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The hidden hazards of ground faults in PV systems

DC ground faults are the most common type of fault in PV systems and half go undetected. A DC ground fault is the undesirable condition of current flowing through the equipment grounding conductor in the circuits carrying DC power (before the inverter). Ground faults can lead to significant safety issues, such as arc faults and, in the case of high voltage, arc flashes. In addition to a safety hazard, ground faults create a fire hazard as bare metal is heated by short-circuited current.

https://www.fluke.com/en-us/learn/blog/grounding/dc-ground-faults-pv-systems