Fuel cell modules power the Evolution uninterruptible power supply (UPS) system. The UPS system comes in a rack-mounted package with 3kVA of power that provides 4 hr to 24 hr of backup, depending on the size and quantity of fuel storage. It’s designed for installation in 19-in. racks, and it comes with electrical connections and N±1 redundancy capability. Each 1kW module has ±24VDC output, and produces 40A of current. The line-interactive UPS system uses 3.5-in. of rack space and weighs 80.4 lb. It includes six standard 15A NEMA receptacles, USB, serial, and SNMP/Web connection.