glenn schrooyenandClaude Opus 5
d0b053b150
max_w and the LIVE_MAX_W literal beside it were the two survivors left
after TEST-06 pinned meter_freeze_s: changing max_w 2000 -> 4500 in
config.yaml passed every check in test_freeze.py and test_tariff.py
GREEN, and LIVE_MAX_W = 5000.0 was a bare literal that silently
disagreed with the shipped max_w (2000) with nothing in the file
saying so. For contrast, deadband_w 15 -> 5 already went RED 2 + 1,
so the pinning technique was known to work - it just was not applied
to the key either side of it.
Three changes, each measured:
1. test_freeze.py gains a check comparing Tuning()'s code default
(control.py, 2000.0) against SHIPPED_MAX_W, read from config.yaml
by extending the file's existing _cfg_default() regex reader
rather than reimplementing test_arbitrage.py's _shipped. Broken
and confirmed red: max_w: 2000 -> 4500 in config.yaml now fails
exactly "the code default and the shipped default agree on max_w
too" and nothing else in either file; reverting returns both files
to all-green. (AC 1, AC 4)
2. LIVE_MAX_W is renamed LIVE_INSTALL_MAX_W in both test_freeze.py
and test_tariff.py, each with a comment stating plainly that 5000
is the live install's own override, not config.yaml's shipped
max_w (2000) - the defect was a literal that could be misread as
the shipped default, not the number itself. (AC 2)
3. test_freeze.py states PINNED_KEYS = ("meter_freeze_s", "deadband_w",
"max_w") in one place as the complete set of config keys this
suite pins. Deliberately excludes maintenance_* - CFG-03 (merged
into release/1.0 since this branch started, merged in here) gave
those keys a separate single source of truth in app/maintenance.py
and this ticket has no reason to duplicate that pin. Not every key
in config.yaml is pinned here on purpose: meter_freeze_s,
deadband_w and max_w are the three this file's mutual-exclusion
arithmetic (section 2b) actually reasons about together. (AC 3)
Full 17-file suite run green under goodwe-addon-ci after the merge
with release/1.0 (f630ed9, CFG-03). CHANGELOG.md updated under
Unreleased.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
GoodWe RS485 Controller — Home Assistant add-on repository
Replaces a GoodWe battery inverter's vendor controller with a local one: holds net grid exchange at zero by emulating the inverter's smart meter over RS485, and runs the monthly battery maintenance cycle the vendor box was doing.
repository.yaml add-on repository metadata
goodwe_controller/ the add-on
config.yaml manifest + options schema (the per-site config form)
app/ the controller
control.py the control law — pure functions, no I/O
maintenance.py the monthly cycle state machine
hass.py Supervisor/Core API access
store.py persistent state in /data
mqtt.py optional status entities
web.py ingress UI
main.py orchestration, heartbeat, failsafe behaviour
test_control.py runnable checks — no framework needed
test_maintenance.py runnable checks — walks a full cycle in fake time
DOCS.md the add-on's documentation tab
MUTATION.md how to run a mutation so the result means something
tools/mutation_run.sh the mutation harness - purges bytecode, then grades
firmware/goodwe-master.yaml ESPHome config for the T-CAN485
estop/rs485_log.py optional RS485 e-stop / bus witness
docs/GoodWe-RS485-Field-Guide.pdf the guide techs carry (10pp, A4)
docs/build_guide.py its single source - rebuilds the HTML and PDF
FIELD-GUIDE.md how to edit and rebuild the guide
Picking this up after a break? Read HANDOVER.md first — current state,
what is known broken, and what to do next.
Install
Settings → Add-ons → Add-on store → ⋮ → Repositories → add
https://gittea.kammenstraatha.duckdns.org/admin/goodwe-addon
then install GoodWe RS485 Controller.
⚠️ The repository must be PUBLIC for this to work. Home Assistant clones it
anonymously; against a private repo the store shows nothing and gives no useful
error. If it must stay private, install locally instead: copy
goodwe_controller/ into the machine's /addons/ folder, then
ha store reload — it appears as a Local add-on.
⚠️ Bump version: in goodwe_controller/config.yaml for every change.
Supervisor keys the built image by that version, so without a bump it silently
reuses the old image and your fix appears not to work — on your bench and on
every client's machine.
Requires Home Assistant OS or Supervised. Add-ons cannot be installed on HA Container or Core.
Read this first
The inverter holds its last command forever. It has no meter-timeout of its own — a controller that dies mid-command leaves the battery running until a human intervenes. Measured on real hardware: 5 kW of discharge held for 113 seconds after a controller went silent.
Three layers exist because of that, and only the third covers the Home Assistant machine itself dying:
- ESP32 watchdog — no fresh setpoint for ~30 s → command 0 W, and keep commanding it.
- Wind-down before firmware updates — 0 W written before the update starts.
- RS485 e-stop (optional) — writes 0 W after 30 s of total bus silence.
Sites sold without the e-stop must have the acknowledgement in FIELD-GUIDE.md
§10 signed.
Development
The control law and the maintenance machine are pure Python with no Home Assistant imports, so they run anywhere:
cd goodwe_controller
python3 test_control.py
python3 test_maintenance.py
Both must pass before shipping any change. To prove a check bites - the way
almost every claim in this repository was established - mutate the module and
run tools/mutation_run.sh, which clears __pycache__ first. It is not
optional: a same-size edit reverted inside one second leaves CPython reusing the
old bytecode, and the run grades code that is not there. goodwe_controller/MUTATION.md
has the mechanism, the measurement, and what the flags do not do. They are not unit-test theatre —
each assertion corresponds to a rule whose absence produced an observed failure
on real hardware, and the comments in control.py say which.
Compatibility
Check the serial number, not the model name. Characters 6-8 of the serial are the platform tag:
| tag | platform | verdict |
|---|---|---|
ESU EMU ESA BPS BPU EMJ IJL |
105 — ES/EM/BP, AA55-era meter bus | supported |
SPB SPN |
745 — SBP G2 (GW…-SBP-20) |
no |
ESN ESC |
745 — ES G2 (GW…-ES-20) |
no |
ETU EHU BTU … |
205/745/753 — ET/EH/BT hybrids | no |
SDT DST MSU NSU … |
PV-only inverters — no battery to control | no |
A "-20" or "G2" suffix means a different platform with a different meter
protocol. The tags come from the goodwe library's PLATFORM_105_MODELS, which
is also what Home Assistant's own integration uses to pick a protocol.
- GoodWe ES / BP family inverters (AA55 / RS485 meter-bus generation)
- The protocol is reverse-engineered. There is no vendor contract, and a firmware change on GoodWe's side could break every installation at once. Say so when you sell it.