How do we troubleshoot DC Errors? Most inverters look for errors in similar ways, no matter who the manufacturer is, they still use either isolation testing, or a current sensor to determine if you have a ground fault in a PV system. (isolation testing is where the inverter measures the ohms between ground and the DC circuit, if its below a certain threshold it trips the inverter and calls out a ground fault. Current sensing is a GFDI breaker that trips offline when there is current moving between the negative conductor and ground. You typically see isolation testing on floating arrays, and GFDIs/current sensing on grounded arrays).
Knowing how your Inverters look for faults can help determine how you troubleshoot them. The manual for the inverter is the first key in determining how to troubleshoot.
- Start at the inverter...
