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norwestie's avatar
norwestie
Explorer
Apr 10, 2018

House battery capacity?

My Tour has four Group 29 6 volt batteries that need replacing. Costco carries a Group 27, which is nearly the same size but has a reserve capacity of 160 vs 210 for a Group 29. Since we have never dry camped nor do we plan to, would the lesser battery set work well for us?
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  • theoldwizard1's avatar
    theoldwizard1
    Explorer II
    Apr 10, 2018
    The most common size of 6V batery is GC2 which is actually smaller than a Group 27. A pair of GC2 batteries (required to get 12V) should give you around 220AH. Four of them (2 in series and then those in parallel with 2 others) should be about 440AH.

    If your batteries specify a Cold Cranking Amperage (CCA) or a Marine Cranking Amperage (MCA) they are likely not true deep discharge batteries and will have a shorter life when used as a "house" battery.

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