Sol-Ark › GEN port and two-wire generator start relay

AC-coupled PV inverter faults F35 at full battery

manufacturer says

Applies to: 5K-1P-N, 5K-2P-N, 8K-2P-N, 8K-2P-L, 12K (first generation, 2019 to 2021), 12K-2P-N, 12K-2P-LL Limitless, 15K-2P-N, 15K-2P-LV, 18K-2P-N, 18K-2P-LV, 30K-3P-208V, 60K-3P-480V

Symptoms

Right after the battery hits 100% state of charge the grid-tie PV inverter fed from the GEN port shows F35 (AC no utility) and stops
Production, grid reading and frequency all drop to zero until load pulls the battery back down to about 95%, when everything resumes on its own

Alerts and codes

F35

The cause and the fix

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Manufacturer documents

AC Coupling Rev3 29May2026