Abstract: A process for operating a fuel cell system (2), which is arranged in a vehicle (1) having a tachograph (6) and an internal combustion engine (3), and used for power supply of at least one electrical component (10) of the vehicle (1) with the internal combustion engine (3) switched off. With the fuel cell system (2) switched off, the control device (4) receives from the tachograph (6) a foreseeable break start time of an operating break following a drive mode, which is legally prescribed and/or planned by the driver of the vehicle (1), at which the internal combustion engine (3) is switched off. The control device (4) determines a start time such that a start procedure of the fuel cell system (2) ends at the break start time and the fuel cell system (2) is ready for operation, when the fuel cell system (2) is started at the start time.

Abstract: A process for operating a fuel cell system (2), which is arranged in a vehicle (1) having a tachograph (6) and an internal combustion engine (3), and used for power supply of at least one electrical component (10) of the vehicle (1) with the internal combustion engine (3) switched off. With the fuel cell system (2) switched off, the control device (4) receives from the tachograph (6) a foreseeable break start time of an operating break following a drive mode, which is legally prescribed and/or planned by the driver of the vehicle (1), at which the internal combustion engine (3) is switched off. The control device (4) determines a start time such that a start procedure of the fuel cell system (2) ends at the break start time and the fuel cell system (2) is ready for operation, when the fuel cell system (2) is started at the start time.