is not None and (

goodwe_controller/app/ctl_status.py

@@ -15,7 +15,8 @@ from .freeze import rail_unreachable, rail_w
 from .hass import OUTAGE
 from .maintenance import IDLE
 from .mqtt import (
-    announced_units, optional_keys, parse_command, unit_slugs, unit_state_key,
+    PAYLOAD_NONE, announced_units, optional_keys, parse_command, unit_slugs,
+    unit_state_key,
 )
 from . import peakguard
 from . import pv as pv_read
@@ -135,6 +136,10 @@ class StatusMixin:
         if "pv" in optional_keys(self.o):
             values["pv"] = (None if self.pv_w is None
                             else round(self.pv_w, 1))
+        # EV-03: the car, only with a charger switched on (the same predicate
+        # that announces the three sensors). Absence is `None`, never 0.
+        if "car_state" in optional_keys(self.o):
+            values.update(self.car_values())
         # ⚠️ ONLY when P1 ingestion is running: the ESP32's stale-input
         # watchdog subscribes to sensor.goodwe_p1_sample_age and forces layer-1
         # failsafe at max_age_s, so with meter_source off a published age would
@@ -161,6 +166,41 @@ class StatusMixin:
         values.update(self.mode_values())
         self.mqtt.publish(values)
 
+    # -- EV-03: the car charger ------------------------------------------------
+    def car_rows(self) -> list:
+        """The charger's status rows: amber when it is not set up or does not
+        answer, grey while something else changes it."""
+        if not self.charger.configured():
+            return [{"ok": False, "warn": True, "id": "charger_setup",
+                     "text": messages.row_charger_setup()}]
+        out = []
+        if self.car.unreachable(self.car_now()):
+            out.append({"ok": False, "warn": True, "id": "charger",
+                        "text": messages.row_charger_unreach(
+                            f"{brussels(self.car.bad_since_utc):%H:%M}")})
+        if self.car.other_writer(datetime.now(timezone.utc)):
+            out.append({"ok": True, "warn": True, "id": "charger_writer",
+                        "text": messages.row_charger_writer()})
+        return out
+
+    def car_values(self) -> dict:
+        """The MQTT values for the three car sensors."""
+        now = self.car_now()
+        state = self.car.status(now, self.charger.configured())
+        r = self.car.reading
+        down = state in (None, "unreach", "setup")
+        with homeview.in_lang("en"):
+            word = homeview.car_state_word(state)
+        return {
+            "car_state": word,
+            # `ABSENT_AS_UNKNOWN` stays the one PV key (test_pv.py): an absent
+            # car figure is HA's own "no value" payload, sent by name.
+            "car_power": (PAYLOAD_NONE if down or r is None
+                          or r.power_w is None else round(r.power_w, 1)),
+            "car_today_kwh": (PAYLOAD_NONE if self.car.today_kwh is None
+                              else round(self.car.today_kwh, 3)),
+        }
+
     # -- UI ------------------------------------------------------------------
     def checks(self, when: datetime | None = None) -> list:
         """The status rows. `when` is the reference time for anything billed by
@@ -613,6 +653,9 @@ class StatusMixin:
                 out.append({"ok": False, "warn": True, "id": "pv",
                             "text": messages.row_pv_stray(
                                 _inv_list.index(ent) + 1)})
+        # EV-03: the car charger's rows, only with a charger switched on.
+        if self.car_enabled:
+            out.extend(self.car_rows())
         return out
 
     def status_payload(self, lang: str = "en") -> dict:

goodwe_controller/app/ctl_trade.py

@@ -388,8 +388,18 @@ class TradeMixin:
                 price_now = None
         house = (None if self.grid is None or self.site_batt_w is None
                  else float(self.grid) + float(self.site_batt_w))
+        # EV-03: the car is not the house. Out of the profile that plans the
+        # batteries' night charge; with a charger whose reading is not fresh
+        # the moment is left out (None), not guessed.
+        # ONLY the profile's sample: `house` below stays what it was, since
+        # the battery decision's input is not part of this card.
+        house_sample = house
+        if house is not None:
+            _car_w, _car_unknown = self.car_term()
+            house_sample = (None if _car_unknown else max(0.0, house - _car_w)
+                            if _car_w else house)
         if self.house_profile is not None and \
-                self.house_profile.add(now, house):
+                self.house_profile.add(now, house_sample):
             self.store.set(HOUSE_PROFILE_KEY, self.house_profile.dump())
         targets = self.plan_targets()
         if targets is None:

goodwe_controller/app/homeview.py

@@ -72,16 +72,26 @@ def flow(w, *, shadow=False):
     return "resting"
 
 
-def now_block(*, grid_w, pv_w, batt_w, has_solar, shadow, settled=True):
+def now_block(*, grid_w, pv_w, batt_w, has_solar, shadow, settled=True,
+              car_w=0.0, car_unknown=False):
     """The four tiles. `house_w` needs all three readings, so without a solar
-    reading it is None rather than a number that leaves the sun out."""
+    reading it is None rather than a number that leaves the sun out.
+
+    EV-03: `car_w` is what a car charger takes, and it is not the house, so it
+    is taken out of House (the Car card shows it). `car_unknown` is a charger
+    whose reading is not fresh: House then has no figure rather than one that
+    may hold the car. Both default to "no charger", the figure as before."""
     house, disagree = None, False
     if has_solar and None not in (grid_w, pv_w, batt_w):
-        house = float(grid_w) + float(pv_w) + float(batt_w)
+        house = float(grid_w) + float(pv_w) + float(batt_w) - float(car_w or 0.0)
+        if car_unknown:
+            house = None
         # The three are read at slightly different moments, so the sum can dip
         # under zero. Inside the idle band that is 0 W; beyond it the readings
         # disagree and no house figure is shown.
-        if house < -IDLE_W:
+        if house is None:
+            pass
+        elif house < -IDLE_W:
             house, disagree = None, True
         elif house < 0.0:
             house = 0.0
@@ -1070,6 +1080,7 @@ ATTN_DOCS = {
     "not_keeping_up": messages.T_LOOP_BOUND,
     "circulating": messages.T_CIRCULATING,
     "delivery": messages.S_NOT_DELIVERING,
+    "charger": messages.T_CHARGER_UNREACH,
 }
 
 
@@ -1187,7 +1198,10 @@ def _build(c, *, level, checks, now, held=None, waiting=False):
                   "sub": banner_sub(kind)},
         "now": now_block(grid_w=c.grid, pv_w=c.pv_w, batt_w=c.site_batt_w,
                          has_solar=bool(c.pv_roster), shadow=shadow,
-                         settled=settled),
+                         settled=settled,
+                         **dict(zip(("car_w", "car_unknown"),
+                                    c.car_term()))),
+        "car": car_block(c, now),
         "batteries": rows,
         "plan": plan,
         "modes_on": bool(getattr(c, "modes_on", False)),
@@ -1208,6 +1222,85 @@ def _docs_url():
                                                        messages._site["ha"])
 
 
+# --------------------------------------------------------------------------- #
+# EV-03: the Car card. READ ONLY: Off is the only mode in this version.
+# --------------------------------------------------------------------------- #
+_CAR_KIND = {"charging": "ok", "full": "ok", "unreach": "warn",
+             "setup": "warn", "fault": "warn"}
+
+
+def car_state_word(key) -> str:
+    return _t("car.state." + (key if key else "wait"))
+
+
+def car_phases_word(n) -> str:
+    return _t("car.phase_one") if n == 1 else _t("car.phase_many", n=n)
+
+
+def _car_big(key, c, r, good):
+    if key == "charging" and r is not None and r.power_w is not None:
+        parts = [_dec(f"{r.power_w / 1000:.1f}")
+                 + " kW"]
+        amps = (r.allowed_a if r.allowed_a is not None
+                else max(r.current_a) if r.current_a else None)
+        if amps is not None:
+            parts.append(f"{amps:.0f} A")
+        n = c.car.phases_in_use()
+        if n:
+            parts.append(car_phases_word(n))
+        return " · ".join(parts)
+    if key == "unreach":
+        t = c.car.last_good_utc
+        return (_t("car.big.seen", t=hhmm(t)) if t is not None
+                else _t("car.big.no_reading"))
+    if key == "charging":                       # the reading is too old
+        return _t("car.big.no_reading")
+    return _t("car.big." + (key or "wait"))
+
+
+def _car_why(key, c, good):
+    brand = (getattr(c.charger, "brand", "") or "Alfen")
+    if key == "unreach":
+        a = None if good is None else good.setpoint_a
+        if a is None and good is not None:
+            a = good.allowed_a
+        if a is not None:
+            return _t("car.why.unreach_a", a=f"{a:.0f}", brand=brand)
+        return _t("car.why.unreach", brand=brand)
+    if key == "setup":
+        why = {"not_found": "not_found", "limit": "limit"}.get(
+            c.charger_refused or "", "name")
+        return _t("car.why." + why)
+    return _t("car.why." + (key if key else "wait"))
+
+
+def car_block(c, now):
+    """The Car card for `/status`, or None when no charger is switched on (the
+    page then draws nothing, as before)."""
+    if not getattr(c, "car_enabled", False):
+        return None
+    mono = c.car_now()
+    configured = c.charger.configured()
+    key = c.car.status(mono, configured)
+    r = c.car.reading if configured else None
+    good = c.car.last_good
+    fresh = configured and c.car.fresh(mono)
+    today = None
+    if configured and c.car.today_kwh is not None:
+        today = _t("car.today", kwh=_kwh(c.car.today_kwh))
+    return {
+        "state": key or "wait",
+        "chip": car_state_word(key),
+        "kind": _CAR_KIND.get(key, "muted"),
+        "big": _car_big(key, c, r if fresh else None, good),
+        "today": today,
+        "why": _car_why(key, c, good),
+        "mode": "off",
+        "power_w": (None if not fresh or r is None or r.power_w is None
+                    else round(float(r.power_w), 1)),
+    }
+
+
 # =========================================================================== #
 # The words. STYLE.md: plain, short, present tense. A plan line is at most
 # two sentences of at most 12 words each (UX-13 design, section 4); a title at
@@ -1715,6 +1808,13 @@ def _samples() -> list:
     out += [("plan", day_note(k, pct=70, name="Battery A", at="08:15",
                               kwh="9.2 kWh", count="6.4 kWh"))
             for k in words["day"]]
+    out += [("title", _t("car.state." + k)) for k in words["car"]["state"]]
+    out += [("plan", _t("car.big." + k, t="09:12")) for k in
+            words["car"]["big"]]
+    out += [("plan", _t("car.why." + k, a="10", brand="Alfen"))
+            for k in words["car"]["why"]]
+    out += [("plan", _t("car.today", kwh="14.2 kWh")),
+            ("plan", "11.0 kW · 16 A · " + _t("car.phase_many", n=3))]
     out += [("plan", line_no_trade(k)) for k in
             ("not_covered", "no_prices", "peak", "not_firm", "not_worth",
              "no_level")]

