Sol-Ark › Battery Canbus / RS485 BMS port

Inverter beeps F25 with no battery connected

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

A grid-tied system with no battery connected beeps or logs F25
F13 Grid_Mode_change appears when switching between No Batt and Battery modes

Alerts and codes

F13F25

The cause and the fix

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Manufacturer documents

12K Indoor Legacy Model Installation User Manual 1
15K Installation Manual Rev 13 16July2026