glenn schrooyenandClaude Opus 5
f4914a174a
The 15-minute block average was already built and unwired. p1.QuarterAverager computes clock-aligned 900 s blocks, time-weighted over irregular telegram spacing, offtake-only and per-phase; P1Ingest.blocks was a 96-entry list in memory that a restart erased. So this is the persistence and the monthly reduction, not a second accumulator - a second one would be a second source of truth for the exact quantity the money depends on. BLOCKS, NOT A SLIDING WINDOW. The card says "rolling"; 9.1 bills "the highest 15-minute average offtake" and states its own worked case per QUARTER - one 4998 W quarter moving a monthly peak from 4832 to 5013 W. A trailing window reports a peak the meter never bills, and reports it HIGH: a burst straddling :15 fills the window completely while contributing to two block averages at partial weight. DELIVERED, NOT INTENDED. tariff.py only ever sees P1Sample - the meter's own reading - and never a setpoint. SAFETY-20's open question does not arise for a capacity tariff: the utility integrates the current that flowed. AN UNREADABLE STORE IS NOT A ZERO PEAK. peak() answers OBSERVED / NO_RECORD / NOT_OBSERVED with peak_w None unless observed, which is riglock.holder()'s fix applied to something that spends money. A peak read as 0 W hands SAFETY-07 maximum headroom and disarms the guard at the moment its own storage breaks. Restart mid-block resumes the accumulator through a new snapshot()/restore() pair, checkpointed every 15 s and cleared in the same breath as a block close. The held sample keeps its ORIGINAL timestamp, so an outage is integrated under the same max_hold_s rule a running process would apply. quarter_start is the primary key and a re-bank may only ever RAISE a figure. Calendar months are LOCAL: a quarter starting 22:15 UTC on 31 August bills in September. No new option (the limit is the existing peak_cap_w), so config.yaml and validate.py are untouched and CFG-03 is not widened. No second peak entity: peak_forecast_entity stays the input to maintenance_charge_floor(), because repointing that consumer changes what moves energy and belongs to SAFETY-07. AC 3 is NOT met. It asks for 30 days of replay; two days of this house's real meter exist and are committed here. test_tariff.py part 9 replays them, reports the percentage next to the sample size in days, and asserts nothing about 95 %. 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.