The system is based on the Heliocentris Nexa® 1200 fuel cell module. A highlyefficient DC/DC converter, specially developed for the Nexa® 1200, generates a regulated system voltage of 24 VDC. This, in turn, feeds an inverter, which provides the 230 VAC for the repeater system.

All system components are housed in a special developed outdoor enclosure. An integrated hydrogen sensor system enables a safe operation without supervision. Voltages, currents, temperatures and humidity are recorded in an industrial PC and transmitted through a data interface to a remote monitoring point.

The hydrogen supply takes place through two bundles of 12 bottles with 300 bar, connected in parallel, whose capacity enables continuous operation for approx. 25 days.

The project was realized in a very short time. Over the course of several months – even in poor weather conditions – the autonomous operation was successfully demonstrated in use.