POWER SUPPLY SYSTEM, CONTROL METHOD, AND PROGRAM

A power supply system includes a fuel cell, a first voltage converter that performs voltage conversion on an output voltage of the fuel cell, a power storage device, a second voltage converter connected in parallel to the first voltage converter with respect to a load to perform voltage conversion on an output voltage of the power storage device, and a controller. The controller performs control to cause the fuel cell to generate electric power less than electric power to be consumed by the load after the fuel cell has started up and before electric power is supplied to the load and to charge the power storage device with the electric power generated by the fuel cell, and then performs control to start supply of electric power from the power supply system to the load.