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014
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
module/cable. Take corrective measures in case of
leading 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.
015
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.
016 Arc fault
1. Disconnect the DC inputs and check whether
the DC cables are damaged, whether the wiring
terminals or fuses, if necessary, are loose or in
poor contact, and whether there is a PV module
burnt. If so, take corresponding corrective
measures.
2. After taking corresponding measures in step 1,
reconnect the DC inputs. Remove the arc fault
through the App, and therefore the inverter will
recover.
3. If the alarm persists, contact SUNGROW.
9 Troubleshooting and Maintenance User Manual
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