Offline Uninterruptible Power Supply System functions on a dual mode in charging the batteries in the absence of main supply and in the presence of main supply and it regulate the output voltage and work as a normal inverter. The Uninterruptible Power Supply System offers additional line conditioning to provide upgraded power protection for loads and batteries. The Uninterruptible Power Supply System regulates and regenerates power disturbances stabilizing and continuously suppressing filters. Offline Uninterruptible Power Supply System is mainly used for providing protection against corruption of valuable data, interruption in web access, component failure, errors and shutdown of computers, drive and system crashes or any other damage due to power problems.