Sol-Ark › AC output (LOAD terminal), grid terminal and neutral/ground busbars

Inverter trips F34 overload below rated total

manufacturer says

Applies to: 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

Symptoms

Off-grid or in backup, the inverter shuts its output down and logs F34 (sometimes F15, F18 or F26) although the combined load is under the nameplate rating
On the 12K the sticker's 4,800 W line-to-neutral figure turned out to be a hard limit on either leg, and an imbalance of about 1,800 W between L1 and L2 was enough to trip it
Installers also see it when a water heater, dryer or well pump ends up on a critical-loads panel that was sized by guesswork

Alerts and codes

F15F18F26F34

The cause and the fix

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Manufacturer documents

15K Installation Manual Rev 13 16July2026