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There are mission critical equipment configurations where the installation window is available for only a short duration. The successful completion of the installation requires permission from the client to interrupt the configuration, skilled technical personnel, pre tested equipment units to be installed and a planned outage schedule. This paper describes the performance testing of 50 each 1 KVA UPS systems with detached one-hour battery installation at twenty different locations, 1000 total installations across the USA. Failure of the UPS or battery after the installation was not acceptible.