Offline ups effective power 300 w apparent power 500 va outputs 4 x iec 320 c13 2 x iec jumpers inputs 1 x iec 320 c14 interfaces usb rs 232 nominal voltage 230 v bridging time 38 min bridging time at minimum load 833 minutes frequency range 47 63 hz input voltage 180 266 battery technology lead acid number of batteries 1 battery charging time 8 h max current 7 a protective measures power failure protection alarm function surge protection