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Thread: Charging a battery

  1. #1
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    Default Charging a battery

    How many amps does it take to charge one 12v battery overnight? I知 needing to get another charger, and I don稚 really ever use the high voltage charging after a days use. I知 wondering if a 3 amp charger will be plenty to use for recharging my battery?


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  2. #2
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    I think the lower amp chargers "will" charge the battery "overnight" .... but, it may well take "all night". I put mine on a 10 amp charger and it's ready to go in a few hours.

    Might also depend on what size battery you have ... and what type charger. I'm charging a Series 29 Deep Cycle battery with a Minn-Kota 2bank onboard charger @ 10a per bank. (the other bank I use to charge my other series 29 DC battery or my series 24 starting battery)
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    Don't know about a 3 amp but a 5 amp per lead has always served me well. Never a problem.
    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va

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    Depends on the battery size/reserve capacity, how much you typically discharge it, and how much time you have to recharge before your next use.

    If you typically run a 100 amp-hour battery down to 25% then it would take 25 hours to recharge it with a 3 amp charger. For people who fish long hours multiple days in a row, they don't have 25 hours between hitting the water....for that same scenario a 10 amp charger would finish charging in 7.5 hours.
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  5. #5
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    I use a 5amp charger, charges my 3 battery's overnight. It's a 3 bank on board charger.
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    5 amps minimum IMO.

    I have used some slower trickle chargers and they took almost a whole day to charge. I have a 2 bank 5 amp charger now, and it's usually done in a few hours.
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    I use a Minn kota "Precision" 212 . I had it before going to a 24 vt. trolling motor . I still use it to charge trolling motor batteries. I have never seen it not ready to go in 6 hrs . This is 6 amp, per bank .
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  8. #8
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    Length of time to charge batterys depends on 3 things
    1. Group size and amp hr rating of battery
    2. Amp output per bank of charger
    3. Percent of discharge of battery being charged.
    I have spent most my life fishing........the rest I wasted.
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