Growatt Fault 55 fault: DC voltage in AC output
Call a qualified installer
Urgency: high
What it means
The inverter detected DC on its AC output, which is an internal fault. It needs an installer.
Likely causes
- Internal 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)