EG4 › inverter control board and firmware
Battery drains toward empty ignoring visible settings
fix confirmed
Symptoms
- An 18kPV with four LL-S batteries keeps discharging the whole-house load down toward empty even with SOC at 25% and grid power available, ignoring every AC Charge/SOC setting visible on the control panel and phone app
- On a new GridBOSS/18kPV DIY install, Battery Backup Mode cannot be enabled from the inverter settings at all
The cause and the fix
Subscribers see the cause, the fixes that worked and who did them, part numbers and recent prices when a part is involved, and the field reports behind this entry.