glenn schrooyenandClaude Opus 5
cab267c4f3
Round-2 non-blocking findings, both fixed. ⚠️ THE WINDOW FIGURE WAS ARITHMETIC NOBODY HAD RUN. `min_w * (w_A + w_B) / w_B` = 6500 W is correct about `_fill()`'s PROPORTIONAL regime and is not a reachable steady state: the healthy pack's own 5000 W rating binds first. SWEPT on part 8b's own fixture, reproduced rather than transcribed: load equal OPT-09 site target A B 1000 199/200 0/200 1080 997 83 2000 199/200 0/200 2170 2003 167 3000 199/200 0/200 3250 3000 250 4000 199/200 4/200 4340 4006 334 4500 199/200 8/200 4890 4514 376 4900 199/200 41/200 5320 4911 409 <- largest suppressed 5000 199/200 195/200 8000 5000 3000 <- A at its rating 6000 199/200 195/200 8000 5000 3000 So the alarm returns BELOW the formula bound, not above it, and the largest site target reached with the wedged unit still under the 500 W threshold is 5320 W - not 6500. The equal-weights "suppressed below 1000 W" bound is unreachable for the same reason: the equal arm names the wedged unit 199/200 at EVERY load swept, 1000 W included. The formula and its check are kept, because the mechanism they state is right and it is the mechanism that generalises to other ratings. What was wrong was the sentence around them, in four places, implying the site passes through the bound. Each now carries the sweep and says the rating binds first. ⚠️ THIS NUMBER CAME FROM THE REVIEW, NOT FROM THE BRANCH, and was adopted in good faith by the implementer. The reviewer found it in round 2 and said so. That is worth recording: a figure arriving from a trusted reviewer got less scrutiny than one written by the author, and PROC-01's eight fabricated numbers in two days is now nine. The rule that catches it is the same either way - run it before you ship it. Also: the DECISIONS header's base sha, stale for the third time (464d398->3368231->3d29993, moved by two rebases and caught by review each time). It now records that history, and the header is why `test_translations.py`'s counts are computed rather than typed. SAFETY-43 is now named by id where the follow-up is referenced, so a reader can follow the thread from the disclosure to its closure. Suite: 25 files, all pass. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01BwRLw7eKYj2byVdwB6kbjU
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.