adminandClaude Opus 5
1abca15520
Platform is identified by characters 6-8 of the serial number, and only platform 105 (ES/EM/BP - ESU EMU ESA BPS BPU EMJ IJL) speaks the AA55-era meter bus this product emulates. The reference unit is 95000BPS225W0290 -> BPS. Everything with a "-20"/G2 suffix is a different platform: SBP G2 (SPB/SPN) and ES G2 (ESN/ESC) are platform 745, ET/EH/BT are 205/745/753. PV-only inverters (SDT/DST/MSU/NSU) have no battery to control at all. Added as the first item in Step 0 of the field guide, because it is a 60-second check that decides whether the job can be quoted, and as a table in the README. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016NckgXecasQb2eSsPYNSW6
91 lines
3.8 KiB
Markdown
91 lines
3.8 KiB
Markdown
# GoodWe RS485 Controller — Home Assistant add-on repository
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Replaces a GoodWe battery inverter's vendor controller with a local one: holds
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net grid exchange at zero by emulating the inverter's smart meter over RS485,
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and runs the monthly battery maintenance cycle the vendor box was doing.
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```
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repository.yaml add-on repository metadata
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goodwe_controller/ the add-on
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config.yaml manifest + options schema (the per-site config form)
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app/ the controller
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control.py the control law — pure functions, no I/O
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maintenance.py the monthly cycle state machine
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hass.py Supervisor/Core API access
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store.py persistent state in /data
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mqtt.py optional status entities
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web.py ingress UI
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main.py orchestration, heartbeat, failsafe behaviour
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test_control.py runnable checks — no framework needed
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test_maintenance.py runnable checks — walks a full cycle in fake time
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DOCS.md the add-on's documentation tab
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firmware/goodwe-master.yaml ESPHome config for the T-CAN485
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estop/rs485_log.py optional RS485 e-stop / bus witness
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docs/GoodWe-RS485-Field-Guide.pdf the guide techs carry (10pp, A4)
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docs/build_guide.py its single source - rebuilds the HTML and PDF
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FIELD-GUIDE.md how to edit and rebuild the guide
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```
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## Install
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Settings → Add-ons → Add-on store → ⋮ → **Repositories** → add this repository's
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URL, then install **GoodWe RS485 Controller**.
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Requires **Home Assistant OS or Supervised**. Add-ons cannot be installed on HA
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Container or Core.
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## Read this first
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**The inverter holds its last command forever.** It has no meter-timeout of its
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own — a controller that dies mid-command leaves the battery running until a
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human intervenes. Measured on real hardware: 5 kW of discharge held for 113
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seconds after a controller went silent.
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Three layers exist because of that, and only the third covers the Home Assistant
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machine itself dying:
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1. **ESP32 watchdog** — no fresh setpoint for ~30 s → command 0 W, and keep
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commanding it.
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2. **Wind-down before firmware updates** — 0 W written before the update starts.
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3. **RS485 e-stop (optional)** — writes 0 W after 30 s of total bus silence.
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Sites sold without the e-stop must have the acknowledgement in `FIELD-GUIDE.md`
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§10 signed.
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## Development
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The control law and the maintenance machine are pure Python with no Home
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Assistant imports, so they run anywhere:
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```bash
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cd goodwe_controller
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python3 test_control.py
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python3 test_maintenance.py
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```
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Both must pass before shipping any change. They are not unit-test theatre —
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each assertion corresponds to a rule whose absence produced an observed failure
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on real hardware, and the comments in `control.py` say which.
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## Compatibility
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**Check the serial number, not the model name.** Characters 6-8 of the serial are
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the platform tag:
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| tag | platform | verdict |
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| `ESU EMU ESA BPS BPU EMJ IJL` | 105 — ES/EM/BP, AA55-era meter bus | **supported** |
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| `SPB SPN` | 745 — SBP **G2** (`GW…-SBP-20`) | no |
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| `ESN ESC` | 745 — ES **G2** (`GW…-ES-20`) | no |
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| `ETU EHU BTU …` | 205/745/753 — ET/EH/BT hybrids | no |
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| `SDT DST MSU NSU …` | PV-only inverters — no battery to control | no |
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A "-20" or "G2" suffix means a different platform with a different meter
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protocol. The tags come from the `goodwe` library's `PLATFORM_105_MODELS`, which
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is also what Home Assistant's own integration uses to pick a protocol.
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- GoodWe **ES / BP family** inverters (AA55 / RS485 meter-bus generation)
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- The protocol is **reverse-engineered**. There is no vendor contract, and a
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firmware change on GoodWe's side could break every installation at once. Say
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so when you sell it.
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