glenn schrooyenandClaude Opus 5
b548525d10
`self.i_w` has been a separate quantity from the command since SAFETY-04 and has left the process nowhere at all - no entity, no MQTT attribute, no log line. The investigation behind SAFETY-48 could only RECONSTRUCT it from the grid trace plus a replay; the reconstruction reproduced about a third of the engagements it was checked against and was discarded, so the card it was gathered for had to be argued from a measurement nobody could stand behind. It could not have been made to work either: `i_w` depends on every cycle before it, including the ones where the arbiter overrode the loop and `main.py` re-seeded `self.i_w = self.target`, and that re-seed is invisible in the grid trace. THREE SITE ROWS, APPENDED AFTER release/1.0's EIGHT. `loop_i` is `Decision.i_w` - the accumulator after the cycle, before the output clamp, the slew limit and quantisation. `loop_lead` is `decision.i_w - prev_w` against the command `compute()` was HANDED, which is not a subtraction of the other two published rows: `Setpoint` is the arbiter's output and is this cycle's, so on any cycle the arbiter overrode the loop the two differ - and that is exactly the cycle on which the integrator was re-seeded. `loop_reason` is `compute()`'s own word; the arbiter's `explain()` prints the winning claim's NAME and has never carried the claim's reason, so `slew-limited` appears in neither the `Why` row nor `Controller status`. Measured on the same cycle: arbiter `'loop -> -5000 W'`, loop `'i-clamped'`. NOTHING IN THE CONTROL PATH MOVED. `app/control.py` is not in this diff. `compute()`, its returned `Decision` and every constant it reads are identical to release/1.0, and all nine of release/1.0's retained discovery messages are byte-identical and still FIRST in the announcement. Evidence: 30/30 suites green in the CI image. Nine mutations, ONE survivor, reported as one: `decision.i_w - self.target` for the lead is +2 B and green because `cycle()` has not reassigned `self.target` at that line - the name is kept for the coupling, not for a behaviour it buys, and M2b (+8 B) is the mutation that does change the value and is red. AND TWO OF THIS CARD'S OWN CHECKS COULD NOT REACH THE FAILURE THEY NAMED. "the published integrator reaches its bound" was GREEN under the card's named mutation (publish `prev_w`, -3 B), because the command reaches the bound too - twelve cycles later. It asserts the LEAD TIME now and is red on 5. "a stopped controller publishes not-running" was GREEN under deleting that branch's assignments (-45 B, -67 B), because the fixture STARTED stopped and `__init__` writes the same values; it stops the controller part-way through a run that has already wound the integrator to -5000 W. Both are MUTATION.md habit 4, found by the battery rather than by review. No CHANGELOG section: `test_version_gate.py` 11b refuses a newest `## ` heading that is not config.yaml's `version:`, and opening one would mean taking a packaging decision this card does not get to take. The operator account is in DOCS.md and the release note belongs to the next PKG ticket. 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.