Uninterruptible power supply effective power 1 000 w apparent power 1 440 va outputs 8 x nema 5 15r inputs 1 x nema 5 15p nominal voltage 120 v bridging time 7 min voltage waveform sine wave frequency range 47 63 hz yield in 981 input voltage 82 144 output voltage 120 v battery technology lead acid number of batteries 1 battery charging time 3 h protective measures alarm function operating temperature 0 40 c permitted humidity when