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Thread: Charging multiple batteries

  1. #1
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    Nov 2012
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    Default Charging multiple batteries

    I am looking for a way to maintain 3 batteries simultaneously while my boat is in storage. I have 1 12v cranking battery and 2 deep cycle marine batteries wired in series that power a 24v system. Currently, I use a 12v charger to charge each battery individually.

    I am looking for a way to maintain all 3 batteries at the same time utilizing a single charger. What are my options?


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  2. #2
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    3 bank on board charger. Something like below

    https://www.cabelas.com/product/PROF...3.uts?slotId=9

  3. #3
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    Yep

  4. #4
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    Dec 2010
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    3 bank battery charger/maintainer.

    https://www.cabelas.com/product/PRO-...E&gclsrc=aw.ds

  5. #5
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    Quote Originally Posted by SChunter1991 View Post
    I am looking for a way to maintain 3 batteries simultaneously while my boat is in storage. I have 1 12v cranking battery and 2 deep cycle marine batteries wired in series that power a 24v system. Currently, I use a 12v charger to charge each battery individually.

    I am looking for a way to maintain all 3 batteries at the same time utilizing a single charger. What are my options?


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    Buy a 3- bank onboard charger

  6. #6
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    Buy a 3 bank onboard charger

  7. #7
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    If I were you I'd buy a 3 bank onboard charger

  8. #8
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    In all seriousness, the ones mentioned above are great. I bought it off amazon a while back and love it.

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

  9. #9
    Join Date
    Nov 2012
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    Thanks for the quick responses. With a 3 bank charger do I have to remove the lead that connect the 2 12v batteries in series? Or can the charger be set to charge 12v on one bank and 24v on another?
    Also, space is a constraint for me. I don’t room for an onboard charger like the one above. What are the alternatives to an onboard charger?


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  10. #10
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    Jul 2013
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    3 bank minnkota

  11. #11
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    have you considered a 3 bank charger?

  12. #12
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    Take it to KRT.
    The strongest reason for the people to retain the right to keep and bear arms is,
    as a last resort, to protect themselves against tyranny in government.

    Thomas Jefferson

  13. #13
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    Quote Originally Posted by SChunter1991 View Post
    Thanks for the quick responses. With a 3 bank charger do I have to remove the lead that connect the 2 12v batteries in series? Or can the charger be set to charge 12v on one bank and 24v on another?
    Also, space is a constraint for me. I don’t room for an onboard charger like the one above. What are the alternatives to an onboard charger?


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    3 bank charger = 3 sets of 12v positive and negative. 2 are for deep cycle and 1 is for start. No 24v conversion or anything

  14. #14
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    3 bank is all I got.
    Gettin old is for pussies! AND MY NEW TRUE people say like Capt. Tom >>>>>>>>>/
    "Wow, often imitated but never duplicated. No one can do it like the master. My hat is off to you DRDUCK!"

  15. #15
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    Get a 2-bank charger for the trolling motor batteries and a battery maintainer for the starting battery.
    Ephesians 2 : 8-9



    Charles Barkley: Nobody doesn't like meat.

  16. #16
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    I don't think anyone has recommended this yet, so I will. 3 bank charger.
    I take an PLB in the shower with me. Can't ever be too safe.

    Whats it like to live w/o the Internet? Not bad, I get photos of your mom thought the mail....

    "I'd like to know more about this. Someone give cottontop a bump of coke."
    Sportin' Woodies

  17. #17
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    Quote Originally Posted by SChunter1991 View Post
    Thanks for the quick responses. With a 3 bank charger do I have to remove the lead that connect the 2 12v batteries in series? Or can the charger be set to charge 12v on one bank and 24v on another?
    Also, space is a constraint for me. I don’t room for an onboard charger like the one above. What are the alternatives to an onboard charger?


    Sent from my iPhone using Tapatalk
    No, you can charge the batteries just as they are wired.....1 12vt and 2 wired in series.

    You can use the on board charger without it actually being on board. Mount it overhead or on a wall on your building .....just replace the connectors with alligator clips

    Sent from my moto z3 using Tapatalk
    Last edited by Catdaddy; 05-30-2019 at 01:30 PM.

  18. #18
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    You could go with a 3 bank onboard charger
    867-5309

  19. #19
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    even a caveman could do it.

    7A527348-3325-4733-9E61-747A1E1BEAA1.jpg

  20. #20
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    Have you considered a 3 bank charger?

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