Solar Electrical Troubleshooting in Chandler, AZ

Solar electrical troubleshooting is for the problems that do not announce themselves. The inverter shows a ground fault but restarts fine at night. One string reads zero while the other works. The breaker for the solar circuit trips every few days in July. These are wiring and connection problems, and in Chandler, heat and wind make them more common than people expect.

Where electrical faults hide

A rooftop system has dozens of plug connectors, a combiner or junction box, conduit running across the roof and down the wall, a DC disconnect, an AC disconnect and a backfed breaker in your main panel. Any of these can fail. Connectors that were not fully seated can loosen as the roof heats and cools each day, and a loose connection heats up further, which can damage the plastic housing around it. Monsoon gusts, which the National Weather Service says almost always top 40 mph in the Southwest, can work conduit straps loose and pull on cables.

Ground faults and isolation errors

A ground fault means current is leaking to the frame, the racking or the roof instead of staying in the circuit. Inverters detect it and shut down to protect the system. Common causes include cable insulation chewed by birds or rodents, a cable pinched under a panel frame, water inside a junction box, or a connector that has cracked in the sun. Finding the exact spot takes insulation resistance testing on each string, not just a reset.

Get a Free Estimate

Breakers and the main panel

If the solar breaker in your main panel trips repeatedly, the cause may be on the solar side or in the panel itself. A worn breaker, a loose lug or an undersized breaker for the inverter's output can all trip under summer loads. The City of Chandler's homeowner permit manual notes that all breakers inside a service panel must be compatible with the panel cover. A mismatched breaker is a common shortcut that causes problems later. We check the breaker type and torque along with the solar wiring.

Rapid shutdown and safety equipment

Newer systems include rapid shutdown equipment that de-energizes rooftop wiring when the system is turned off, which protects firefighters and technicians. When one of those devices fails, the system may refuse to start at all. Chandler has adopted the 2023 National Electrical Code, and new wiring work has to meet the code in force when it is permitted. Older systems are checked against the rules that applied when they were permitted, and we explain if any repair triggers an update.

What you get from a troubleshooting visit

You get a clear explanation of what failed, where it was, and why, along with photos and test readings. If we can fix it during the visit, we will tell you the price before we do. If it needs parts or a return trip, you get a written estimate first.