Output:Va Rating: 0.6O.8kva 11.5kva 2kva 34kva 5kva , Waveform: Pulse Width Modulated Quasi WavePure Sine Wave, Frequency Regulation: 50hz As Line Input 50hz +-1hz Under Battery Mode. Battery:Type: 15mins To 8hours, Back-Up Time: 13.8v27.6v41.9v55.2v83.8v, Max Charging Voltage: 4-5hours. Led Indication Buzzer: Main�s On, Inv. On, Batt. Low, Trip, Batt Low, Overload, Shutdown.