Voltage : 170 - 270V Single Phase,Frequency : 50Hz +- 1%,Rectifier : Automatic float cum boost charger, CVCC type,Voltage : 230 V + 3% with AVR,Voltage : 230 V + 3% with AVR,Wave from : Sine Wave (with AVR),Inverter Step approximate sine wave,15 min. -10 Hrs. with External Battery