glenn schrooyenandClaude Opus 5
0942228d65
Two conflicts, both predicted, both mine as the later merger. app/main.py - #12 inserted `await self.check_output_clamp()` on the line immediately above `await self.check_meter_frozen()`, so its hunk abuts my comment correction. Resolved so EACH CALL CARRIES ITS OWN BOUNDARY, because the two guards do not share one: - check_output_clamp() reads `self.clamp_last`, which is None until write_setpoint() has run, so its boundary IS the write; - check_meter_frozen() grades `self.target`, assigned further up, so its boundary is the assignment. Letting my correction generalise across both would have been worse than the vague comment it replaces, because it would read as deliberate. The AST of app/main.py is identical to merged release/1.0 (+1251 bytes, all comment). test_freeze.py - #12 independently added `frozen_notes()` keyed on the same id. `notes_of()` subsumes it: same id, plus the title fallback that keeps the id's own check independently falsifiable, plus `all_notes_of()` for claims about the whole surface. THE THREE SURFACE-WIDE ASSERTIONS, DECIDED ONE AT A TIME. Measured on the merged tree: scenario surface ids freeze frozen meter, railed command 2 frozen + clamp 1 TEL-05 converged, -14.2 W 0 - 0 moving meter, a real 8 kW load 1 clamp 0 uncovered transport, no unchanged_s 1 clamp 0 - the wiring scenario STAYS SURFACE-WIDE and now asserts exactly TWO alarms with BOTH IDS NAMED. The answer to "is this still meant to raise one alarm" is no, it raises two, and a third guard has to come back to this line. That is the one assertion in the file that accounts for the controller's entire alarm output; - the CONVERGED case stays surface-wide and stays silent: at the operating point the whole add-on should have nothing to say, that is still true, and narrowing it would give away a real property; - the other two NARROW to notes_of(). The clamp alarm there is correct and is SAFETY-03's subject: a real 8 kW load does drive the loop past the rating, and an uncovered transport does not stop it. Asserting whole-surface silence would make this file fail whenever another guard correctly does its job. Each still owns the load-bearing half - THE FREEZE DETECTOR SAID NOTHING - and the surface is PRINTED so a reader sees what else fired without this file grading it. Re-verified on the merged tree: M1 RED 4, M2 RED 5, M3 RED 3 + RED 2, N6 RED 1, N3 green (correctly), N8 RED 4, R1 RED 2, R2 RED 1. All nine suites green. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015VXjA3LWccN1rJsk3okyPC
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
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. 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.