Abstract: A photovoltaic generation system includes: a solar cell array that includes a plurality of solar cell modules; a collector portion that collects power from the solar cell array; a power control portion that is connected to the collector portion and includes a power conversion portion which converts first power from the solar cell array into second power; a first electric wiring that connects the collector portion and the power control portion to each other; a first connection terminal that is supplied with the first power from the solar cell array; and a first switch portion that shuts off output from the solar cell array for the power conversion portion; wherein an alternative power control portion is connectable to the first connection terminal.

Abstract: A photovoltaic power generation system includes: a plurality of units, each of the units being formed with a string, which is a series-connection body of a plurality of solar cell modules, or with a solar cell module; a plurality of connection cables to which the units are each connected such that the units are parallelly connected to each other; a junction box to which each end of the plurality of connection cables is connected; and a failure detection section that performs failure detection and outputs a detection result on a unit-by-unit basis, the failure detection section being located outside the junction box.

Abstract: A photovoltaic power system comprising: a plurality of photovoltaic power units each of which includes: a solar battery unit in which high-voltage output solar battery modules are connected in parallel with each other; and a conversion portion that converts a direct-current voltage output from the solar battery unit; and at least one transmission line which is disposed in parallel with the plurality of photovoltaic power units and to which each of the plurality of photovoltaic power units is connected.