Cause-
- Inverter detects grid instability, internal fault current high
Solution-
- Test – With DC Switch OFF
- Measure AC voltage
- Test AC line for THD
- Test – With DC Switch ON Test AC line for THD
- Multiple inverters/turn one off
- Impedance matching adjustment or box
- Internal damage
- Wire came loose in shipping
Troubleshooting - Grid is Unstable due to Interference between the AC equipment. This can be remedied by checking the grid filters, downstream equipment, and power board. Another instance would suggest that multiple inverters are installed within the line and have created an unstable grid voltage.