True on-line double conversion design. Sine wave pulse width modulation. IGBT inverter design. Advanced Battery Managemen. Model ... Input Frequency(Utility Mode)/50±0.2%Hz(AC Frequency exceed 46~54Hz)50±0.2% ... /Output Voltage,Frequency,Output Power,Battery,Utility,Inverter,Overload,Fault,BypassCommunication PortRs232/USBInterfaceMonitor of Utility ... .00 38.00 Double Conversion Sine Wave Online UPS