More and more vehicles are using hydrogen as the fuel of the future. Here, the energy content in gaseous hydrogen is converted into electrical energy by a fuel cell. To do this, it must be stored at up to 800 bar, depending on its use. The advantages of hydrogen as an energy carrier in vehicles are its rapid refueling and its long ranges. With an electrolysis capacity of 1 MW, about 20 kg of hydrogen can be produced per hour. This is sufficient to drive about 2,000 km with a fuel cell passenger car. Such passenger cars have tanks with a capacity of 5-6 kg, which can be refueled in max. 5 minutes. For commercial vehicles, a hydrogen combustion engine can also be considered. Such engines are particularly suitable for construction vehicles, which require high performance in short periods of time.