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Thread: Running 12 volt batteries in series

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    Default Running 12 volt batteries in series

    I have a 12 volt trolling motor ,and I was wanting to see if any one else out there ran there 12 volt trolling motor in series,to extend the run time of there trolling motor for more hours of fishing? Is there any negative effects of doing this??

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    Barnacle Bill is offline Super Mod and 2014 Crappie.com Man of the Year * Crappie.com Supporter
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    If you wire them in series you will have 24V. You motor will run very very fast until it burns up. If you wire them in parallel it will double your run time.
    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va


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    So, you can run them in series if you have a 24 volt motor?? Can you also run them in parallel? Would there be any advantage?? Again, if your motor is 24 volt. Thanks
    BSRRofl

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    Quote Originally Posted by BigSandyRookie View Post
    So, you can run them in series if you have a 24 volt motor?? Can you also run them in parallel? Would there be any advantage?? Again, if your motor is 24 volt. Thanks
    With the newer motors you wire them for series or parallel. But to answer your question, yes. If you have a 24 volt motor and 4 batteries you could set up a series/parallel installation.
    Fair Winds and Following Seas

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    Quote Originally Posted by papermouthking View Post
    I have a 12 volt trolling motor ,and I was wanting to see if any one else out there ran there 12 volt trolling motor in series,to extend the run time of there trolling motor for more hours of fishing? Is there any negative effects of doing this??
    Hook hot to hot, and ground to ground and they'll be in parallel, which is what you want for 12v. And yes, they'll give you twice the run time.

    Mine stay wired this way all the time. When I charge them my charger sits on a shelf in the boat barn and the leads reach the batts so I leave them connected in parallel and hook the charger to just one battery (+ & -) and they both charge together. Just remember to keep a check on the fluid level.
    Health nuts are going to feel stupid someday, lying in hospitals dying of nothing.

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    will the onboard charger work the same for 12 volt parallel when hooked two only one battery

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    Quote Originally Posted by blueball View Post
    will the onboard charger work the same for 12 volt parallel when hooked two only one battery
    Could you explain that a little more?
    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va


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    Quote Originally Posted by IBNFSHN View Post
    Could you explain that a little more?
    as long as both batteries are connected parallel(neg. to neg. and pos. to pos.),what ever goes in to 1 goes to the other.

    when you hook 2 batteries in series,the voltage doubles,but amps.stay the same

    in parallel,the amps double and voltage stays the same

    so in theory-a 12v motor connected to 2 batteries in parallel will give you the total running time of both amp ratings added

    a 24v motor with 2 batteries in series will only give you the running time of the average of the 2 batteries(both amp ratings added together and divided by 2)

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    Yes, I did it for yrs w/12v in parallel. I'd fish Rayburn for 4-5 days (camping) without a charge. It does extend your troll/fishing time.

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    Both Batts Should Match In Age And Amp Ratings

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