FieldWatt: Solar PV Toolkit

INVERTER FAULT CODES The library now covers Ingeteam Ingecon Sun, sixteen alarms from 0001H through 8000H, each with what the alarm means and then an ordered list of what to check. Grid voltage and frequency trips start by correlating the timestamp across the plant, because one inverter tripping alone means something completely different from all of them tripping together. High DC input voltage starts with ambient temperature and time of day, since the classic cause is a cold clear morning lifting string open circuit voltage past the inverter maximum, which is a string sizing conversation rather than a fault. Branch faults carry the warning that consecutive failures escalate to a fatal error, so repeated resetting makes things worse. POWER ELECTRONICS FREESUN Two entries on the HEC series. The GFDI entry matters most: on a grounded pole installation the only permitted earth point is inside the inverter through the GFDI, and a second grounded connection anywhere else silently defeats it, so the plant looks protected and is not. Their own caution label states that normally grounded conductors may be ungrounded and energised when a ground fault is showing. The second covers the insulation monitor, whose service life Power Electronics defines in trips rather than years, with replacement due after 100 ground faults that tripped it.