This project, sponsored by the German Federal Ministry for Economic Affairs and Energy and implemented in cooperation with a medium-sized enterprise from Baden-Wuerttemberg, aims to develop a PEM fuel cell system in the power range of 1 kWel. This PEM fuel cell system will be designed for a grid-independent power supply and it will use the fuels LPG and bio-ethanol, which are not tied to pipelines. These systems can be used in a variety of fields, such as grid-remote power supply, on-board power supply, range extenders for battery-powered vehicles and domestic energy supply (stand-alone solutions). In addition to the flexible use of fuels, the unique selling point of the development is the closed water circuit. The water required in the gas processor for steam reforming is fully recovered in the process, meaning that no external water needs to be supplied. The system is designed in such a way that the process heat can be utilised in a heating circuit or radiated into the environment via radiators if there is no heat sink available. The electrical interface is suitable to charge different types of batteries (Li-ion, lead and nickel-metal hydride) at different voltage levels (24 V / 48 V). The fuel cell system prototype is already almost a finished product in terms of structure and level of automation. It weighs about 80 kg and measures approximately 99 x 62 x 35 cm (HxWxD). The system has been undergoing tests since 2014. All essential system specifications have been successfully demonstrated in practical tests.