Fault Description / Instruction:
- Turn OFF AC switch to disconnect from grid.
- Open fuse holders to isolate PV strings. Test strings with string test set
- Add one PV string at a time, and start up inverter to see if alarm occurs.
- If no alarm, turn OFF AC switches to disconnect grid, add in the next string. Start inverter again
- Continue until the string that triggers the alarm is identified. Trace back the faulted string to find any leakage to Earth Ground.