2026-04-24 16:34:10 -04:00
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# EG4 LifePower4 v2 → Home Assistant
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Daemon that polls EG4 LifePower4 48V 100Ah v2 (Auto-Addressing) packs over
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RS-485 and publishes per-pack telemetry to MQTT with HA auto-discovery.
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## Status: live
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2026-04-25 19:00:44 -04:00
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All 3 packs publishing in `modbus_per_pack` mode, each on its own FTDI
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RS-485 adapter. Per pack, ~70 named entities + 136 raw `register_NN` series:
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2026-04-24 16:34:10 -04:00
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```
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lifepower4_1_pack_voltage 52.56 V (16 cells × 3.285 V)
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lifepower4_1_cell_01_voltage 3.285 V
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lifepower4_1_cell_voltage_delta_mv 2 (outstanding balance)
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lifepower4_1_soc 100 %
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lifepower4_1_capacity_ah 100.0 Ah
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lifepower4_1_temperature_pcb 55 °C
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2026-04-25 19:00:44 -04:00
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lifepower4_1_model "LFP-51.2V100Ah-V1.0"
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lifepower4_1_firmware_version "Z03T21"
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lifepower4_1_firmware_date "20260206"
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... plus 14 warning bits, 14 protection bits, all 136 raw registers
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2026-04-24 16:34:10 -04:00
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```
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2026-04-25 19:00:44 -04:00
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The decoder maps registers to fields per a layout reverse-engineered from
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the EG4 BMS Tool's Mach-O binary (see [`NOTES.md`](./NOTES.md) §"Modbus
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polling" and §"Register map"). Each cycle, the daemon issues two Modbus
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fn=0x03 reads per pack — block 1 (39 regs at 0x0000) for live status, and
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block 2 (91 regs at 0x002D) for counters + model + firmware strings —
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mirroring what the vendor BMS Tool itself does.
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2026-04-24 16:34:10 -04:00
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## Modes
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Set by `bus.mode` in `~/.config/eg4-battery/eg4-battery.yaml`:
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| Mode | When to use |
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|-------------------|---------------------------------------------------------|
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| `modbus_per_pack` | **Default.** One FTDI per pack's RS485 port. Fully decoded HA entities. |
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| `active` | Legacy 7E/0D (V1 firmware only). Not used on V2 hardware. |
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| `passive` | Listen-only Modbus sniff (19200). Diagnostic use. |
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See [`NOTES.md`](./NOTES.md) for architecture, register map, LVX6048
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compatibility findings, and bring-up checklist.
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## What's in the box
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```
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eg4battery/
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├── README.md ← start here
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├── Install.md ← detailed walkthrough + mode-switch howto
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├── NOTES.md ← architecture, register map, port matrix
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├── install.sh ← idempotent installer (supports --dry-run)
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│
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├── bin/eg4-battery ← single-file daemon (uv PEP-723 inline deps)
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│
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├── config/eg4-battery.yaml.example ← template, multiple-pack config
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│
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├── etc/ mirror of target paths (Pi side)
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│ ├── udev/rules.d/99-eg4-rs485.rules
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│ └── systemd/system/eg4-battery.service
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│
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├── homeassistant/ ← drop into your HA config dir
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│ ├── README.md (what goes where + retention tiers)
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│ ├── recorder.yaml (exclude noisy / diagnostic entities)
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│ ├── template_sensors.yaml (derived: power, temp_max, cell_imbalance, stack rollups)
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│ └── lovelace_overview.yaml (3-pack stack dashboard)
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│
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└── tmp/ ad-hoc diagnostics
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├── port-probe (single-cycle 9600/19200/7E probe)
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├── eg4-snapshot (47-reg dump for BMS Tool cross-check)
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└── bms-tool-ref/ (unpacked vendor BMS Tool for RE reference)
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```
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## Quick start on a fresh host
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```bash
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cd ~/solar/eg4battery
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./install.sh --dry-run # mock cycle, prints MQTT payloads, exits
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# Edit ~/.config/eg4-battery/eg4-battery.yaml:
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# - For modbus_per_pack: one 'packs:' entry per pack, each with port + address + baud
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# - mqtt.host / username / password
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./install.sh # real deploy; auto-starts once creds are filled
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journalctl -u eg4-battery.service -f
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```
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## Related packages
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- [`../LVX6048/`](../LVX6048/) — inverter-side monitoring via PI18 over USB-HID.
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Same MQTT broker. Between the two packages, HA sees every useful number from
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the stack.
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## Acknowledgements
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- `battery/eg4_lifepower.py` — V1 protocol decoder adapted from
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[`Louisvdw/dbus-serialbattery`](https://github.com/Louisvdw/dbus-serialbattery).
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Historical; V2 firmware moved to Modbus on a different port.
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- EG4 Electronics `lv_host.app` — the vendor BMS Tool; its Qt binary's SQLite
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schema and strings gave us the register-to-field mapping.
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