Abstract: A power supply system including: a power storage device which is connected to a system power supply and is chargeable and dischargeable; a second load which is connected in parallel to the power storage device; a power generation device which is connected to the second load, generates power, supplies the generated power to the second load, and performs a shutdown process for stopping power generation using power supplied from the power storage device; and a determination device which determines whether or not a remaining amount of power in the power storage device is greater than a shutdown power amount which is an amount of power necessary for the power generation device to perform the shutdown process, in which the power generation device performs, while in operation, the shutdown process or supplying of power to the power storage device according to the determination by the determination device.

Abstract: A fuel cell system (1) includes a fuel cell (7), an electromagnetic diaphragm pump (8), a flow detector (9), and a controller (20). The controller is configured to set the frequency of the AC voltage (applied AC voltage) applied to the electromagnetic diaphragm pump, control the voltage of the applied AC voltage in the set frequency to cause the flow rate of the gas detected by the flow detector to reach a target flow rate; and the controller is configured to newly set the frequency of the applied AC voltage to a frequency at which the voltage of the applied AC voltage becomes smaller than a predetermined voltage when the voltage of the applied AC voltage becomes equal to or greater than the predetermined voltage.