For every pack on the bus
| Value | What you do with it |
|---|---|
| State of charge, capacity remaining | Plan the evening, or the outage, with real numbers. |
| Voltage, current, power | See which packs carry the load and whether the bank shares it evenly. |
| 16 cell voltages, min / max / spread | Spot a weak cell before it caps the whole bank. |
| Cell and MOSFET temperatures | Garages and sheds get hot in summer; keep an eye on it. |
| Cycle count and state of health | Follow ageing over years, pack by pack. |
| Warnings and protections | Know why a pack stopped charging or discharging. |
Bank totals
The dashboard also sums the bank: total stored energy, total power in or out, average state of charge, and the hottest and weakest pack at any moment.
Display options
- Screen on the box: bank SOC, power and status, cycling through packs.
- Local web dashboard at
http://moniwatt.local, password protected. - Home Assistant via MQTT discovery, one device per pack.
- JSON API for any other tool.
- Remote dashboard (optional): access from anywhere, offline alerts, CSV export.
Works alongside your inverter
Your EG4 inverter keeps talking to the master battery as before. EG4 Monitor reads, never writes, and is designed not to disturb the closed-loop communication between battery and inverter. When you order, tell us your inverter model and how the batteries are linked, so we test that exact layout.