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  1. #11
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    Quote Originally Posted by TQA View Post
    However if I were to leave them connected and not charge them the 'see saw' effect kicks in and in a week or so I would have flat batteries.
    I'm glad nobody has told my batteries that and consequently it doesn't happen even after a couple of months.

    Seriously it isn't a problem provided both batteries are healthy. If one gets an internal short it will drain the other.

    Many military and commercial aircraft use sealed lead acid batteries in parallel and that isn't a field where you take chances.

  2. #12
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    Aug 2003
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    Quote Originally Posted by Troubadour View Post
    I'm glad nobody has told my batteries that and consequently it doesn't happen even after a couple of months.

    Seriously it isn't a problem provided both batteries are healthy. If one gets an internal short it will drain the other.

    Many military and commercial aircraft use sealed lead acid batteries in parallel and that isn't a field where you take chances.
    I've left mine fully charged, 6 off 220AH in parallel for over 3 months without trickle charge and without problems.

  3. #13
    Chris_Robb's Avatar
    Chris_Robb is offline Registered User
    Location : Haslemere/ Leros Greece
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    Quote Originally Posted by Troubadour View Post
    I'm glad nobody has told my batteries that and consequently it doesn't happen even after a couple of months.

    Seriously it isn't a problem provided both batteries are healthy. If one gets an internal short it will drain the other.

    Many military and commercial aircraft use sealed lead acid batteries in parallel and that isn't a field where you take chances.
    Having 2 100AH in parallel rather than 1 200AH (which in theory is better), gives you a safety margin if one fails; just isolate it. At least you have something left.

  4. #14
    sarabande's Avatar
    sarabande is offline Registered User
    Location : up on the moors.
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    May 2005
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    Quote Originally Posted by TQA View Post
    However if I were to leave them connected and not charge them the 'see saw' effect kicks in and in a week or so I would have flat batteries.
    That's in theory, but somehow it's not how it works in practice....
    I think, therefore I am. I am, therefore I sail.

  5. #15
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    Apr 2005
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    Quote Originally Posted by Chris_Robb View Post
    Having 2 100AH in parallel rather than 1 200AH (which in theory is better), gives you a safety margin if one fails; just isolate it. At least you have something left.
    And also won't give you a slipped disc when you lift it out. I'd go for 3 x 75aH just for manual handling reasons.

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