Growatt
Error 301
AC Overcurrent -- Output Short Circuit
The inverter detected excessive current on its AC output, indicating a potential short circuit or fault downstream.
Common causes
Short circuit in AC wiring between inverter and consumer unitFaulty AC isolator contactsConsumer unit MCB rated too low for inverter AC output
What to check
STEP 1
Open AC isolator and consumer unit MCB. Inspect AC wiring for visible damage. Confirm L N PE connections match the SPH AC Grid wiring diagram
STEP 2
Confirm MCB rating matches inverter output. SPH 6kW requires minimum 32A MCB on 6mm2 cable
Escalate if
Wiring inspects clean and MCB is correct rating but fault recurs -- possible inverter output stage fault, escalate
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