... ~270VACPhaseSingle-phaseFrequency50-60HZAdjusting time≤1S(input voltage varies 10%)Max of Capacity500VA,1000VA,1500VA,2000VA,3000VA,5000VA,8000VA,1000VAEfficiency≥90%Stabilization precision220V ... humidity≤90°CWave form distortionNo additional wave form distortionOutput over-voltage protectionAC248±4v AVR Relay type Voltage Regulator AVR-3000VA