To provide a power supply device which uses other different power sources concurrently, and to make it possible to store hot water generated by heating cold water using electricity supplied from the power supply device and supply the stored hot water to a hot water supply apparatus.

A power supply device 200 is equipped with a plurality of inverters (a first inverter 208 and a second inverter 218) for performing switching control of electric powers supplied from a plurality of power sources (a commercial power supply 202 and a solar battery 212), and exclusively supplies electric power to a heat pump hot water supply apparatus 100 in a time-division manner from the plurality of inverters.