German students build energy trailer for festivals, crises, research

Mechanical engineering students at Dortmund University of Applied Sciences and Arts in Germany have developed the eTrail-Ing, a mobile energy trailer that integrates solar panels, battery storage, and a hydrogen fuel cell to provide off-grid electricity for up to seven days. Designed as a sustainable alternative to diesel generators, the trailer targets applications in remote locations such as open-air festivals, crisis zones, and scientific expeditions. Its modular design allows for flexible use, powering appliances, lighting, communication devices, and refrigeration systems, including a built-in cold storage area capable of maintaining temperatures suitable for drinks, blood reserves, or medicines. The system features nearly 4 kW of fold-out photovoltaic modules, a 2.5 kW hydrogen fuel cell, and a large-capacity battery, along with 230-volt sockets and USB ports. A software monitoring system ensures continuous, safe operation and prevents interruptions in critical functions like cooling chains. The project, supervised by Professor Sönke Gößling, emphasizes student learning through hands