To enable a photovoltaic power generating set to make uninterruptible power feed to an important load, without causing instantaneous interruptions caused system power failure, etc., by effectively utilizing the power generated from a solar battery as much as possible.

A photovoltaic power generating set is provided with an inverter (first inverter) 17 connected with a solar battery 15, another inverter (second inverter) 22 connected with a rectifier 19 and a battery 20, and an input bridging switch 23. The set is also provided with an AC output circuit 24, which always feeds the AC power outputted from the inverters 17 and 22 to a load 28 and a control circuit 30, which controls the operation of the inverters 17 and 22 and the opening/closing of the switch 23. The control circuit 30 is provided with a normal operation control means, which operates the inverter 17 by controlling the tracking of the maximum power point of the solar battery 15 and the inverter 22 by performing CVCF control through the means of opening the switch 23, and an insufficient operation control means which operates the inverters 17 and 22 by performing CVCF control by using the solar battery 15, rectifier 19, and battery 20 as a common DC power source, due to the power feed becoming insufficient due to the CVCF control.