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The instrument SAFETY-07 will read: the highest clock-aligned 15-minute average offtake of the calendar month, persisted in /data/tariff.db across two retention tiers, with a monthly peak that recompute_month() proves has not diverged from the 15-minute tier. Files no claim, applies no clamp, commands nothing.
AC 1 was already built and unwired - p1.QuarterAverager on the base already does clock-aligned 900 s blocks, time-weighted over irregular spacing, offtake-only, per-phase, with the max_hold_s gap rule; verified on 9aadf46 rather than taken on the PR's word, and the p1.py diff removes zero lines. So this is persistence and reduction rather than a second source of truth for the quantity the money depends on.
Block rather than rolling, and the reading is provable: a 900 s burst centred on a :15 boundary bills at 2000 W and reads 4000 W through a trailing window - exactly 2.00x, the supremum - and since the aligned windows are a subset of all trailing windows, a rolling figure can only ever read HIGH, never low. On the real captures, 1.09x and 1.05x.
Reviewed independently: the encoded EU DST rule graded against zoneinfo at minute resolution over eight transitions, all of 2026 hourly and every month boundary - 0 mismatches - and the wrong-arm fromutc() mutation that differs only inside the one-hour transition window now goes red, which is the class that escaped the first draft. All four persistence behaviours produced rather than read, including a hard os._exit with no close() losing neither a banked quarter nor the open checkpoint. The SAFETY-20 syntax grader discriminates on names; two evasions remain in its import half.
AC 3 is NOT met and the check says so: no 30-day dataset exists. The two days that do exist replay to 189/190 quarters = 99.5 % under the 3500 W soft limit, uncontrolled - the baseline SAFETY-07 must improve on - and 2026-08-20's peak reproduces independently at 5029.8 W, a billed quarter over the live install's own 5000 W rating. Do not close the card as AC 3 met; start the 30-day capture.
Four reviewer mutations survive, recorded on the PR. The one to act on: record_block() ignoring its policy argument stays green, because every block reaching the store in the check is single-phase where NET, SUM and MAX collapse - the third instance of the degeneracy trap this file already documents twice, sitting on the exact line the pending per-phase product decision will change.
No conflict with TARIFF-02 (#16) beyond CHANGELOG.md, verified from both sides.
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.