How to make UPS / Inverter Easily at Home

This is a complete guide to make and assemble 12 volt uninterruptable power supply UPS inverter. This ups making guide is comprehensively described in urdu / hindi. I made this ups in very low cost as i used a scrap ups transformer which cost less as compare to original. Then i completely check inverter transformer primary and secondary windings for any faults. This ups is intelligent microcontroller based circuit which is packed of features like very low millisecond transfer time, intelligent battery charging, trickle charging, battery low voltage protection, battery over charging protection, overload protection, low mains voltage charging etc. The transformer used in this ups is pure copper winding. This ups is ideal for four fans and four energy saver bulbs. It can carry 600 watts of load and it is rated at approximately 1000VA.