Abnormal grounding of solar inverter

What causes a ground fault in a PV system?

Ground faults in PV systems are one of the most common—yet most elusive—issues technicians face in the field. They often develop silently due to rodent damage, moisture ingress, UV-degraded insulation, or improperly routed cables. If left undetected, ground faults can lead to inverter shutdowns, loss of system yield, or even fire.

What happens if you leave a ground fault in a solar PV string?

If left undetected, ground faults can lead to inverter shutdowns, loss of system yield, or even fire. In this article, we'll show you how to locate a ground fault in a solar PV string using only a multimixer, a basic understanding of voltage behaviour, and a method proven in real-world installations.

What happens if an inverter ground fault is unresolved?

However, even when disabled, a ground fault still presents a fire or shock hazard if left unresolved. In some cases, an inverter ground fault warning can be a false positive, or even caused by an internal failure in the device itself. The first step is to confirm whether an actual fault exists.

Do inverters shut down if a ground fault is detected?

Luckily, most modern inverters actively monitor for ground faults and will shut down the system when one is detected. However, even when disabled, a ground fault still presents a fire or shock hazard if left unresolved.