Axpert Fault 51 fault: Over-current or surge
Keep an eye on it
Urgency: medium
What it means
The inverter saw a current surge and tripped. One restart is fine; repeats need an installer.
Likely causes
- Appliance start-up surge
What you can safely check
- Restart the inverter once using its documented switch-off and switch-on procedure.
- If it keeps coming back, stop and call a qualified installer.
When to call a pro
If it doesn't clear on its own, happens often, or comes with burning smells, heat or noise, call a qualified installer.
Solar systems carry dangerous voltages. Only do the safe checks listed. If unsure, call a pro.
Source: Voltronic Power 1.5KW/3KW/5KW Solar Inverter/Charger User Manual v1.8 (Axpert VM III) (paraphrased)
Axpert-type inverters are sold under many names; codes can differ slightly by model.