How do I fix Cell Under-Voltage Protection on a Growatt?

Initiate charge immediately. Check minimum SOC setting in ShinePhone — increase if battery is repeatedly reaching this protection threshold Then: After recharging, check for cell voltage spread in ShinePhone. Persistently low cells indicate cell degradation

Growatt

ARK: Cell UV Prot

Cell Under-Voltage Protection

One or more cells has fallen below the discharge protection threshold. Discharge halted. BMS ALM LED flashes green.

Common causes

Battery deeply dischargedMinimum SOC setting too low in inverterExtended period with no charge source

What to check

STEP 1

Initiate charge immediately. Check minimum SOC setting in ShinePhone — increase if battery is repeatedly reaching this protection threshold

STEP 2

After recharging, check for cell voltage spread in ShinePhone. Persistently low cells indicate cell degradation

Escalate if

Battery will not accept charge after being connected to charge source for >2 hours — deep discharge damage, escalate

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More Growatt fault codes

Error 200

AFCI — Arc Fault Detected

PV Isolation Low (RISO)

Error 300

AC Voltage Out of Range