goodwe_controller/app/main.py

@@ -42,6 +42,7 @@ from .arbiter import (
     P_SAFETY, SET, Claim, Resolution, actuator_for, pre_resolve, resolve,
 )
 from . import allocator
+from . import chargers
 from . import dayplan
 from . import modetrade
 from . import packmode
@@ -564,6 +565,17 @@ class Controller(InputsMixin, WritesMixin, TradeMixin, CycleMixin, AlarmsMixin,
         self._charge_latch = _load_latch(
             (getattr(store, "data", None) or {}).get(CHARGE_LATCH_KEY),
             datetime.now(timezone.utc))
+        # EV-03: the car charger, READ ONLY. Off builds `UnavailableCharger`,
+        # which reads nothing, so a site without a charger is unchanged.
+        self.charger = chargers.build(opts)
+        self.charger.bind_getter(lambda: self.hass)
+        self.car = chargers.CarTracker(
+            stale_s=float(opts.get("stale_input_s", 15) or 15))
+        self.car.load((getattr(store, "data", None) or {}).get("car_today"))
+        self.charger_refused = None
+        self._charger_probed = False
+        self._car_down_logged = False
+        self._car_announced = False
         self.house_profile = None
         if self.fc_entity is not None:
             self.house_profile = dayplan.HouseProfile(

goodwe_controller/app/messages.py

@@ -186,6 +186,8 @@ T_OUTPUT_CLAMP_NL = "Vermogensvraag te hoog"
 T_PEAK_SATURATED_NL = "Belasting te hoog voor de batterij"
 T_METER_FROZEN_NL = "Meter staat mogelijk vast"
 TITLE_NL = {T_LOOP_BOUND: T_LOOP_BOUND_NL, T_OUTPUT_CLAMP: T_OUTPUT_CLAMP_NL}
+T_CHARGER_UNREACH = "Charger not reachable"
+T_CHARGER_UNREACH_NL = "Laadpaal onbereikbaar"
 T_NO_PRICES = "No prices"
 T_NO_PRICES_NL = "Prijzen ontbreken"
 
@@ -198,6 +200,7 @@ ID_NOT_DELIVERING = "goodwe_not_delivering_{slug}"
 ID_METER_FROZEN = "goodwe_meter_frozen"
 ID_MAINT_FAILED = "goodwe_maint_failed_{slug}"
 ID_NO_PRICES = "goodwe_no_prices"
+ID_CHARGER_UNREACH = "goodwe_charger_unreachable"
 # PRICE-01: an earlier build raised a card with this id. Nothing raises it now;
 # the add-on only dismisses it at start.
 OLD_FIXED_CARD_ID = "goodwe_fixed_tariff_unused"
@@ -465,6 +468,43 @@ def row_no_prices(since=None, now=None) -> str:
               "Nog geen prijzen, onderhoud wacht.")
 
 
+def charger_unreachable(since_text_, brand="Alfen") -> Notice:
+    """EV-03: the car charger has not answered for 5 minutes. Said once."""
+    en = (f"The add-on cannot reach the car charger since {since_text_}, so "
+          f"check the {brand} integration in Home Assistant.")
+    nl = (f"De add-on kan de laadpaal niet bereiken sinds {since_text_}, dus "
+          f"controleer de {brand}-integratie in Home Assistant.")
+    return Notice(ID_CHARGER_UNREACH, WARNING, T_CHARGER_UNREACH, en,
+                  body_nl=f"{T_CHARGER_UNREACH_NL}. {nl}")
+
+
+def charger_back() -> Dismiss:
+    """EV-03: takes the 'Charger not reachable' notification down."""
+    return Dismiss(ID_CHARGER_UNREACH)
+
+
+def row_charger_unreach(since_text_) -> str:
+    """EV-03: the amber row while the charger does not answer."""
+    return Bi(f"The add-on cannot reach the charger since {since_text_}.",
+              f"De add-on kan de laadpaal niet bereiken sinds {since_text_}.")
+
+
+def row_charger_writer() -> str:
+    """EV-03: the grey row while something else sets the charger's current."""
+    return Bi("Something else changes the charger, and this add-on only reads "
+              "it.",
+              "Iets anders wijzigt de laadpaal en deze add-on leest alleen.")
+
+
+def row_charger_setup() -> str:
+    """EV-03: the amber row when the charger's entities are not found."""
+    return Bi("The add-on cannot find the charger, so check its entity in "
+              "Settings.",
+              "De add-on vindt de laadpaal niet, dus controleer de entiteit "
+              "bij Instellingen.")
+
+
+
 def row_maint_waits(until_text: str) -> str:
     """MAINT-13: the status row while a failed cycle waits."""
     return Bi(f"Waits until {until_text} after a cycle that did not finish.",
@@ -1661,6 +1701,9 @@ def status_samples() -> list:
         ("row_no_prices", AMBER, row_no_prices(*_SINCE_SAMPLE)),
         ("row_no_prices", AMBER, row_no_prices(*_SINCE_OLDER)),
         ("row_no_prices", AMBER, row_no_prices()),
+        ("row_charger_unreach", AMBER, row_charger_unreach("09:12")),
+        ("row_charger_writer", GREEN, row_charger_writer()),
+        ("row_charger_setup", AMBER, row_charger_setup()),
     ]
 
 
@@ -1696,6 +1739,7 @@ def samples() -> list:
         no_prices(*_SINCE_SAMPLE),
         no_prices(*_SINCE_OLDER),
         no_prices(),
+        charger_unreachable("09:12"),
     ]
 
 
@@ -1758,6 +1802,11 @@ LABELS = {
     "solar_trust_pct": "Trust in the forecast",
     "p1_phase_import_entities": "Import entities per phase",
     "p1_phase_export_entities": "Export entities per phase",
+    # EV-03
+    "ev_charger": "Charger",
+    "ev_current_entity": "Current setting entity",
+    "ev_max_a": "Charger limit",
+    "ev_phases": "Phases",
 }
 
 
@@ -1838,6 +1887,10 @@ LABELS_NL = {
     "solar_trust_pct": "Vertrouwen in de prognose",
     "p1_phase_import_entities": "Afname-entiteiten per fase",
     "p1_phase_export_entities": "Injectie-entiteiten per fase",
+    "ev_charger": "Laadpaal",
+    "ev_current_entity": "Entiteit van de laadstroom",
+    "ev_max_a": "Laadpaalgrens",
+    "ev_phases": "Fasen",
 }
 # The inverter list shows two of them under a shorter name.
 UNIT_LABELS_NL = {"setpoint_entity": "Setpoint-entiteit",

goodwe_controller/app/mqtt.py

@@ -139,6 +139,11 @@ SENSORS = [
 # a charge-power limit, or the optimiser declining to charge.
 OPTIONAL_SENSORS = [
     ("pv", "goodwe_pv_power", "PV power", "W", "power", "measurement", None),
+    # EV-03: only with a car charger switched on. Read only: there are no
+    # command entities in this version.
+    ("car_power", "goodwe_car_power", "Car power", "W", "power", "measurement", "mdi:car-electric"),
+    ("car_state", "goodwe_car_state", "Car state", None, None, None, "mdi:ev-station"),
+    ("car_today_kwh", "goodwe_car_today_kwh", "Car energy today", "kWh", "energy", "total_increasing", "mdi:ev-station"),
 ]
 
 # ⚠️ HA's OWN "this sensor has no value" PAYLOAD, and the one place this add-on
@@ -192,7 +197,11 @@ def optional_keys(opts: dict) -> tuple:
     # `_load()` is the same decision for the same kind of reason. Measured, not
     # assumed: move this line to module scope and test_mqtt.py part 8 dies.
     from . import pv as _pv
-    return ("pv",) if _pv.entities(opts) else ()
+    from . import chargers as _ch               # EV-03: same reason
+    out = ("pv",) if _pv.entities(opts) else ()
+    if _ch.census_entity(opts):
+        out += ("car_power", "car_state", "car_today_kwh")
+    return out
 
