EG4 › battery management system (BMS)

Battery BMS cuts out when a large load starts

reported in the field

Applies to: 12000XP, 6000XP, FlexBOSS21, PowerPro, WallMount Indoor 280Ah, WallMount Indoor 314Ah, LifePower4 V1, LifePower4 V2

Symptoms

A 12000XP on a single server-rack or 280Ah battery throws over-voltage or EPS-overload faults and drops output when a heater, heat gun, car charger or motor starts
A 6000XP on one LifePower4 alarms 'over current protection' running an 18,000 BTU window unit that runs fine on two or three batteries
A single WallMount on a 10 kVA Victron Quattro cuts out at about 9,500 W (190 to 200 A) with 'High discharge current' logged
A car lift on one 12000XP sags the voltage and flickers the lights

Alerts and codes

EPS overloadover current protectionHigh discharge current (Victron Cerbo GX alarm)

The cause and the fix

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