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try ur local market......u ll get wats called an ups board fully assembled (only pcb board) ....if u do then u can easily assemble the components like ur own high power battery stuff like that..... here i am talking 220V 600-1000VA inverter cos it is realy complex and hard to build(pcb ) ... if some thing goes wrong u ll never be able to rectify it......or if u want 12W emergency lighting system...then u can easily build it... u ll get it at www.discovercircuits.com