Application of polymer exchange membrane fuel cell stack as the primary energy source in commercial uninterruptible power supply unit

This paper presents construction details of the commercially available uninterruptible power supply system (UPS) in which the PEM fuel cell stack was applied as the primary energy source. Results of components testing as steady state performance of the fuel cell stack used are presented and analyzed in the context of project assumptions. Finally, the results of field tests of the complete UPS unit are presented and analyzed. The designed and constructed uninterruptible power supply with fuel cell module can power any electrical devices up to 300 W for 80 minutes with 33 gram of stored hydrogen.