Uninterruptible power supply effective power 640 w apparent power 1 000 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 54 min bridging time at minimum load 1079 minutes voltage waveform sine wave frequency range 47 63 hz input voltage 160 286 output voltage 230 v battery technology lead acid number of batteries 1 battery charging time 2 h protective measures alarm