Growatt SPF-3500ES, Руководство по устранению неисправностей

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Fig.3 MOSFET Testing
Every mosfet has 3 pins ( G, D, S ). Put black tong of multimeter on D pin and Put Red tong of
multimeter on S pin.
0.38-0.7V on multimeter is normal. If multimeter display zero, it means the mosfet has short
circuit.
7 51 fault
51fault means over current fault. Most of time, it is caused by MOV board inside inverter. Mov board is
used for SPD and prevent surge from utility input.
Testing method:
a. Try to disconnect all load from inverter. Then observe if 51fault will disappear.
b. Take out MOV board from inverter. Mov board is connected to utility input in parallel.