Grounding fault detected on PV side. Safety-critical fault — must not be dismissed.
Common causes
Damaged cable insulation on PV string creating path to groundMoisture ingress into junction box or connectorPanel frame or racking in contact with live conductor
What to check
STEP 1
SAFETY CRITICAL: Do NOT disconnect DC switch while DC current above 0.5 A. Wait for current to fall below 0.5 A. Disconnect DC switch. Unplug faulty string connectors.
STEP 2
Do NOT reinsert faulty strings until fault fully identified and cleared. Inspect all cables, connectors, and junction boxes for insulation damage or moisture. Repair or replace.
Escalate if
No visible damage found or fault cannot be isolated — contact Sungrow support
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