Sol-Ark › Battery Canbus / RS485 BMS port

Battery comm lost, inverter falls back to voltage mode

reported in the field

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

Symptoms

An exclamation point appears above the battery icon and the system keeps running on voltage rather than percentage
If the fallback fields were never set the stored defaults are lead-acid values (about 42 V shutdown, according to the webinar) rather than values safe for the lithium battery

Alerts and codes

F58exclamation point above battery icon (comms lost, battery-voltage mode)

The cause and the fix

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