Patent ID: 8461716

Claim:
A photovoltaic power generating device, comprising: a plurality of photovoltaic strings; a current collecting box serving to collect electric power from the plural photovoltaic strings; and a power conditioner supplied with the electric power from the plural current collecting boxes, and having an inverter for converting the electric power into the alternating current power, wherein the current collecting box includes: a current collecting box side detector for detecting a ground fault in each of the photovoltaic strings; a current collecting box side switch provided in correspondence to each of the photovoltaic strings and interposed between the photovoltaic string and a connecting cable; and a current collecting box side control unit applying an on/off control to the switch according to a detection result supplied from the detector, and wherein the power conditioner includes: an inverter side detector for detecting a ground fault in a connecting cable between the current collecting box and the power conditioner; an inverter side switch interposed between the connecting cable and the inverter; and a power conditioner side control unit applying an on/off control to the inverter side switch according to a detection result supplied from the inverter side detector.