Sol-Ark › grid relay / AC main contactor

Inverter shows F30, Normal light stays on off-grid

manufacturer says

Applies to: 12K (first generation, 2019 to 2021), 12K-2P-LL Limitless, 15K-2P-N, 15K-2P-LV, 18K-2P-N, 18K-2P-LV

Symptoms

The inverter logs F30 (called a relay detection fault in the Deye videos)
With the grid disconnected from the inverter the Normal light stays on, which the manual says means the grid relay is likely fused

Alerts and codes

F30

The cause and the fix

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Manufacturer documents

15K Installation Manual Rev 13 16July2026