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A generator is not possible. We could reduce the light wattage or use led's like Sharpend said. I can add more batteries to increase the amount of power, this is something that can be played with once we have the relay sorted. 

They are 400watts and on a Pir all night. 

Its a security system (camera's x4 and x4 security lights) at a office. We want a UPS to power the system encase the mains powers goes down/gets cut.  

It's a complete system with 4 camera's plus security lights. I initially went down the ready made ups systems but quick quickly decided against as they won't last. So just power it all from the battery none stop? Wouldn't this greatly drain the battery enough if I have it on a maintaining charge

Hi Guys, Thanks your your quick replies. I've toyed with the idea of buying one ready made for a while now and decided against this mainly because they are mostly designed to allow enough time to save your work on a computer before it shuts down (5-10 minutes) and can be very expensive for any...

Hi all, I'm currently in the process of building a ups to back up a cctv system. I have been using this as a guide http://www.instructables.com/id/Super-Simple-Super-Cheap-DIY-UPSCCTV-system-fro/ I've got as far as the relay and I'm now stuck as this guide does not explain it very well (not at...