 
 BASE = "goodwe_ctl"

goodwe_controller/app/selfconfig.py

@@ -82,7 +82,7 @@ import os
 
 import aiohttp
 
-from . import messages
+from . import chargers, messages
 from .configui import changed_keys
 from .inverter import build_roster
 from .validate import validate_startup_config, validate_unit_ranges
@@ -362,6 +362,18 @@ async def problems_and_ranges(opts: dict, hass=None, notes=None):
     unread = [unit.driver.actuator_id() for unit in units
               if unit.driver.configured() and unit.dev_min is None
               and unit.dev_max is None]
+    # EV-03: the charger limit may not exceed the station limit the charger
+    # reports. A read only; a charger that does not answer skips the check.
+    if hass is not None and chargers.mode_of(opts) != chargers.OFF:
+        drv = chargers.build(opts)
+        if drv.configured():
+            _lo, station, _ph = await drv.bind(hass).limits()
+            amps = chargers.max_a(opts)
+            if station is not None and amps is not None and amps > station:
+                problems.append(
+                    f"{messages.setting('ev_max_a')} is {amps:.0f} A, but the "
+                    f"charger allows at most {station:.0f} A. Lower it to "
+                    f"{station:.0f} A or less.")
     return problems, unread
 
 

goodwe_controller/app/static/app.css

@@ -272,3 +272,8 @@ table.fct th,table.fct td{padding:4px 3px;text-align:right;border-bottom:1px sol
 table.fct th:first-child,table.fct td:first-child{text-align:left}
 table.fct th{color:var(--muted);font-weight:600}
 .ymax{position:absolute;top:-2px;left:2px;font-size:10px;color:var(--faint);pointer-events:none}
+
+/* EV-03: the Car card */
+.car-big{font-size:20px;font-weight:700;line-height:1.3;margin:8px 0 2px;font-variant-numeric:tabular-nums}
+.car-lab{margin:12px 0 4px;color:var(--muted)}
+.car-why{display:grid;grid-template-columns:auto 1fr;gap:10px;margin-top:12px}

goodwe_controller/app/static/app.js

@@ -113,7 +113,8 @@
     const setup = S.setup_only === true;
     banner($("#home-banner"), S.level, setup ? t("setup_only.name") : S.banner, structured ? S.state.sub : setup ? t("setup_only.description") : "", S.level === "bad" ? "alert" : null);
     ["#c-now", "#c-plan", "#c-peak", "#c-attn"].forEach((id) => { $(id).hidden = !structured; });
-    if (structured) { renderNow(); renderPlan(); renderPeak(); renderAttention(); }
+    if (structured) { renderNow(); renderCar(); renderPlan(); renderPeak(); renderAttention(); }
+    else $("#c-car").hidden = true;
     renderControl(structured, setup);
     renderDetails(!structured && !setup);
     renderBatteries(force);
@@ -145,6 +146,20 @@
       h("div", { class: "small muted", style: "grid-column:1/-1" }, b.now))));
   }
 
+  /* ---------------- Home: the car (read only) ---------------- */
+  function renderCar() {
+    const c = S.car;
+    $("#c-car").hidden = !c;
+    if (!c) return;
+    const chip = $("#car-chip");
+    chip.textContent = c.chip;
+    chip.className = "chip" + (c.kind === "warn" ? " rs" : c.kind === "ok" ? " now" : "");
+    $("#car-big").textContent = c.big;
+    $("#car-today").textContent = c.today || "";
+    $("#car-today").hidden = !c.today;
+    $("#car-why").textContent = c.why;
+  }
+
   /* ---------------- Home: today's plan ---------------- */
   const LEGEND = [["cheap", "background:var(--cheap)"], ["dear", "background:repeating-linear-gradient(135deg,var(--dear) 0 3px,transparent 3px 5px)"],
                   ["grid", "background:var(--accent)"], ["give", "background:repeating-linear-gradient(135deg,var(--house) 0 3px,transparent 3px 5px)"],

goodwe_controller/app/static/index.html

@@ -39,6 +39,16 @@
     <div id="home-batts" style="margin-top:6px"></div>
   </div>
 
+  <div class="card" id="c-car" hidden>
+    <div class="row spread"><h2 data-t="car.name"></h2><span class="chip" id="car-chip"></span></div>
+    <div class="car-big" id="car-big"></div>
+    <div class="small muted" id="car-today"></div>
+    <div class="small car-lab" data-t="car.mode"></div>
+    <div class="seg" role="radiogroup" id="car-mode" data-t-label="car.mode"><button type="button" role="radio" aria-checked="true" data-t="car.mode_off"></button></div>
+    <p class="tiny muted" style="margin:6px 0 0" data-t="car.help_off"></p>
+    <div class="car-why small"><span class="muted" data-t="car.why"></span><span id="car-why"></span></div>
+  </div>
+
   <div class="card" id="c-plan">
     <div class="row spread"><h2 data-t="plan.name"></h2><span class="chip tiny muted" id="verdict"></span></div>
     <div class="small" id="plan-head"></div>

goodwe_controller/app/ui_text/en.json

@@ -4,6 +4,7 @@
     "inverters": {"name": "Inverters and batteries", "description": "The inverters the add-on controls, and your solar."},
     "tariff": {"name": "Tariff and prices", "description": "What you pay and are paid per kWh."},
     "safety": {"name": "Safety limits", "description": "The peak limit, starting and stopping, and the safety stops."},
+    "car": {"name": "Car charger", "description": "Which charger the add-on reads, and its limits."},
     "maintenance": {"name": "Maintenance", "description": "The monthly battery cycle and the log."},
     "tuning": {"name": "Control tuning", "description": "For support only, because these were measured on real hardware."}
   },
@@ -33,6 +34,8 @@
     "fallback": {"none": "None", "fixed": "One price", "daynight": "Day and night", "custom": "Other time windows"},
     "region": {"flanders": "Flanders, Fluvius Antwerpen", "own": "I enter my own figure"},
     "meter_source": {"off": "One grid power entity", "ha_dsmr": "Import and export entities", "mqtt_p1": "Meter over MQTT", "ha_signed": "One net power entity", "homewizard_local": "HomeWizard meter on the network"},
+    "ev_charger": {"off": "None", "alfen_ha": "Alfen (Home Assistant integration)"},
+    "ev_phases": {"1": "1 phase", "3": "3 phases", "auto": "1 and 3"},
     "meter_phases": {"1": "1 phase", "3": "3 phases"},
     "shadow_mode": {"auto": "Automatic", "on": "Always on", "off": "Off"},
     "price_provider": {"generic_dayahead": "Day-ahead market price", "custom_formula": "Your own price formula", "manual_csv": "A price file", "price_service": "Your own price service"},
@@ -87,6 +90,7 @@
       "loading": "Loading the forecast."
     },
     "peak": {"name": "Peak limit", "this_month": "This month's peak", "limit": "Limit", "none": "None recorded yet", "unreadable": "Cannot be read now"},
+    "car": {"name": "Car", "mode": "Mode", "mode_off": "Off", "help_off": "The add-on leaves the charger alone.", "why": "Why"},
     "attention": {"name": "Needs attention", "nothing": "Nothing to look at", "to_look": "to look at", "details": "Details", "alarm": "Alarm", "warning": "Warning", "info": "Info"},
     "control": {"name": "Control", "stop": "Stop control", "start": "Start control", "maint_start": "Start a battery cycle now", "maint_abort": "Stop the battery cycle", "docs": "Add-on documentation", "more": "More actions"},
     "details": {"name": "Details for installers", "rows": "Status rows", "checks": "Checks", "event": "Last event"},
@@ -296,6 +300,26 @@
       "waiting": "Control resumes by itself when Home Assistant answers.",
       "warning": "See Needs attention below."
     },
+    "car": {
+      "state": {"charging": "Charging", "waiting": "Connected, waiting", "none": "No car connected", "full": "Car is full", "unreach": "Charger not reachable", "setup": "Charger not set up", "fault": "Charger fault", "wait": "No reading yet"},
+      "big": {"waiting": "Connected, not charging.", "none": "Nothing to charge.", "full": "The car is full.", "seen": "Last seen at {t}.", "no_reading": "No reading.", "setup": "Not set up.", "fault": "The charger reports a fault.", "wait": "No reading yet."},
+      "phase_one": "1 phase",
+      "phase_many": "{n} phases",
+      "today": "{kwh} charged today.",
+      "why": {
+        "charging": "The charger is charging the car. The add-on leaves it alone.",
+        "waiting": "The car is connected and not charging. The add-on leaves the charger alone.",
+        "none": "No car is connected.",
+        "full": "The car stopped charging by itself.",
+        "unreach_a": "The charger keeps its last setting, {a} A. Check the {brand} integration in Home Assistant.",
+        "unreach": "The add-on cannot read the charger. Check the {brand} integration in Home Assistant.",
+        "not_found": "The add-on cannot find the charger. Check the current setting entity in Settings.",
+        "limit": "The charger limit is above what the charger allows. Lower it in Settings.",
+        "name": "The current setting entity does not fit the charger. Check it in Settings.",
+        "fault": "The charger reports a fault. Check it at the charger itself.",
+        "wait": "Waiting for the first reading."
+      }
+    },
     "tile": {
       "not_set_up": "Not set up",
       "no_reading": "No reading",
@@ -499,6 +523,9 @@
       "estop": "Emergency stop",
       "pv": "Solar reading",
       "solar_forecast": "Solar forecast",
+      "charger": "Charger not reachable",
+      "charger_writer": "Something else changes the charger",
+      "charger_setup": "Charger not set up",
       "none": "Inverter connection"
     },
     "months": ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]

