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Four places where the add-on's account of itself was wrong, every one in the direction that flatters it, and none of them pinned by any check because nothing graded the strings a human reads. TariffPlan.words counted points and called them hours - 192 h for 192 quarter-hourly points, which is 48 hours; measured across a 40-hour soak the error ranged 1.79x to 5.33x with the firm/carried mix, and horizon_h was 48.0 at every sample while words never said 48. The section 8.3 refusal did the same and reached the status page through arb.explain(): 'only 1 of 96 hours carry a published price' for 96 points spanning 24. The plan's shape reached no HTTP surface at all - rows['Tariff'] was static_status()'s own sentence and read 'no static profile' at all 802 soak samples, while the plan was provisional for 76% of them and carried mixed 900/3600 s spacing for 70%. And main.py's 'if and only if' comment was false: cycle() returns on missing inputs before self.arb = None, so a site with trading ON rendered 'off (arbitrage_enabled)' - naming an option that was on. A FIFTH instance was found that the card did not list, in price_forecast.py's '%d of %d hours' - carried hours over points - which DOCS quotes verbatim, so leaving it would have re-broken the doc. THE CHECK IS THE DELIVERABLE, not the fixes. It renders Controller.status_payload()['rows'], parses each number out of its OWN slot, and compares it against a figure computed from the fixture's two construction parameters - never from the property the row was built out of. The slot parser is calibrated first against a correct row AND against a row wrong exactly as the defect was. Fixtures are a SET of four plan shapes and the check computes and prints the table of field pairs no fixture separates. origin and product are graded by disagreement over identical point lists, the Arbitrage row's states by inequality, the end-to-end row against the captured document's own length. The two Tariff sources stay distinguishable: one row, two explicitly timestamped halves, with the age taken from tariff_at - which TARIFF-12 deliberately does not move on a kept plan - and measured by the caller rather than by a second clock inside the renderer. The same plan object at 0 s and 4000 s must render differently, and hardcoding the age to 0 is red. FCST-04's Tariff-to-DOCS pin was honoured rather than routed around: wiring the plan in took test_price_history.py red until DOCS carried the pinned sentence, the row's five facts, the two-clock warning and a four-row table of the Arbitrage renderings. The trap fired exactly as designed. Evidence: 29/29 green, re-verified after merging TARIFF-13. Sixteen mutations, no survivors; one is a zero-byte edit transposing firm and carried, and it is red. TWO MUTATIONS BIT THE AGENT'S OWN CHECKS AND BOTH WERE CLOSED. One was a survivor of the whole suite at -190 B: the origin fixture gave the fallback plan a distinct provider string as well as a distinct origin, so the rows differed for two reasons and dropping origin entirely changed nothing observable - habit 4, occurring inside the fix for habit 4. The provider string is now held equal as its own precondition. The other produced a traceback and no named red, because a datetime comparison raised inside an f-string OPERAND rather than inside the condition - FCST-06's finding, one layer over. Left for its own card, named rather than folded in: TARIFF-09's price_feed_url override warning still predicts the wrong degraded state - on a cold store the unpublished hours are ABSENT, not carried and flagged - and absence is the worse state.
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 — routes only, status and configuration
config_page.py the configuration page's markup, style and script
configui.py its field model, built from the Supervisor's own
schema + translations — owns no key, label or rule
selfconfig.py reading and writing this add-on's own options,
with the validate-first / compare-and-swap gate
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
tools/supervisor_selfapi_probe.py what the Supervisor really permits and
returns, run against its own release image
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.