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Thread: Addendum to my other "Adding a second battery.........." post

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    Seasoned Camper Rgpracer's Avatar
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    Addendum to my other "Adding a second battery.........." post

    Sorry, couple extra questions.......do you always wire to use both batteries simultaneous and charge at same time or should I put an isolator (selector switch) in to isolate batteries?

    Sorry and thanks
    Ray
    Msgt Ray Parker (Ret)
    2020 GD 230RL
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    Seasoned Camper huntindog's Avatar
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    Are you adding a new battery to your existing one? If so, then the selector switch is a good idea. If you are geting 2 new batteries, then I would not install one.Reason is an old battery will drag a new one down. If you start with a matched set, then keep them that way by using them as a set. Batteris age from time, and cycles.
    This is for regualar lead acid batteries. Other types of batteries is not considered in this aswer.
    2021 398M
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    Site Sponsor RV Sailor's Avatar
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    No switch. Batteries should be the same. Best to build the largest bank you can.

    I’ve copied a discussion on one of the sailboat forums I am part of , where 1 large house bank is preferred over two small ones

    https://forums.sailboatowners.com/th...e-bank.184137/
    Donna and Dave
    Annapolis, Maryland
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    Seasoned Camper Rgpracer's Avatar
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    Quote Originally Posted by huntindog View Post
    Are you adding a new battery to your existing one? If so, then the selector switch is a good idea. If you are geting 2 new batteries, then I would not install one.Reason is an old battery will drag a new one down. If you start with a matched set, then keep them that way by using them as a set. Batteris age from time, and cycles.
    This is for regualar lead acid batteries. Other types of batteries is not considered in this aswer.
    Adding a second battery if cca's are ok, so good on selector.
    Thanks

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