goodwe_controller/app/ui_text/nl.json

@@ -4,6 +4,7 @@
     "inverters": {"name": "Omvormers en batterijen", "description": "De omvormers die de add-on regelt, en uw zonnepanelen."},
     "tariff": {"name": "Tarief en prijzen", "description": "Wat u per kWh betaalt en terugkrijgt."},
     "safety": {"name": "Veiligheidsgrenzen", "description": "De piekgrens, starten en stoppen, en de veiligheidsstops."},
+    "car": {"name": "Laadpaal", "description": "Welke laadpaal de add-on leest, en haar grenzen."},
     "maintenance": {"name": "Onderhoud", "description": "De maandelijkse batterijcyclus en het logboek."},
     "tuning": {"name": "Afstelling van de regeling", "description": "Alleen voor support, want deze zijn gemeten op echte hardware."}
   },
@@ -33,6 +34,8 @@
     "fallback": {"none": "Geen", "fixed": "Eén prijs", "daynight": "Dag en nacht", "custom": "Andere tijdvakken"},
     "region": {"flanders": "Vlaanderen, Fluvius Antwerpen", "own": "Ik vul zelf een bedrag in"},
     "meter_source": {"off": "Eén entiteit voor netvermogen", "ha_dsmr": "Entiteiten voor afname en injectie", "mqtt_p1": "Meter via MQTT", "ha_signed": "Eén entiteit voor nettovermogen", "homewizard_local": "HomeWizard-meter op het netwerk"},
+    "ev_charger": {"off": "Geen", "alfen_ha": "Alfen (Home Assistant-integratie)"},
+    "ev_phases": {"1": "1 fase", "3": "3 fasen", "auto": "1 en 3"},
     "meter_phases": {"1": "1 fase", "3": "3 fasen"},
     "shadow_mode": {"auto": "Automatisch", "on": "Altijd aan", "off": "Uit"},
     "price_provider": {"generic_dayahead": "Day-aheadprijs van de markt", "custom_formula": "Uw eigen prijsformule", "manual_csv": "Een prijsbestand", "price_service": "Uw eigen prijsdienst"},
@@ -84,6 +87,7 @@
       "loading": "De prognose wordt geladen."
     },
     "peak": {"name": "Piekgrens", "this_month": "Piek van deze maand", "limit": "Grens", "none": "Nog niets gemeten", "unreadable": "Nu niet leesbaar"},
+    "car": {"name": "Auto", "mode": "Modus", "mode_off": "Uit", "help_off": "De add-on laat de laadpaal ongemoeid.", "why": "Waarom"},
     "attention": {"name": "Vraagt aandacht", "nothing": "Niets om na te kijken", "to_look": "na te kijken", "details": "Details", "alarm": "Alarm", "warning": "Waarschuwing", "info": "Info"},
     "control": {"name": "Regeling", "stop": "Regeling stoppen", "start": "Regeling starten", "maint_start": "Nu een batterijcyclus starten", "maint_abort": "Batterijcyclus stoppen", "docs": "Documentatie van de add-on", "more": "Meer acties"},
     "details": {"name": "Details voor installateurs", "rows": "Statusregels", "checks": "Controles", "event": "Laatste gebeurtenis"},
@@ -250,6 +254,26 @@
     "verdict": {"held": "Op 0 W gehouden", "stopped": "Gestopt", "cycle": "Vandaag maandelijkse cyclus", "trade": "Handelt op prijs", "house": "Volgt het huis"},
     "pill": {"running": "Actief", "shadow": "Schaduwmodus", "stopped": "Gestopt", "alarm": "Heeft u nu nodig", "waiting": "Wacht op Home Assistant", "warning": "Actief, met een waarschuwing"},
     "banner_sub": {"running": "De batterijen volgen het plan hieronder.", "shadow": "De plannen hieronder tonen wat de add-on zou doen.", "stopped": "Start de regeling hieronder als u klaar bent.", "alarm": "Zie Vraagt aandacht hieronder voor wat u moet doen.", "waiting": "De regeling gaat vanzelf verder zodra Home Assistant antwoordt.", "warning": "Zie Vraagt aandacht hieronder."},
+    "car": {
+      "state": {"charging": "Laadt", "waiting": "Aangesloten, wacht", "none": "Geen auto aangesloten", "full": "Auto is vol", "unreach": "Laadpaal onbereikbaar", "setup": "Laadpaal niet ingesteld", "fault": "Laadpaal storing", "wait": "Nog geen meting"},
+      "big": {"waiting": "Aangesloten, laadt niet.", "none": "Niets te laden.", "full": "De auto is vol.", "seen": "Laatst gezien om {t}.", "no_reading": "Geen meting.", "setup": "Niet ingesteld.", "fault": "De laadpaal meldt een storing.", "wait": "Nog geen meting."},
+      "phase_one": "1 fase",
+      "phase_many": "{n} fasen",
+      "today": "Vandaag {kwh} geladen.",
+      "why": {
+        "charging": "De laadpaal laadt de auto. De add-on laat haar met rust.",
+        "waiting": "De auto is aangesloten en laadt niet. De add-on laat de laadpaal met rust.",
+        "none": "Er is geen auto aangesloten.",
+        "full": "De auto is zelf gestopt met laden.",
+        "unreach_a": "De laadpaal houdt haar laatste instelling, {a} A. Controleer de {brand}-integratie in Home Assistant.",
+        "unreach": "De add-on kan de laadpaal niet lezen. Controleer de {brand}-integratie in Home Assistant.",
+        "not_found": "De add-on vindt de laadpaal niet. Controleer de entiteit van de laadstroom bij Instellingen.",
+        "limit": "De laadpaalgrens is hoger dan de laadpaal toestaat. Verlaag ze bij Instellingen.",
+        "name": "De entiteit van de laadstroom past niet bij de laadpaal. Controleer ze bij Instellingen.",
+        "fault": "De laadpaal meldt een storing. Controleer ze aan de laadpaal zelf.",
+        "wait": "Wacht op de eerste meting."
+      }
+    },
     "tile": {"not_set_up": "Niet ingesteld", "no_reading": "Geen meting", "producing": "Produceert", "not_producing": "Produceert niet", "needs_solar": "Zonnemeting nodig", "not_adding_up": "Metingen kloppen niet", "using": "Verbruikt", "taking": "Neemt af van het net", "feeding": "Injecteert", "balanced": "In evenwicht", "giving": "Levert stroom", "charging": "Laadt", "resting": "Rust"},
     "now": {
       "no_reading": "Geen meting van deze batterij.",
@@ -420,6 +444,9 @@
       "estop": "Noodstop",
       "pv": "Meting van de zonnepanelen",
       "solar_forecast": "Zonneprognose",
+      "charger": "Laadpaal onbereikbaar",
+      "charger_writer": "Iets anders wijzigt de laadpaal",
+      "charger_setup": "Laadpaal niet ingesteld",
       "none": "Verbinding met de omvormer"
     },
     "months": ["januari", "februari", "maart", "april", "mei", "juni", "juli", "augustus", "september", "oktober", "november", "december"]

goodwe_controller/app/uilayout.py

@@ -77,6 +77,7 @@ _MAINT = (("maintenance_enabled", "==", True),)
 _ONE = (("inverter_count", "==", 1),)
 _SEVERAL = (("inverter_count", ">", 1),)
 _PHASES = (("meter_phases", ">", 1),)
+_CAR = (("ev_charger", "!=", "off"),)
 # One inverter stored flat has no name or capacity (uimodel._roster_encode).
 _LISTED = (("inverter_shape", "!=", "flat"),)
 
@@ -222,6 +223,17 @@ GROUPS = (
             Field("delivery_hold_s", LOCKED, "s", step=5, show=_SEVERAL),
         ), collapsed=True),
     )),
+    # EV-03: the car charger, read only. Everything after the choice shows
+    # only while a charger is switched on.
+    Group("car", (
+        Part("", (
+            Field("ev_charger", CHOICE, simple=True),
+            Field("ev_current_entity", ENTITY, kind="number", simple=True,
+                  show=_CAR),
+            Field("ev_max_a", SLIDER, "A", simple=True, show=_CAR),
+            Field("ev_phases", SEGMENTED, simple=True, show=_CAR),
+        )),
+    )),
     Group("maintenance", (
         Part("", (
             Field("maintenance_enabled", TOGGLE),

goodwe_controller/app/validate.py

@@ -332,7 +332,7 @@ import math
 import re
 from typing import NamedTuple
 
-from . import dayplan, messages, pv, solarfc
+from . import chargers, dayplan, messages, pv, solarfc
 from .arbitrage import enabled as arbitrage_on
 from .control import SLEW_RAIL_FRAC, LOOP_TICK_S, PLANT_SETTLE_S
 from . import drivers
@@ -667,6 +667,34 @@ def _labels(keys, joiner: str = "and") -> str:
     return f" {joiner} ".join(S(k) for k in keys)
 
 
+def _charger_problems(opts: dict, writers: dict) -> list[str]:
+    """EV-03: the car charger options. A charger whose entities are missing is
+    refused at run time (the Car card says so), not here: it never stops the
+    add-on. What stops it is a setpoint that an inverter also writes."""
+    out: list[str] = []
+    raw = opts.get("ev_charger", chargers.OFF)
+    if raw not in (None, "") and str(raw).strip() not in chargers.SELECTABLE:
+        out.append(f"{S('ev_charger')} is {messages.shown(raw)}. Choose "
+                   f"{', '.join(chargers.SELECTABLE)}.")
+        return out
+    if chargers.mode_of(opts) == chargers.OFF:
+        return out
+    ph = opts.get("ev_phases", chargers.EV_OPTION_DEFAULTS["ev_phases"])
+    if str(ph).strip() not in chargers.PHASES_CHOICES:
+        out.append(f"{S('ev_phases')} is {messages.shown(ph)}. Choose 1, 3 or "
+                   "auto.")
+    amps = chargers.max_a(opts)
+    if amps is None or not chargers.MIN_A <= amps <= chargers.ENTITY_MAX_A:
+        out.append(f"{S('ev_max_a')} is {messages.shown(opts.get('ev_max_a'))}"
+                   f". Set it from {chargers.MIN_A:.0f} to "
+                   f"{chargers.ENTITY_MAX_A:.0f} A.")
+    entity = chargers.census_entity(opts)
+    if entity and drivers.census_key(entity) in writers:
+        out.append(f"{S('ev_current_entity')} is {entity}, which an inverter "
+                   "also uses. Give the charger its own entity.")
+    return out
+
+
 def _roster_problems(opts: dict) -> list[str]:
     """Rule 9 (CFG-04): the `inverters:` roster, refused where it cannot mean
     what it says.
@@ -956,6 +984,12 @@ def validate_startup_config(opts: dict, dev_min=None, dev_max=None,
                 f"{actuator}: {', '.join(who)}. Give each inverter its own "
                 "setpoint entity.")
 
