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if I want to increase the number of batteries on my RV from two to four (because of an inverter installation), is it necessary to start with all new batteries? They will all be six-volt batteries hooked together to produce 12 volts. --Len Daddona Dear Len, in some cases it is not necessary to start with all new batteries, but it usually is always recommended. In a best case scenario, it is most advantageous when all batteries in the same bank are the same age, the same type and the same amp-hour rating (size). But it really depends on how old the original set is and to what degree the plates have sulfated. Deeply sulfated batteries connected in a series/parallel configuration with brand new batteries may shorten the life and the capacity of the newer ones. Take an extremely close look at the original set. If they are not too old and still in good shape, keep them in series with each other and the new set in series with each other. The two sets can then be wired in parallel to provide double the storage capacity. Gary Bunzer, The RV Doctor, is a well known RV author and the host of RV Roadtrips, the DIY Network cable television show. He is one of the RV industry's most sought after speakers and the host of the popular DVD titled Do It Yourself RV Care. Top of Page Get your FREE RV Travel Newsletter every week - sign up now.
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