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Morning guys, thanks for all your advice. I think I'm going to go scrap the mains and relay and go with the following - a inverter and deep cycle battery with a battery charger connected on maintain to keep it topped up. Regarding the inverter how do I work out what size is needed? Also would a...

Hi Guys, Thank you for your reply and advice. Apologies for the basic questions but this is a bit like learning a foreign language to me! If I do not use the relay I would just have the inverter connected to my deep cycle leisure battery with the battery charger on constant maintenance mode, is...

Hi Bernard, Thanks for your advice. I've slightly adapted my ups as I thought the same. I've gone with a deep cycle leisure battery instead...much safer and will last a lot longer. Do you have any advice regarding the relay? Thanks. Joe

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...