glenn schrooyenandClaude Opus 5
a6af332048
Four review findings, none of them in executable code. The control law, the tests and the instruments' arithmetic are untouched; every number below was re-measured against the committed 16-day capture before it was written down. R1 - app/control.py carried a justification the decision record and MUTATION.md habit 22 had already retracted, and it was false about the code it sits in. It said an unconditional placement "would also pull the integrator toward a command the SATURATION freeze is pinning", priced at 118 of 256 250 ticks. The 118 was measured against a different pair; on the pair the sentence names the two forms are bit-identical - 0 of 256 246 ticks, re-measured. And the narrow form that shipped DOES move a saturation-frozen integrator: it runs before the freeze block and is not gated on `frozen`. Of 79 160 frozen ticks the cap changes `i_w` on 1095, and on 679 of those it moves it further out on the side it was already on - putting back magnitude the freeze had just let fall, which the freeze's own rule forbids. Worst case 2424 W, at prev_w -3400 W, grid +4697 W, actual -4144 W, sat_count 2 -> 3: the freeze leaves the integrator at -176 W and the cap drags it to -2600 W. It never overrides a same-cycle refusal (the freeze clipped on 75 512 ticks, the slew bound on none of them), and that is stated too. It is also where SAFETY-13's settle values went: gating the cap on `not frozen` puts test_control.py part 5 back at -1190 W exactly, while part 4(b) does not come back - that one moved for the winding reason. R3 - the record read its own sensitivity table backwards. `fit_plant()` picks lag 7.5 s on battery-power RMS, which separates it from 2.5 s by 0.3 %, while the tool's own printed fidelity measure (export against the recorded 29.43 kWh) prefers 2.5 s by the whole 35 % gap. Swept properly: at every lag <= 5.0 s release/1.0's worst quarter is ALREADY 3434 W and this card changes it by exactly zero. The 3739 -> 3434 W headline exists at one plant. New section 3a carries the table; the export reduction now leads every summary and the peak is presented as lag-dependent. The form-A rejection is strengthened rather than weakened: form A is worse on the billed quarter at every lag where release/1.0 produces a peak at all, and at every top-N cut of the quarters. R2 - DOCS.md stated modelled watts to the owner as measurement. It now leads with the export reduction, says the figures are simulated, and says plainly that no capacity-tariff improvement is promised. R4 - tools/slew_sim.py --slew narrated "the OVER-ABSORPTION does not move, and at the slowest slews it is slightly WORSE" while printing a monotonically falling column. That sentence is TRUE on release/1.0 (reproduced: 958/1107/1133/1058/987/1029/1150/1143/1081) and false under this branch's law (777/734/663/563/553/507/435/358/321), so SAFETY-39 is not retracted: its record gets a forward reference, and the script now reads SLEW_LEAD_STEPS out of the law it imported and narrates from the column it just printed. Both branches of that narration were driven. R5 - three counts in the L table were decoration and are re-driven in the CI image on a `cp -a`, purged, `:ro`, one file at a time: L5 is 5+5 with the function names exchanged and 5+4 with the branch bodies exchanged (two mutations wearing one name, now listed separately), L6 is 6+3. The separable- state count is grid-dependent and three sweeps disagree, so all three are quoted with their grids and the load-bearing claim is WHERE they separate. R7 - "a large import answered too weakly" is not what the aggregate shows. Form A cuts import by 5.45 kWh and export by 5.18 kWh, and paired per tick delivers 8.56 kWh less offtake energy on the ticks release/1.0 was importing. The harm is a tail redistribution inside quarters that already net to offtake. The conclusion stands; the sentence is narrowed to it. Verified: the full suite in the CI image, purged tree, `:ro` mount, one file at a time, exactly the command in .gitea/workflows/checks.yml - 30/30, exit 0. 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.