modified sine wave HBC-P type Inverter and Charger HBC-P500VA,1KVA,1.5KVA,2KVA,3KVA,4KVA, ... % automatic stabilized frequencySwitching type: auto switch in 30msOutput wave form: modified sine waveEfficiency: ≥0.7should use with battery . modified sine wave HBC-P type Inverter and Charger