Dimension (DxWxH) : 550 x 435 x 176 mm Weight : 35 Kg Capacity : 2400 VA / 1200 W AC Voltage : 160 ~ 250 V AC Frequency : 50 3 Hz AC Protection : 10 A DC Voltage : 72 V DC INT Battery : 6 x 12 V 7 Ah DC Protection : Fuse INV Waveform : Sinewave INV Distortion : 85% CHG Topology : Switching Regulation CHG Floating Voltage : 81.6 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