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My living area is notorious for frequent blackouts and I do hope to fix a security camera system I wanted a UPS that can last for long. What I did: 1.Asked My favorite techie friend about my idea. After the discussion his answer was it can be done if I can find a solution to the heat. 2.Search the Youtube & blogs. Youtube had several videos. Almost all of them from USA and the question raised was can I use the Chinese UPS circuit as they are using their old UPSs. 3.Accidently met a man who makes inverters in small scale and he told me that "Sir, relay 5k thiena circuit eka rath wenawa wediyi, relay 2k thiena eka rathwenne ne.Ekak thienawanam wede lesiyenma karatheki". When I check my circuit boad onece in the home I found that my board has only 2 relays. And it was the biggest green light. If one of you reading this post know the reason behind this please let me know. The guy who told me this knows only that middle 2 relays are over heating. Then I started my project...