Growatt SPF 3500-5000ES 09Fault repair
09fault meaning:
Bus soft start failed
1. BUS Voltage is lower than 400V，or Bus voltage is lower than 8 times of battery voltage
OR
2. It can’t reach target voltage in 30 seconds.
Cause: Damaged output stage
Solution: Repair by replacing all optocouplers, Diodes around optocouplers, Transformer for IGBT Driver, IGBTS
