True on-line double conversion design. Sine wave pulse width modulation. IGBT inverter design. Advanced Battery Managemen. Model No.LS ... 54Hz)50±0.2%Hz(Battery Mode)Output WaveformTrue Sine WaveHarmonics Distortion<3% (Linear Load,Full Load)/<5 ... StatusInput/Output Voltage,Frequency,Output Power,Battery,Utility,Inverter,Overload,Fault,BypassCommunication PortRs232/USBInterfaceMonitor of Utility Fault, ...