modified sine wave HBC-P type Inverter and Charger HBC-P500VA,1KVA,1.5KVA,2KVA,3KVA,4KVA,5KVA,7.5KVA,10KVAParameters:Output voltage: ... 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