A power supply system comprises: PV DC/DC converter which converts power supplied from the solar panel; EV DC/DC converter which can convert power supplied from the house side bus and supply the power to an electric vehicle; an in-house relay; a fast charging and discharging relay; a joint part; and a controller which turns the in-house relay off and at the same time turns the fast charging and discharging relay on to cause an aggregated power of the power converted by the EV DC/DC converter and the power supplied to the joint part via a fast charging and discharging route to be outputted to the electric vehicle via the electric vehicle wiring.
