EG4 › battery management system (BMS)
One battery's SOC drops while others stay full
reported in the field
Symptoms
- In a 4-5 battery LL-S bank on a 6000XP, one battery's reported SOC drops toward 0% while the others stay near 100%, forcing the generator auto-start SOC trigger unrealistically high
- Two 14.4kWh outdoor batteries reading 96% deplete to 0% in about 4 hours under a modest continuous load, with a 3-4% voltage/charge gap between them that shrinks slowly over days of cycling
- And two paralleled WallMount Indoor batteries develop a growing SOC gap as seasonal solar output drops and the bank cycles deeper each night
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.