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If you are running the fridge, charging phone/laptop and LED lighting off the rear battery then the 1225 would be enough. A 1240 will charge quicker though. Have you decided what do you want to use the battery for? It might just be cheaper and simpler to put a wet cell under the bonnet with a normal VSR. It would save heaps of money and still be the most versatile option as you can use as starter, help with winching, big amp etc.
I have a redarc 1220 and Dekka AGM battery under the bonnet. It has worked well for the last couple of years but I am noticing the battery does not seem to hold a charge as well as it used to. Will monitor the situation, but unless I get 5-6 years out of the battery then it was not a cost effective way to go. I would have been a lot better off staying with the VSR and lead acid battery set up that the car had when I bought it.
Last edited by Rock Trol; 11th January 2015 at 05:07 PM.