Solar PV rooftop systems: Lightining protection

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As all solar generators are mounted outdoors, they are exposed to lightning-current-induced power surges. To protect the modules and wiring against such surges, the clearance between (a) module areas that are electrified by the module wiring and (b) lighting rods and down-conductors should be as small as  possible. Moreover, suitable surge diverters (varistors, if possible either sufficiently oversized or equipped with thermal monitoring devices for ageing induced leakage current increases) should be integrated into the solar generator junction boxes (in relatively close proximity to the modules)
between the positive  and negative conductor and ground.

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