Sol-Ark › PV MPPT inputs and PV DC disconnect

Inverter shows F20 or F55 DC overload

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

The inverter logs F20 Tz_Dc_OverCurr_Fault, F55 DC_VoltHigh_Fault, F37/F39 DCLLC overcurrent or F40 battery overcurrent
'DC Overload Fault' in the troubleshooting guide
The system may restart when the battery voltage exceeds 59 V

Alerts and codes

F20F37F39F40F55

The cause and the fix

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Manufacturer documents

15K Installation Manual Rev 13 16July2026