113
Alarm ID Alarm Name Corrective Measures
039
Low System Insu-
lation Resistance
Wait for the inverter to return to normal. If the fault oc-
curs repeatedly:
1. Check whether the ISO resistance protection value
is excessively high via the app, and ensure that it
complies with the local regulations.
2. Check the resistance to ground of the string and
DC cable. Take corrective measures in case of short
circuit or damaged insulation layer.
3. If the cable is normal and the fault occurs on rainy
days, check it again when the weather turns fine.
4. If there are batteries, check whether battery cables
are damaged and whether terminals are loose or in
poor contact. If so, replace the damaged cable and
secure terminals to ensure a reliable connection.
5. If the fault still exists, contact SUNGROW.
106
Grounding Cable
Fault
1. Check whether the AC cable is correctly connected.
2. Check whether the insulation between the ground
cable and the live wire is normal.
3. If the fault still exists, 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.
714
BMS Communi-
cation Fault
1. Check whether the communication cable and the
terminals are abnormal. If so, correct them to ensure
reliable connection.
2. Reconnect the communication cable of the meter.
3. If the fault still exists, contact SUNGROW.
932–935,
937, 939
Battery Alarm
Generally, the battery can automatically recover. In
case the alarm persist for a long time:
1. If the alarm is caused by ambient temperature,
such as over temperature alarm or low temperature
alarm, take measures to change the ambient temper-
ature, such as improving heat dissipation conditions.
2. If the fault persists, contact battery manufacturer.
User Manual 10 Troubleshooting and Maintenance
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