The Eaton 9155 UPS (formerly the Powerware 9155 UPS) is a single-phase, double-conversion online UPS. Providing 5,500 watts per square foot with a 0.9 output power factor, the 9155 UPS helps get the most value out of your floor space and data center operating budget. This UPS offers endless opportunities to build out the backup power system you need with an optional maintenance bypass switch, network card and relay communications outputs, and Eaton’s patented HotSync technology that makes it easy to add redundancy or capacity.