+    # --- EV-03: the car charger's setpoint is a writer too ---------------------
+    # Counted in the census beside the inverters', and kept apart from
+    # `actuator_writers()` so setup-only mode still reads "no inverter". An
+    # inverter's entity named as the charger is two writers on one actuator.
+    problems.extend(_charger_problems(opts, writers))
+
     # --- 9. CFG-04's roster, graded BEFORE anything reads a per-unit number --
     # ⚠️ FIRST, THOUGH IT IS THE NEWEST RULE. Rules 5 and 6 below now ask the
     # roster what one unit may be commanded, so a roster that is nonsense has to
@@ -1921,6 +1955,7 @@ def config_notes(opts: dict, *, entities: dict | None = None,
     notes: list[Note] = []
     if entities is not None:
         _entity_notes(notes, opts, entities)
+        _charger_notes(notes, opts, entities)
     cap = _number(opts, "peak_cap_w", None)
     if month_peak_w is not None and cap is not None and cap < month_peak_w:
         _advise(notes, "warn", ("peak_cap_w",),
@@ -1932,6 +1967,94 @@ def config_notes(opts: dict, *, entities: dict | None = None,
     return notes
 
 
+def charger_probe_rows(opts: dict, entities: dict | None) -> dict:
+    """EV-03: the settings panel's read-only look at the charger. `entities` is
+    Home Assistant's list by id (None: it did not answer). Nothing is written.
+    `{"ok", "found": [[role, entity]], "missing": [[role, entity]], "limit_a",
+    "state"}`; `state` is `off`, `no_name` (the setpoint is not named the way
+    the charger's integration names it), `unread`, `ok` or `missing`."""
+    if chargers.mode_of(opts) == chargers.OFF:
+        return {"ok": False, "found": [], "missing": [], "limit_a": None,
+                "state": "off"}
+    setpoint = str(opts.get("ev_current_entity") or "").strip()
+    if not chargers.entities_for(setpoint):
+        return {"ok": False, "found": [], "missing": [], "limit_a": None,
+                "state": "no_name" if setpoint else "empty"}
+    if entities is None:
+        return {"ok": False, "found": [], "missing": [], "limit_a": None,
+                "state": "unread"}
+    def state_obj(e):
+        row = entities.get(e)
+        return None if row is None else {
+            "state": row.get("state"),
+            "attributes": {"unit_of_measurement": row.get("unit")}}
+    pr = chargers.probe_from(setpoint, state_obj)
+    return {"ok": pr.ok, "found": [list(x) for x in pr.found],
+            "missing": [list(x) for x in pr.missing], "limit_a": pr.station_a,
+            "state": "ok" if pr.ok else "missing"}
+
+
+# The roles the "Found:" note names, in words (EV-03).
+_CHARGER_WORDS = (
+    ("state", "car state", "autostatus"), ("power", "power", "vermogen"),
+    ("energy", "energy", "energie"), ("readback", "read-back", "terugmelding"),
+    ("phases_read", "phases", "fasen"),
+    ("station", "the charger limit", "de laadpaalgrens"))
+
+
+def charger_probe_for(setpoint: str, entities: dict | None) -> dict:
+    """`charger_probe_rows()` for a setpoint entity typed on the page."""
+    return charger_probe_rows({"ev_charger": chargers.ALFEN_HA,
+                               "ev_current_entity": setpoint}, entities)
+
+
+def _charger_notes(notes, opts: dict, entities: dict) -> None:
+    """EV-03: a note for each charger entity Home Assistant does not have, and
+    one when the limit is above the charger's own. Never a refusal."""
+    look = charger_probe_rows(opts, entities)
+    key = ("ev_current_entity",)
+    if look["state"] == "no_name":
+        _advise(notes, "warn", key,
+                f"{S('ev_current_entity')} must be named like the Alfen "
+                "integration's current setting, so the charger is not read.",
+                nl=f"{SN('ev_current_entity')} moet heten zoals de "
+                "stroominstelling van de Alfen-integratie, dus de laadpaal "
+                "wordt niet gelezen.")
+        return
+    if look["state"] == "empty":
+        _advise(notes, "warn", key,
+                f"{S('ev_current_entity')} is empty, so the charger is not "
+                "read.",
+                nl=f"{SN('ev_current_entity')} is leeg, dus de laadpaal wordt "
+                "niet gelezen.")
+        return
+    if look["state"] not in ("ok", "missing"):
+        return
+    for role, entity in look["missing"]:
+        required = role in chargers.REQUIRED
+        _advise(notes, "warn" if required else "info", key,
+                f"Home Assistant has no entity {entity}, which the charger "
+                f"needs.",
+                nl=f"Home Assistant kent {entity} niet, die de laadpaal "
+                "nodig heeft.")
+    lim = look["limit_a"]
+    if look["ok"]:
+        have = {r for r, _e in look["found"]}
+        words = [(w_en, w_nl) for r, w_en, w_nl in _CHARGER_WORDS if r in have]
+        tail_en = f", {lim:.0f} A" if lim is not None else ""
+        _advise(notes, "ok", key,
+                "Found: " + ", ".join(w[0] for w in words) + tail_en + ".",
+                nl="Gevonden: " + ", ".join(w[1] for w in words) + tail_en
+                + ".")
+    amps = chargers.max_a(opts)
+    if lim is not None and amps is not None and amps > lim:
+        _advise(notes, "warn", ("ev_max_a",),
+                f"{S('ev_max_a')} is above the {lim:.0f} A the charger "
+                "reports, so lower it.",
+                nl=f"{SN('ev_max_a')} is hoger dan de {lim:.0f} A die de "
+                "laadpaal meldt, dus verlaag ze.")
+
+
 def _entity_notes(notes, opts: dict, entities: dict, bad=()) -> None:
     """A note for each entity these options read that Home Assistant does not
     have, or that reads in kW where watts are taken. A missing entity whose

goodwe_controller/app/web.py

@@ -51,7 +51,8 @@ from aiohttp import web
 from . import messages, price, selfconfig, uipage, uitext
 from .haentities import EntityCache
 from .homeview import priced_hours, region_of
-from .validate import config_notes, note_text, setup_checks
+from .validate import (charger_probe_for, config_notes, note_text,
+                       setup_checks)
 from .config_page import CONFIG_PAGE
 from .configui import (changed_keys, field_model, hide_secrets, keep_secrets,
                        problems_by_field, secret_keys)
@@ -474,6 +475,14 @@ def build_app(controller, selfcfg=None) -> web.Application:
             return web.json_response(await entities.reading(one))
         return web.json_response(await entities.payload(kind))
 
+    async def config_charger(request):
+        """EV-03: the settings page's read-only look at the car charger: which
+        entities Home Assistant has and which it lacks. Reads the cached entity
+        list and writes nothing, anywhere."""
+        rows, _age = await entities.get(max_age=5.0)
+        return web.json_response(charger_probe_for(
+            str(request.query.get("entity") or "")[:255], rows))
+
     app = web.Application()
     app.add_routes([
         web.get("/", index),
@@ -486,6 +495,7 @@ def build_app(controller, selfcfg=None) -> web.Application:
         web.post("/config/save", config_save),
         web.post("/config/restart", config_restart),
         web.get("/ha/entities", ha_entities),
+        web.get("/config/charger", config_charger),
     ])
     return app
 

goodwe_controller/config.yaml

@@ -872,6 +872,18 @@ options:
   # be reached by accident.
   shadow_mode: "auto"
 
+  # ==========================================================================
+  # CAR CHARGER - read only (EV-03)
+  # ==========================================================================
+  # `off` is the shipped value and means NO CHANGE AT ALL: nothing is read,
+  # shown or announced, and the House tile and the house profile are as before.
+  # `alfen_ha` reads the charger through its Home Assistant integration. THIS
+  # VERSION NEVER WRITES TO THE CHARGER; later cards add the modes.
+  ev_charger: "off"
+  ev_current_entity: ""
+  ev_max_a: 16
+  ev_phases: "auto"
+
   # ==========================================================================
   # ADVANCED - the control law and diagnostics
   # ==========================================================================
@@ -1249,6 +1261,17 @@ schema:
   # long as nobody notices.
   shadow_mode: list(auto|on|off)
 
+  # ==========================================================================
+  # CAR CHARGER - read only (EV-03)
+  # ==========================================================================
+  # `ev_current_entity` is the charger's current setpoint; the other entities
+  # are found from its name. `ev_max_a` may not exceed the charger's own station
+  # limit (the settings page and the start check read it).
+  ev_charger: list(off|alfen_ha)
+  ev_current_entity: str?
+  ev_max_a: int(6,40)
+  ev_phases: list(1|3|auto)
+
   # ==========================================================================
   # ADVANCED - the control law and diagnostics
   # ==========================================================================

goodwe_controller/test_peakguard.py

@@ -116,6 +116,7 @@ from math import inf, isinf
 from pathlib import Path
 
 from app import messages
+from app import ctl_cycle as _ctl_cycle
 from app import peakguard
 from named_absence import first, given, nth, present
 
@@ -2787,9 +2788,22 @@ def cycle_claims(run):
     return out, (seen[-1] if seen else [])
 
