Growatt Fault 03 fault: Battery voltage too high
Call a qualified installer
Urgency: high
What it means
The battery voltage is higher than it should be, which can damage the battery. An installer needs to check charging settings and the battery.
Likely causes
- Charging settings wrong
- Battery or charger fault
Don't try to fix this yourself
When to call a pro
Call a qualified installer now. Switch off heavy loads and don't try to repair anything yourself.
Solar systems carry dangerous voltages. Only do the safe checks listed. If unsure, call a pro.
Source: Growatt Off Grid Solar Inverter SPF 3500 ES / SPF 5000 ES User Manual v4.0 (paraphrased)