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Battery Charging Question
#2873543
08/08/19 07:20 PM
08/08/19 07:20 PM
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Joined: Oct 2003
Posts: 25,687
South Alabama
Rebelman
OP
Freak of Nature
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OP
Freak of Nature
Joined: Oct 2003
Posts: 25,687
South Alabama
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If you have a 24 volt trolling motor wired to two 12 volt batteries in sequence, and you connect the charging clamps to the positive and negative of a single battery, will you charge both batteries at the same time?
Last edited by Rebelman; 08/08/19 07:34 PM.
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Re: Battery Charging Question
[Re: Rebelman]
#2873547
08/08/19 07:23 PM
08/08/19 07:23 PM
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Joined: Oct 2008
Posts: 30,910
Clanton, AL
Out back
Grumpy Old Man
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Grumpy Old Man
Joined: Oct 2008
Posts: 30,910
Clanton, AL
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You can't get 48 volts from two 12 volt batteries.
What you probably have is two 24v batteries in series. And no it will not adequately charge both batteries. You need a two bank charger.
My opinions and comments are my own. They do not reflect the position or political opinions of Aldeer or any of the Aldeer administration.
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Re: Battery Charging Question
[Re: Out back]
#2873562
08/08/19 07:35 PM
08/08/19 07:35 PM
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Joined: Jan 2016
Posts: 4,753
Moody, AL
willdo22
10 point
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10 point
Joined: Jan 2016
Posts: 4,753
Moody, AL
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You can't get 48 volts from two 12 volt batteries.
What you probably have is two 24v batteries in series. And no it will not adequately charge both batteries. You need a two bank charger. He’s right
A mans got to know his limitations.
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Re: Battery Charging Question
[Re: Out back]
#2873586
08/08/19 07:57 PM
08/08/19 07:57 PM
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Joined: Aug 2014
Posts: 13,889
Mobile, AL
SouthBamaSlayer
Gary's Fluffer
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Gary's Fluffer
Joined: Aug 2014
Posts: 13,889
Mobile, AL
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You can't get 48 volts from two 12 volt batteries.
What you probably have is two 24v batteries in series. And no it will not adequately charge both batteries. You need a two bank charger. Huh? A 24v trolling motor runs off of 2-12v batteries. You do need a 2 bank charger.
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Re: Battery Charging Question
[Re: SouthBamaSlayer]
#2873599
08/08/19 08:05 PM
08/08/19 08:05 PM
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Joined: Oct 2008
Posts: 30,910
Clanton, AL
Out back
Grumpy Old Man
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Grumpy Old Man
Joined: Oct 2008
Posts: 30,910
Clanton, AL
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You can't get 48 volts from two 12 volt batteries.
What you probably have is two 24v batteries in series. And no it will not adequately charge both batteries. You need a two bank charger. Huh? A 24v trolling motor runs off of 2-12v batteries. You do need a 2 bank charger. He edited the post it first said 48v
My opinions and comments are my own. They do not reflect the position or political opinions of Aldeer or any of the Aldeer administration.
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Re: Battery Charging Question
[Re: Rebelman]
#2873700
08/08/19 09:15 PM
08/08/19 09:15 PM
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Joined: Feb 2003
Posts: 12,101
Sylacauga, AL
poorcountrypreacher
Booner
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Booner
Joined: Feb 2003
Posts: 12,101
Sylacauga, AL
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If you wire them parallel you can charge them both at the same time. I wouldn't wanna be constantly changing the cables, but you could get by with it short term.
All the labor of man is for his mouth, and yet the appetite is not filled.
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Re: Battery Charging Question
[Re: poorcountrypreacher]
#2873766
08/08/19 10:18 PM
08/08/19 10:18 PM
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Joined: Dec 2012
Posts: 9,643
Pisgah Al
Bigbamaboy
14 point
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14 point
Joined: Dec 2012
Posts: 9,643
Pisgah Al
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If you wire them parallel you can charge them both at the same time. I wouldn't wanna be constantly changing the cables, but you could get by with it short term.
Be careful doing this. You want batteries that are the same class and same age so one doesn’t reach full charge before the other. As long as they are the same, you are good to go.
Eli, Eli, lama sabachthani?
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Re: Battery Charging Question
[Re: Rebelman]
#2873779
08/08/19 10:36 PM
08/08/19 10:36 PM
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Joined: Apr 2015
Posts: 7,823
North Alabama
Hevishot13
14 point
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14 point
Joined: Apr 2015
Posts: 7,823
North Alabama
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If you have a 24 volt trolling motor wired to two 12 volt batteries in sequence, and you connect the charging clamps to the positive and negative of a single battery, will you charge both batteries at the same time? No, you’ll just charge the one. Two bank charger is what you need
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Re: Battery Charging Question
[Re: Bigbamaboy]
#2873781
08/08/19 10:36 PM
08/08/19 10:36 PM
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Joined: Apr 2015
Posts: 7,823
North Alabama
Hevishot13
14 point
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14 point
Joined: Apr 2015
Posts: 7,823
North Alabama
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If you wire them parallel you can charge them both at the same time. I wouldn't wanna be constantly changing the cables, but you could get by with it short term.
Be careful doing this. You want batteries that are the same class and same age so one doesn’t reach full charge before the other. As long as they are the same, you are good to go. This is correct
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Re: Battery Charging Question
[Re: Bigbamaboy]
#2873905
08/09/19 08:02 AM
08/09/19 08:02 AM
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Joined: Feb 2003
Posts: 12,101
Sylacauga, AL
poorcountrypreacher
Booner
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Booner
Joined: Feb 2003
Posts: 12,101
Sylacauga, AL
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If you wire them parallel you can charge them both at the same time. I wouldn't wanna be constantly changing the cables, but you could get by with it short term.
Be careful doing this. You want batteries that are the same class and same age so one doesn’t reach full charge before the other. As long as they are the same, you are good to go. I will admit to not totally understanding how a charge controller works with multiple batteries hooked in. In a situation like above, if you hook them up parallel and then hook the charger to the posts of one battery, I assume if it's an automatic charger it is going to cut off when the battery it is connected to is charged. The charger will charge the second battery for as long as it's working, but the second one might not be fully charged when it cuts off. I guess this is what you are warning about? I have a solar system at the cabin with 6 of the 6 volt golf cart batteries wired in series so that each pair produces 12 volts, and then the 3 pair are wired parallel so that the whole system produces 12 volts. But then I have 3 different 12 volt marine batteries added on to the end of the string. I leave these hooked in until I need a 12 volt battery around the farm, and will pull one out and use it, then hook it back in to charge. I thought this would be really hard on the 12 volt batteries, but 2 of them are now 7 years old and they still hold a full.charge. There is a charge controller that controls the system that is rated to control 7 batteries, and I essentially have 6. I frequently find it has quit charging in the summer because the batteries are fully charged. I don't understand how it is able to measure the charge of multiple batteries? Can anyone explain that? Or is it just measuring the voltage of the bank and shutting down based on that? And if that's the case, why is there a 7 battery limit? It looks like the number of batteries would be irrelevant if that's the way it works. Someone please explain it to me. All I know is that the system has worked for 12 years.
All the labor of man is for his mouth, and yet the appetite is not filled.
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