 
-def run_cycle(ctl):
-    asyncio.get_event_loop_policy().new_event_loop().run_until_complete(
-        ctl.cycle())
+def run_cycle(ctl, at=None):
+    """One `Controller.cycle()`. `at` pins the `now` that cycle() takes
+    (ctl_cycle.py:49) so a fixture laid up to `at` does not age with host load.
+    Other modules still read the real clock. CI-17."""
+    real_dt = _ctl_cycle.datetime
+    if at is not None:
+        class _Pinned(datetime):
+            @classmethod
+            def now(cls, tz=None):
+                return at if tz is None else at.astimezone(tz)
+        _ctl_cycle.datetime = _Pinned
+    try:
+        asyncio.get_event_loop_policy().new_event_loop().run_until_complete(
+            ctl.cycle())
+    finally:
+        _ctl_cycle.datetime = real_dt
     return ctl
 
 
@@ -2801,11 +2815,15 @@ def run_cycle(ctl):
 EVE_MEAN_W = sum(EVE_W) / len(EVE_W)
 c_src, _ = built(TMP / "sources.db")
 c_src.auto, c_src.batt, c_src.soc = True, 0.0, 100.0
+# CI-17: ONE read of the clock, and every cycle on c_src runs AT it. The
+# telegrams end here; `cycle()` used to read the real clock again, 1.3 s later
+# per cycle under --cpus 0.25, so by the 23rd cycle of the sweep the meter's
+# last telegram was older than `max_hold_s` (30 s), the guard counted the gap at
+# its ceiling and filed `peak@site` (ctl_cycle.py:49 -> p1.py max_hold_s).
+_SRC_NOW = datetime.now(timezone.utc)
 _blk_src = datetime.fromtimestamp(
-    int(datetime.now(timezone.utc).timestamp() // QUARTER_S) * QUARTER_S,
-    timezone.utc)
-for _i in range(0, int((datetime.now(timezone.utc)
-                        - _blk_src).total_seconds()) + 1, 5):
+    int(_SRC_NOW.timestamp() // QUARTER_S) * QUARTER_S, timezone.utc)
+for _i in range(0, int((_SRC_NOW - _blk_src).total_seconds()) + 1, 5):
     c_src.p1.submit(sample(_blk_src + timedelta(seconds=_i), EVE_MEAN_W))
 c_src.grid = EVE_MEAN_W
 
@@ -2817,7 +2835,7 @@ SRC_SWEEP = sorted({float(s) for s in range(0, 101, 5)}
 IDLE_SRC = {}
 for _soc in SRC_SWEEP:
     c_src.soc = _soc
-    _, _cl = cycle_claims(lambda: run_cycle(c_src))
+    _, _cl = cycle_claims(lambda: run_cycle(c_src, at=_SRC_NOW))
     IDLE_SRC[_soc] = frozenset(c.source for c in _cl)
 IDLE_SETS = set(IDLE_SRC.values())
 print(f"    a real idle cycle at {len(SRC_SWEEP)} states of charge "
@@ -3141,7 +3159,7 @@ _b2, _restore_b2 = second_inverter(c_src)
 _b2.bms_soc_floor = c_src.inverters[0].bms_soc_floor
 _n2_writes_before = len(c_src.hass.per_entity)
 try:
-    _, _cl2 = cycle_claims(lambda: run_cycle(c_src))
+    _, _cl2 = cycle_claims(lambda: run_cycle(c_src, at=_SRC_NOW))
     _n2_target, _n2_reason = c_src.target, c_src.reason
     _n2_events = list(c_src.events)
     _n2_writes = c_src.hass.per_entity[_n2_writes_before:]
@@ -3337,7 +3355,7 @@ check("...and the action log no longer carries the 'no writer' refusal, "
 _nw, _restore_nw = second_inverter(c_src, name="inverter-c", setpoint="")
 _nw_writes_before = len(c_src.hass.per_entity)
 try:
-    _, _cl_nw = cycle_claims(lambda: run_cycle(c_src))
+    _, _cl_nw = cycle_claims(lambda: run_cycle(c_src, at=_SRC_NOW))
     _nw_target, _nw_reason = c_src.target, c_src.reason
     _nw_events = list(c_src.events)
     _nw_writes = c_src.hass.per_entity[_nw_writes_before:]
@@ -3382,16 +3400,21 @@ check("...and the 0 W is NOT what the site target happened to be - the same "
 # method is asked, which is what makes this a check on `live_units()` instead of
 # a check on a lambda this file wrote.
 _bs, _restore_bs = second_inverter(c_src)
-_bs.rejected_since = datetime.now(timezone.utc) - timedelta(
-    seconds=app_main.LINK_STALE_S + 5)
+# CI-17: from `_SRC_NOW`, the instant the pinned cycles run at; the real clock
+# is later, so `live_units()` (real clock) and the cycle (pinned) agree.
+_bs.rejected_since = _SRC_NOW - timedelta(seconds=app_main.LINK_STALE_S + 5)
 _bs.last_write_ok = False
 _stale_writes_before = len(c_src.hass.per_entity)
 try:
+    check("CI-17: the pinned clock and the real clock agree that inverter B's "
+          "link is stale, so the cycle and `live_units()` see the same roster",
+          not _bs.is_live(_SRC_NOW)[0]
+          and not _bs.is_live(datetime.now(timezone.utc))[0])
     check("PRECONDITION: the SHIPPED `live_units()` - not a lambda - drops the "
           "inverter whose writes have been rejected for a whole layer-1 window, "
           "and keeps the healthy one",
           c_src.live_units() == ("inverter-a",))
-    _, _cl_stale = cycle_claims(lambda: run_cycle(c_src))
+    _, _cl_stale = cycle_claims(lambda: run_cycle(c_src, at=_SRC_NOW))
     _stale_target = c_src.target
     _stale_alloc = c_src.allocation
     _stale_events = list(c_src.events)
@@ -3433,14 +3456,13 @@ check("⚠️ AND IT DOES NOT ABSORB IT SILENTLY, which is the whole of AC 6 and
 # state `live_units()`'s own docstring warns about - the sole inverter dropping
 # takes the SITE to 0 W - so it is driven here rather than left as a sentence.
 _bd, _restore_bd = second_inverter(c_src)
-_gone = datetime.now(timezone.utc) - timedelta(
-    seconds=app_main.LINK_STALE_S + 5)
+_gone = _SRC_NOW - timedelta(seconds=app_main.LINK_STALE_S + 5)  # CI-17: as above
 _bd.rejected_since, _bd.last_write_ok = _gone, False
 c_src.inverters[0].rejected_since = _gone
 c_src.inverters[0].last_write_ok = False
 _dead_writes_before = len(c_src.hass.per_entity)
 try:
-    _, _cl_dead = cycle_claims(lambda: run_cycle(c_src))
+    _, _cl_dead = cycle_claims(lambda: run_cycle(c_src, at=_SRC_NOW))
     _dead_target, _dead_reason = c_src.target, c_src.reason
     _dead_alloc = c_src.allocation
     _dead_events = list(c_src.events)

goodwe_controller/test_selfconfig.py

@@ -637,9 +637,10 @@ _routes = sorted({(r.method, r.get_info().get("path"))
                   for r in _app.router.routes() if r.method != "HEAD"})
 print("    " + "  ".join(f"{m} {p}" for m, p in _routes))
 check("the configuration surface adds five routes, UX-13 one GET and "
-      "UX-54 one more GET (the Forecast tab), and none touches the three "
+      "UX-54 one more GET (the Forecast tab), EV-03 one read-only GET (the car "
+      "charger probe), and none touches the three "
       "that were there",
-      _routes == [("GET", "/"), ("GET", "/config"), ("GET", "/config/model"),
+      _routes == [("GET", "/"), ("GET", "/config"), ("GET", "/config/charger"), ("GET", "/config/model"),
                   ("GET", "/forecast"), ("GET", "/ha/entities"),
                   ("GET", "/status"),
                   ("POST", "/action"), ("POST", "/config/restart"),

goodwe_controller/test_settings.py

@@ -80,12 +80,13 @@ for _g in LAYOUT["groups"]:
             _flat += [(_g["id"], _s) for _s in _f.get("fields", [])]
 _keys = [f["key"] for _g, f in _flat]
 FIELD = {f["key"]: f for _g, f in _flat}
-check("the six groups, in the design's order",
+check("the seven groups, in the design's order",
       [g["id"] for g in LAYOUT["groups"]]
-      == ["meter", "inverters", "tariff", "safety", "maintenance", "tuning"]
+      == ["meter", "inverters", "tariff", "safety", "car", "maintenance",
+          "tuning"]
       and [g["name"] for g in LAYOUT["groups"]]
       == ["Meter", "Inverters and batteries", "Tariff and prices",
-          "Safety limits", "Maintenance", "Control tuning"])
+          "Safety limits", "Car charger", "Maintenance", "Control tuning"])
 check(f"every field of the table is on the page once ({len(_keys)} fields)",
       sorted(_keys) == sorted(f.key for _g, _p, f in L.fields())
       and len(_keys) == len(set(_keys)))
@@ -146,7 +147,7 @@ check("a page-only field names the option keys it writes, for the grey key "
       == ["pv_entities", "pv_entity", "pv_invert_entities"]
       and "static_profile" in field(FIELD, "ui.contract")["writes"])
 check("without a Supervisor schema the page still draws, with no ranges",
-      len(uipage.layout([], {})["groups"]) == 6)
+      len(uipage.layout([], {})["groups"]) == 7)
 
