To begin troubleshooting Ground Faults, it is important to refer to the inverter's manual and error code system beforehand. Grounded Arrays are build with detection devices (GFP) in order to help you identify the cause. Referring to the Inverter's Manual will then help you find solutions to the Ground Fault in order to prevent damage and potential hazard to the solar array. Residential (Single Phase Inverters) will not have a GFDI fuse and will need to be solved according to the manufacturer's manual.
Steps to help you troubleshoot ground faults:
- Visually inspect the inverter. Is the inverter displaying an error code message or number that correctly identifies a Ground Fault?
- If inverter correctly displays ground fault error, drain capacitors and remove GFDI Fuse
- Check to see if GFDI fuse has been blown, if so you will need to replace after clearing the fault
- Remove positive and negative from PV array and reconnect DC power to the capacitors.
- Using a multimeter test , test the Positive to Ground, and Negative to Ground.
- Reading the multimeter the voltage should read 0V for the positive to ground and negative to ground connections. (Residual Voltage may be found)
- If no voltage is found check the remaining connection points with multimeter to find the ground fault path.
If no fault is found while testing the DC connection points, and ground fault persists contact the Inverter manufacturer for warranty information and further processing.