EG4 › AC output / EPS inverter stage
EPS overload with one leg over its limit
reported in the field
Symptoms
- The inverter shuts its output off with Warning 28, 'EPS overload' or F07 while the total load looks within rating
- On a FlexBOSS18 the trip came at 13,173 W with the legs imbalanced and again at 12,869 W with 4 kW of PV coming in
- A 12000XP kicks out about 10 seconds after one leg passes 6,500 to 6,700 W and shows a yellow-orange status light before that
- A 6000XP trips at 30 A on one leg
- Three paralleled 6000XPs go dark at night with a dryer, cooking and heat strips together
- A 12000XP V2 shows Warning 28 continuously through a 14 to 15 kW PV-assisted run without tripping
- In no-battery mode a dryer start knocks everything out with Fault 12
Alerts and codes
Warning 28Fault 12W028F07 overloadEPS overloadstatus light yellow / orange (leg imbalance)
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.