A:AnswerThank you for your inquiry. The runtime you will get on this model depends on the connected wattage load. For example, on a 300W load you will get 16 minutes of runtime. The load is the total power consumption of all connected devices into the UPS.
http://www.apc.com/products/runtimegraph/runtime_graph.cfm?base_sku=SMC1000&chartSize=large