Charging 24V battery with 12V charger

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Mad Dog's picture
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Charging 24V battery with 12V charger

I have a new trolling 24V Min Kota with 2 interstate batteries hooked in series.  I was wondering if I can use my 12V battery charger to charge the whole system at once or if I am going to have unhook the batteries from each other to charge them.

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Just a guess but you should be able to charge two batties at one time??

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I have six batteries in a series and my36v charger is not working how would I charge up these batteries??

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murdock1978 Said:
I have six batteries in a series and my36v charger is not working how would I charge up these batteries??

In your boat? must be a huge compartment.

You might need to run 2, 3 bank chargers.

Neat

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AMF Harley Davidson,anybody have a36v golf cart charger for one??Have already called Garys in Stanley,he had one but I was to late!!

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Mad Dog Said:
I have a new trolling 24V Min Kota with 2 interstate batteries hooked in series.  I was wondering if I can use my 12V battery charger to charge the whole system at once or if I am going to have unhook the batteries from each other to charge them.

Just get a 2 bank on-board charger.  Get her hooked up and all you have to do is plug her in at the end of the day.  They are slick.

"Diligence is the mother of good luck."

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All by:  Benjamin Franklin.

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You don't have to unhook them, but you'll have to manually hook them up individually and charge them one at a time.    Be sure to hook up the polarity of each battery properly when you change them one at a time.  Its easy to get mixed up bacause your two 12 volt batteries are hooked in series, so ignore the color of the cables and ONLY look at the polarity marks by the battery. posts themselves.
Sooner or later you'll get tired of doing this and invest in a 2 or 3 bank charger so you can plug it in and forget about any hassles with it.

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bobkat Said:
You don't have to unhook them, but you'll have to manually hook them up individually and charge them one at a time.    Be sure to hook up the polarity of each battery properly when you change them one at a time.  Its easy to get mixed up bacause your two 12 volt batteries are hooked in series, so ignore the color of the cables and ONLY look at the polarity marks by the battery. posts themselves.
Sooner or later you'll get tired of doing this and invest in a 2 or 3 bank charger so you can plug it in and forget about any hassles with it.

Yep - as Bobkat says one at a time, paying attention only to each batteries terminals.

Charging both together depends on whether your system makes 24V by making the two 12V series into 24V "at the plug" or at the batteries (in that case you should see a big fat jumper from the + of one battery connected to the negative of the other, and only two wires, a positive and negative, going to the trolling motor)

older 12/24 boats (like mine which was wired in 2004) often fed the two 12V batteries' wires individually up to the plug, then the plug had a jumper that combined the two-12s into a 24. So there were 4 wires running to the trolling motor plug.

Bobkat's right, you'll get tired of the manual approach.

 

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you can buy cheap 24v chargers at napa for $85.  Then hook them up red connector on the positive of the one battery and the black connector on the negative of the other battery.  This will charge them at the same time. 

 

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murdock1978 Said:
I have six batteries in a series and my36v charger is not working how would I charge up these batteries??

six batteries in series would be 72 volts.

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I think he has six 6volt batteries in series = 36volts

jlh321 Said:

murdock1978 Said:
I have six batteries in a series and my36v charger is not working how would I charge up these batteries??

six batteries in series would be 72 volts.