Fuel cell system

A fuel cell system,

• wherein the fuel cell system comprises a stack group, a fuel tank for storing a fuel gas containing hydrogen, and a controller;
• wherein the stack group includes two or more fuel cell stacks that are operable independently;
• wherein the fuel gas is filled into the fuel tank, and when the fuel gas stored in the fuel tank is supplied to the stack group at a first activation of the fuel cell system after the filling, the controller supplies the fuel gas only to a first stack in the stack group and causes the first stack to generate power;
• wherein, after the power generation by the first stack, the controller determines whether or not an impurity is contained in the fuel gas filled into the fuel tank;
• wherein, when the controller determines that an impurity is contained in the fuel gas filled into the fuel tank, the controller determines whether or not the impurity is a poisoning substance;
• and
• wherein, when the controller determines that the impurity is the poisoning substance, the controller prohibits the supply of the fuel gas to the fuel cell stack(s) other than the first stack.