2 12 volt batterys or 2 6 volt

brulaz wrote:
According to Trojan, their T-1275 is a "12V Deep-Cycle Battery", and the SCS225 is a "12V Marine/RV Deep-Cycle Battery".

While all this forum theorizing makes for interesting reading it seems to me that if the goal is a battery designed for recreational vehicle application one would logically turn to a manufacturer that designs and builds these products for the most appropriate recommendation. Go to the Trojan Marine / RV Webpage, scroll down to the bottom, download the Marine / RV Brochure, and one doesn't even find the T-1275 listed as an appropriate solution. Indeed, if one ignores the many variations of any given battery that is listed as appropriate for RV use there really aren't that many different choices ... but interestingly, of ALL of those choices recommended by Trojan only one - the 12 volt SCS series - is offered with the terminal that makes the most sense for recreational vehicle use - the DWNT (double wing nut terminal) which allows easy connection of many cables to the batteries. Coincidence? ... hardly, as this to me is a clear indication that Trojan believes their SCS series is the most suitable, designed specifically for recreational vehicle use by engineers who understand far better than any of us the many considerations in battery design. Yes, the popular T-105 is also considered suitable but it's also listed in the Golf and Utility Vehicle brochure along with the T-1275, making these universal use deep cycle batteries which are NOT offered with recreational vehicle specific DWNT terminals. My point - who are we to argue with Trojan? :h If it weren't for the fact I can get a deal on a pair of RV Care branded Deka 12 volt Group 31s for half the cost I'd have no hesitation in accepting Trojan's recommendation that a pair of Trojan SCS225s would be an excellent choice for my intended use with my own travel trailer. :D