... sine wave, applying to capacitive, inductive and nonlinear mixed-load,with superior load capacity,Perfect protection fuction:overload, short circuit, low ... %Frequency50HZ±1%Wave formPure sine waveTHD≤3%Protection functionoverload,short circuit,low battery voltage,high/low AC mains voltageOverload ... (output voltage from small to large for 3 seconds)Man-machine interfaceLCD input phase voltage/frequency/ ...