POWER SUPPLY SYSTEM FOR VEHICLE AND METHOD OF CONTROLLING SAME

A power supply system comprises a chargeable power storage device (110); a charging device (200) configured to perform external charging for charging the power storage device (110) using alternating-current (AC) power supplied from an external power supply (260); an air conditioner (160) receiving electric power from the charging device (200) and the power storage device (110) and air-conditioning a compartment in a vehicle (100); an auxiliary machinery load (190); and an ECU (300). The ECU (300) controls at least one of the charging device (200) and the auxiliary machinery load (190) so as to increase the electric power output from the power storage device (110) in a case where overcharging of the power storage device (110) is expected when the air conditioner (160) is intermittently operated during external charging.