Dimension (DxWxH) : 550 x 435 x 87 mm Capacity : 1600 VA / 800 W AC Voltage : 160 ~ 250 V AC Frequency : 50 3 Hz AC Protection : 7 A DC Voltage : 48 V DC INT Battery : 4 x 12 V 7 Ah DC Protection : Fuse INV Waveform : Sinewave INV Distortion : 85% CHG Topology : Switching Regulation CHG Floating Voltage : 54.4 V Transfer Time When AC In Loss : 0 ms Static Transfer Switch : 2 ms From Inverter to Bypass Zero Crossing Bypass to Inverter Back up Time : 10 min BZR AC In Abnormal : Intermittent Sound With 4 Seconds Interval BZR Battery Low : Intermittent Sound With 1 Second Interval Operation Temp : 0 ~ 40 C