 # --------------------------------------------------------------------------- #
 print("\n2. the page script names no option key")

goodwe_controller/test_translations.py

@@ -205,10 +205,11 @@ print("\n4. task ordering, and the labels that carry it")
 # prefixes appear in the file as CONTIGUOUS RUNS in the task order. A group
 # whose members are scattered renders as a jumble however good each label is.
 GROUPS = ["Hardware", "Meter", "Limits", "Tariff", "Maintenance", "Safety",
-          "Advanced"]
+          "Car charger", "Advanced"]
 NL_GROUPS = {"Hardware": "Hardware", "Meter": "Meter", "Limits": "Grenzen",
              "Tariff": "Tarief", "Maintenance": "Onderhoud",
-             "Safety": "Veiligheid", "Advanced": "Geavanceerd"}
+             "Safety": "Veiligheid", "Car charger": "Laadpaal",
+             "Advanced": "Geavanceerd"}
 _prefixes = []
 for key in ORDER:
     name = TR["en"]["configuration"][key]["name"]

goodwe_controller/tools/chargersim.py

@@ -0,0 +1,268 @@
+#!/usr/bin/env python3
+"""EV-03: a model of an Alfen car charger behind Home Assistant, for the unit
+tests and, later, for TEST-23.
+
+WHERE IT LIVES, AND WHY. The rig's hardware sims (`hwsim.py`, `plantsim.py`) are
+in the infra repo admin/goodwe under `sim/`, pinned by `.gitea/infra-pin`; there
+is no `sim/` in this repository. This card may write only to this repository, so
+the model sits beside the add-on's other tools. Moving it next to `hwsim.py` is a
+copy: it imports nothing from the add-on.
+
+WHAT IT MODELS (every entity the add-on's Alfen driver reads, with the names and
+units the leeyuentuen/alfen_wallbox integration gives, from the owner's export):
+
+  * mode3 state A (no car), B (connected, not charging), C (charging)
+  * power that RAMPS to what the car takes (`RAMP_W_S`), 1 or 3 phases
+  * the current setpoint, its read-back, the station limit (16 A at the owner's)
+  * a full car (it stops by itself: state B with the current still allowed)
+  * the integration going unavailable, and the login sensor off
+
+    from chargersim import SimCharger, FakeHa
+    c = SimCharger("wallbox"); c.plug_in(); c.set_current(10); c.tick(30)
+    ha = FakeHa(c)                       # a Home Assistant that serves its states
+
+`FakeHa` has the methods the add-on calls (`state`, `number`, `states`,
+`set_number`, `call`) and RECORDS every write, so a test can prove none happened.
+`python3 chargersim.py --selftest` runs the model's own checks. `serve(port)`
+answers the REST calls the add-on makes (`GET /api/states[/<id>]`), for a rig.
+"""
+
+import json
+import sys
+
+VOLTS = 230.0
+RAMP_W_S = 3000.0           # how fast the power follows its target
+MIN_A = 6.0
+
+
+class SimCharger:
+    def __init__(self, name="wallbox", station_a=16.0, setpoint_a=10.0,
+                 phases_allowed=1, kwh=4004.85):
+        self.x = name
+        self.station_a = float(station_a)
+        self.setpoint_a = float(setpoint_a)
+        self.readback_a = float(setpoint_a)
+        self.phases_allowed = phases_allowed
+        self.car_phases = 3           # what the car can use
+        self.state = "A"
+        self.full = False
+        self.power_w = 0.0
+        self.kwh = float(kwh)
+        self.unavailable = False
+        self.login_on = True
+        self.error = "0: No Error"
+
+    # -- the world acts on it -------------------------------------------------
+    def plug_in(self, car_phases=3):
+        self.car_phases = car_phases
+        self.full = False
+        self.state = "B"
+
+    def unplug(self):
+        self.state, self.power_w = "A", 0.0
+
+    def car_full(self):
+        self.full = True
+
+    def set_current(self, a):
+        """What an automation (or, later, this add-on) does to the setpoint."""
+        a = max(0.0, min(float(a), self.station_a))
+        self.setpoint_a = self.readback_a = a
+
+    def set_phases(self, n):
+        self.phases_allowed = 3 if n == 3 else 1
+
+    def fault(self, letter="E"):
+        """mode3 E or F: the charger's own error states."""
+        self.state, self.power_w = letter, 0.0
+
+    def go_unavailable(self, on=True):
+        self.unavailable = bool(on)
+
+    def login(self, on=True):
+        self.login_on = bool(on)
+
+    # -- time -----------------------------------------------------------------
+    @property
+    def phases_used(self):
+        return min(self.car_phases, self.phases_allowed)
+
+    def target_w(self):
+        if self.state == "A" or self.full or self.setpoint_a < MIN_A:
+            return 0.0
+        return self.setpoint_a * VOLTS * self.phases_used
+
+    def tick(self, seconds=1.0):
+        for _ in range(int(max(1, round(seconds)))):
+            if self.state in ("E", "F"):      # a fault: nothing flows, it stays
+                self.power_w = 0.0
+                continue
+            if self.state != "A":
+                self.state = "C" if self.target_w() > 0 else "B"
+            tgt = self.target_w()
+            step = RAMP_W_S
+            if self.power_w < tgt:
+                self.power_w = min(tgt, self.power_w + step)
+            else:
+                self.power_w = max(tgt, self.power_w - step)
+            self.kwh += self.power_w / 3.6e6
+
+    # -- what Home Assistant would serve ---------------------------------------
+    def _amps(self):
+        per = (self.power_w / (VOLTS * self.phases_used)
+               if self.phases_used and self.power_w else 0.0)
+        return [per if i < self.phases_used else 0.0 for i in range(3)]
+
+    def states(self) -> dict:
+        x = self.x
+        bad = "unavailable" if self.unavailable else None
+
+        def st(eid, value, unit=None, **attrs):
+            a = dict(attrs)
+            if unit:
+                a["unit_of_measurement"] = unit
+            return eid, {"entity_id": eid,
+                         "state": bad or str(value), "attributes": a}
+        amps = self._amps()
+        rows = [
+            st(f"number.{x}_power_connector_max_current_socket_1",
+               f"{self.setpoint_a:g}", "A", min=0, max=40, step=1),
+            st(f"sensor.{x}_main_active_max_current_socket_1",
+               f"{self.readback_a:g}", "A"),
+            st(f"sensor.{x}_mode3_state_socket_1", f"STATE_{self.state}"),
+            st(f"sensor.{x}_display_state_socket_1",
+               {"A": "Available", "B": "EV Connected",
+                "C": "Charging Normal"}.get(self.state, "Error")),
+            st(f"sensor.{x}_active_power_total_socket_1",
+               f"{self.power_w:.0f}", "W"),
+            st(f"sensor.{x}_meter_reading_socket_1", f"{self.kwh:.2f}",
+               "kWh"),
+            st(f"sensor.{x}_current_l1_socket_1", f"{amps[0]:.1f}", "A"),
+            st(f"sensor.{x}_current_l2_socket_1", f"{amps[1]:.1f}", "A"),
+            st(f"sensor.{x}_current_l3_socket_1", f"{amps[2]:.1f}", "A"),
+            st(f"number.{x}_max_station_current", f"{self.station_a:g}", "A"),
+            st(f"sensor.{x}_main_station_active_max_current_socket_1",
+               f"{self.station_a:g}", "A"),
+            st(f"select.{x}_installation_max_allowed_phases",
+               "3 Phases" if self.phases_allowed == 3 else "1 Phase"),
+            st(f"sensor.{x}_connector_1_max_allowed_of_phases",
+               "3 Phases" if self.phases_allowed == 3 else "1 Phase"),
+            st(f"sensor.{x}_display_error_number_socket_1", self.error),
+            (f"binary_sensor.{x}_https_api_login_status",
+             {"entity_id": f"binary_sensor.{x}_https_api_login_status",
+              "state": bad or ("on" if self.login_on else "off"),
+              "attributes": {"device_class": "connectivity"}}),
+        ]
+        return dict(rows)
+
+
+class FakeHa:
+    """A Home Assistant that serves a `SimCharger` (and any `extra` states) and
+    records every service call and number write it is given."""
+
+    session = None
+    token = ""
+    read_only = False
+
+    def __init__(self, charger=None, extra=None):
+        self.charger = charger
+        self.extra = dict(extra or {})
+        self.calls = []             # (domain, service, data)
+        self.sets = []              # (entity, value)
+
+    def _all(self):
+        out = dict(self.extra)
+        if self.charger is not None:
+            out.update(self.charger.states())
+        return out
+
+    async def state(self, entity_id):
+        return self._all().get(entity_id)
+
+    async def states(self):
+        return list(self._all().values())
+
+    async def number(self, entity_id, invert=False):
+        s = self._all().get(entity_id)
+        try:
+            v = float(s["state"])
+        except (TypeError, ValueError, KeyError):
+            return None
+        return -v if invert else v
+
+    async def limits(self, _entity_id):
+        return (-5000.0, 5000.0, 1.0)
+
+    async def set_number(self, entity_id, value):
+        self.sets.append((entity_id, value))
+        return True
+
+    async def call(self, domain, service, data=None):
+        self.calls.append((domain, service, data))
+        return True
+
+    def charger_writes(self):
+        """Every write or service call that names a charger entity."""
+        x = self.charger.x if self.charger else "\0"
+        hits = [s for s in self.sets if x in s[0]]
+        hits += [c for c in self.calls if x in json.dumps(c[2] or {})]
+        return hits
+
+
+def serve(sim, port=8123):
+    """Answer `GET /api/states` and `GET /api/states/<id>` from `sim`, for a
+    rig. Reads only: any POST answers 405, so nothing can write the model."""
+    import http.server
+
+    class H(http.server.BaseHTTPRequestHandler):
+        def do_GET(self):
+            rows = sim.states()
+            path = self.path.split("?")[0].rstrip("/")
+            if path.endswith("/api/states"):
+                body = list(rows.values())
+            else:
+                body = rows.get(path.rsplit("/api/states/", 1)[-1])
+            self.send_response(200 if body is not None else 404)
+            self.send_header("Content-Type", "application/json")
+            self.end_headers()
+            self.wfile.write(json.dumps(body).encode())
+
+        def do_POST(self):
+            self.send_response(405)
+            self.end_headers()
+
+        def log_message(self, *_a):
+            pass
+
+    srv = http.server.ThreadingHTTPServer(("0.0.0.0", port), H)
+    return srv
+
+
+def _selftest():
+    c = SimCharger()
+    assert c.states()[f"sensor.wallbox_mode3_state_socket_1"]["state"] == "STATE_A"
+    c.plug_in(); c.tick(1)
+    assert c.state == "B" or c.state == "C"
+    c.set_current(10); c.set_phases(3); c.tick(5)
+    assert c.state == "C" and abs(c.power_w - 10 * 230 * 3) < 1, c.power_w
+    c.set_phases(1); c.tick(5)
+    assert abs(c.power_w - 2300) < 1
+    c.set_current(5); c.tick(5)
+    assert c.state == "B" and c.power_w == 0       # under 6 A: paused
+    c.set_current(10); c.car_full(); c.tick(5)
+    assert c.state == "B" and c.power_w == 0 and c.readback_a == 10
+    c.go_unavailable()
+    assert c.states()[f"sensor.wallbox_active_power_total_socket_1"]["state"] \
+        == "unavailable"
+    c.go_unavailable(False); c.login(False)
+    assert c.states()["binary_sensor.wallbox_https_api_login_status"]["state"] == "off"
+    print("chargersim selftest ok")
+
+
+if __name__ == "__main__":
+    if "--selftest" in sys.argv:
+        _selftest()
+    else:
+        srv = serve(SimCharger(), int(sys.argv[1]) if len(sys.argv) > 1 else 8123)
+        print("serving the charger model, GET only; Ctrl-C stops it")
+        srv.serve_forever()

