105
Alarm ID Alarm Name Corrective Measures
028, 029
PV reverse con-
nection fault
1. Check whether the corresponding string is of re-
verse polarity. If so, disconnect the DC switch and ad-
just the polarity when the solar radiation is low and
the string current drops below 0.5A.
2. Check whether PV strings connected to the same
MPPT have the same number of PV modules. If not,
take corrective measures.
3. If the alarm persists, contact SUNGROW.
037
High ambient
temperature
1. Check whether the inverter is directly exposed to
sunlight. If so, take some shading measures.
2. Check and clean the air ducts.
3. Check whether the sub-alarm ID 070 (fan alarm)
occurs through the App. If so, replace the faulty fan.
4. If the alarm persists, contact SUNGROW.
039
Low ISO
resistance
Wait for the inverter to recover. If the fault occurs
frequently:
1. Check whether the insulation resistance protection
value is extremely large through the App, and ensure
that it complies with the local regulations.
2. Check the resistance to ground from the PV mod-
ule/cable. Take corrective measures in case of lead-
ing to short circuit or damaged insulation layer.
3. If the cable is normal and the alarm occurs on rainy
days, check it again when the weather turns fine.
4. If the fault occurs on a cloudy day without rain but
there is stagnant water or vegetation on site, clear the
water and vegetation. If the fault persists, check it
again when the weather turns fine.
5. If the alarm persists, contact SUNGROW.
106
Grounding cable
fault
1. Check whether the AC cable is correctly connected.
2. Check whether the grounding cable and wire cores
are wrongly insulated.
3. If the alarm persists, contact SUNGROW.
051
Off-grid load
overpower
1. Reduce the power of loads connected at the off-
grid port, or remove some loads.
2. If the alarm persists, contact SUNGROW.
User Manual 10 Troubleshooting and Maintenance
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