FUEL CELL SYSTEM WITH TWO FUEL CELL UNITS WHICH CAN BE OPERATED INDEPENDENTLY FROM EACH OTHER

The invention relates to a fuel cell system () having at least two fuel cell units () that are respectively designed to be operated independently from each other, wherein the fuel cell system () is designed to provide an amount of heat for activating a second fuel cell unit () of the at least two fuel cell units () from waste heat of a first fuel cell unit ().