goodwe_controller/tools/ux13_demo.py

@@ -36,7 +36,7 @@ sys.path.insert(0, os.path.join(HERE, "tools"))
 
 from aiohttp import web as aioweb                                # noqa: E402
 
-from app import homeview, packmode, web                          # noqa: E402
+from app import chargers, freshness, homeview, packmode, web     # noqa: E402
 from app.main import Controller                                  # noqa: E402
 from app.maintenance import DRAIN                                # noqa: E402
 from app.setuponly import SetupOnly                              # noqa: E402
@@ -44,6 +44,7 @@ from app.peakguard import PeakDecision                           # noqa: E402
 from app.price import PricePoint, PriceProduct, PriceRead        # noqa: E402
 from app.static_tariff import TariffPlan                         # noqa: E402
 import translations_lint as TL                                   # noqa: E402
+from chargersim import SimCharger                                # noqa: E402
 
 PRICES = [.24, .22, .21, .20, .21, .22, .24, .27, .26, .22, .18, .16, .15,
           .14, .16, .19, .23, .28, .33, .36, .34, .29, .26, .24]
@@ -104,6 +105,61 @@ class Hass:
         return STATES
 
 
+# EV-03: the car states. A charger model behind the demo's Home Assistant; the
+# real `Controller._read_charger()` reads it, so the card is what the add-on
+# draws, not a picture.
+CAR_STATES = ("car", "car_none", "car_waiting", "car_full", "car_unreach",
+              "car_setup")
+CAR_ENTITY = "number.wallbox_power_connector_max_current_socket_1"
+SIM = SimCharger()
+
+
+class CarHass(Hass):
+    async def state(self, e):
+        return SIM.states().get(e) or await super().state(e)
+
+    async def states(self):
+        return list(STATES) + list(SIM.states().values())
+
+
+def car_setup(state):
+    """Put the model in the state's situation."""
+    global SIM
+    SIM = SimCharger(name="other" if state == "car_setup" else "wallbox")
+    if state in ("car", "car_unreach"):
+        SIM.plug_in()
+        SIM.set_phases(3)
+        SIM.set_current(16)
+    elif state == "car_waiting":
+        SIM.plug_in()
+        SIM.set_current(0)
+    elif state == "car_full":
+        SIM.plug_in()
+        SIM.set_current(10)
+        SIM.car_full()
+    SIM.tick(12)
+
+
+async def car_feed(c, state):
+    """The cycle's own read, once a second, like the control loop."""
+    backdated = False
+    n = 0
+    while True:
+        n += 1
+        if state == "car_unreach" and n == 4:
+            SIM.go_unavailable()
+        SIM.tick(1)
+        await c._read_charger(freshness.monotonic())
+        if state == "car_unreach" and c.car.bad_since is not None \
+                and not backdated:
+            backdated = True        # 12 minutes in, so the row and the note show
+            c.car.bad_since -= 720.0
+            c.car.bad_since_utc -= timedelta(seconds=720)
+        if state == "car_full" and c.car.b_since is not None and n < 3:
+            c.car.b_since -= 120.0  # the full dwell has passed
+        await asyncio.sleep(1.0)
+
+
 KETTLE_READS = (-10, 1990, 1990, -10)
 KETTLE_COUNT = [0]
 
@@ -244,7 +300,13 @@ def controller(state):
     opts = dict(OPTS, shadow_mode="on" if state == "shadow" else "off")
     if state in P3:
         opts["battery_modes_enabled"] = True
-    c = Controller(opts, Hass(), Store(), Pub(), stop=asyncio.Event())
+    hass = Hass()
+    if state in CAR_STATES:
+        car_setup(state)
+        opts.update(ev_charger="alfen_ha", ev_current_entity=CAR_ENTITY,
+                    ev_max_a=16, ev_phases="auto")
+        hass = CarHass()
+    c = Controller(opts, hass, Store(), Pub(), stop=asyncio.Event())
     c.auto = True
     now = datetime.now(timezone.utc)
     day0, _day1 = homeview.local_day(now)
@@ -264,6 +326,12 @@ def controller(state):
             inv.last_write = 0.0
     c.grid = -10.0 if state != "shadow" else -2810.0
     c.pv_w = 3900.0
+    if state in CAR_STATES:
+        # 11 kW to the car on top of a 1.6 kW house, all from the roof
+        c.grid, c.pv_w = 0.0, (12600.0 if state == "car" else 2400.0)
+        for inv in c.inverters:
+            inv.batt = 0.0
+        c.car.stale_s = 15.0
     if state == "alarm":
         c.inverters[0].sign_wd.tripped = True
     if state in P3:
@@ -327,9 +395,17 @@ async def main(state, port, host="127.0.0.1"):
                   battery_modes_enabled=state in P3,
                   inverters=[dict(i, bms_soc_floor=10)
                              for i in OPTS["inverters"]])
-    runner = aioweb.AppRunner(web.build_app(c, Supervisor(stored)))
+    stored.update(ev_charger=c.o.get("ev_charger", "off"),
+                  ev_current_entity=c.o.get("ev_current_entity", ""),
+                  ev_max_a=c.o.get("ev_max_a", 16),
+                  ev_phases=c.o.get("ev_phases", "auto"))
+    app = web.build_app(c, Supervisor(stored))
+    runner = aioweb.AppRunner(app)
     await runner.setup()
     await aioweb.TCPSite(runner, host, port).start()
+    if state in CAR_STATES:
+        asyncio.get_running_loop().create_task(car_feed(c, state))
+        main.app = app
     print(f"serving {state} on http://127.0.0.1:{port}/", flush=True)
     await asyncio.Event().wait()
 

goodwe_controller/translations/en.yaml

@@ -283,6 +283,18 @@ configuration:
   shadow_mode:
     name: "Safety · Shadow mode"
     description: "The add-on makes every decision but keeps every inverter at 0 W. 'auto' does this while control is stopped, 'on' always, 'off' never."
+  ev_charger:
+    name: "Car charger · Charger"
+    description: "Which car charger the add-on reads. Off leaves everything as it is. This version only reads the charger and never changes it."
+  ev_current_entity:
+    name: "Car charger · Current setting entity"
+    description: "The entity that sets the charger's current. The add-on finds the charger's other entities from its name."
+  ev_max_a:
+    name: "Car charger · Charger limit (A)"
+    description: "The most current the charger may ever be asked for. Never above what the charger reports. Lower it for a weaker fuse or cable."
+  ev_phases:
+    name: "Car charger · Phases"
+    description: "How many phases the charger may use: 1, 3, or 1 and 3 (auto)."
   auto_start:
     name: "Advanced · Start control on boot"
     description: "Off by default. Leave it off until the site is commissioned, so someone presses Start after each restart."

goodwe_controller/translations/nl.yaml

@@ -264,6 +264,18 @@ configuration:
   shadow_mode:
     name: "Veiligheid · Schaduwmodus"
     description: "De add-on neemt elke beslissing maar houdt elke omvormer op 0 W. 'auto' doet dit zolang de regeling gestopt is, 'on' altijd, 'off' nooit."
+  ev_charger:
+    name: "Laadpaal · Laadpaal"
+    description: "Welke laadpaal de add-on leest. Uit laat alles zoals het is. Deze versie leest de laadpaal alleen en wijzigt niets."
+  ev_current_entity:
+    name: "Laadpaal · Entiteit van de laadstroom"
+    description: "De entiteit die de stroom van de laadpaal instelt. De add-on vindt de andere entiteiten van de laadpaal via de naam."
+  ev_max_a:
+    name: "Laadpaal · Laadpaalgrens (A)"
+    description: "De hoogste stroom die aan de laadpaal gevraagd mag worden. Nooit hoger dan wat de laadpaal meldt. Verlaag ze voor een zwakkere zekering of kabel."
+  ev_phases:
+    name: "Laadpaal · Fasen"
+    description: "Hoeveel fasen de laadpaal mag gebruiken: 1, 3, of 1 en 3 (auto)."
   auto_start:
     name: "Geavanceerd · Regeling starten bij opstarten"
     description: "Staat standaard uit. Laat het uit tot de installatie in dienst is, zodat iemand na elke herstart op Start drukt."