Grid voltage above the set standard limit. Shown as OV-G-V 01 to OV-G-V 05 depending on trigger (level 1, transient, 10-minute average, level 2). Auto-reconnects when grid returns to range.
Common causes
PV export voltage rise on the local networkWrong grid standard selectedLoose AC connection or undersized AC cable
What to check
STEP 1
If occasional, let it auto-recover. Check the grid standard is set correctly for UK G98/G99.
STEP 2
Measure grid voltage at the inverter AC terminals during peak export. UK limit is 253 V.
Escalate if
Voltage and standard confirmed correct but alarm continues
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