Line Interactive Type Uninterrupted Power Supply System has various protections such as over load, battery deep discharge, battery low, short circuit, reverse battery input high-low cut, over temperature, battery disconnect. The System has various indications such as mains on, output on, battery low, loads on battery overload, battery low trip, mains fuse fail, battery fuse fail, output trip, reverse battery, on static by-pass. The System has voltage input range from 140 to 280 V AC, DC voltage range of ± 20% of rated. The System has input frequency of 50 Hz ± 20 % Hz, no-load shut off on less than 5% of rated load, system overall efficiency better than 80%. The Line Interactive Type Uninterrupted Power Supply System has output frequency of 50 Hz ± 0.1% Hz, output inverter efficiency of better than 90%.