Fuel cell system and control method of the same

A fuel cell system comprising:

• a fuel cell;
• a plurality of tanks that store a fuel gas used for power generation in the fuel cell;
• a supply channel having
• first channels respectively connected with the tanks, and
• a second channel merged with each of the first channels and connected to the fuel cell;
• first on-off valves provided in each of the first channels, the first on-off valves being configured to switch opening and closing of the first channels, the first on-off valves each including a valve body, the first on-off valves being configured to seal the first channels with a differential pressure between a first side and a second side of the valve body;
• a second on-off valve provided in the second channel, the second on-off valve being configured to switch opening and closing of the second channel;
• and
• a controller configured to control electric power supplied to the first on-off valves and the second on-off valve so as to control opening and closing of the first on-off valves and opening and closing of the second on-off valve, wherein
• in a state where the second on-off valve is closed, the controller supplies, in response to a start-up command for starting up the fuel cell system, first electric power to at least one first on-off valve out of the first on-off valves, the first electric power being used for opening the first on-off valve against a first differential pressure, and supplies second electric power that is smaller than the first electric power to the first on-off valves other than the at least one first on-off valve, the second electric power being used for opening the first on-off valves against a second differential pressure that is smaller than the first differential pressure.