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Wiring two battires to get 24 volts from them

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Robert E. Smith

03-12-2005 20:04:12

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A little off topic but was wondering if someone could tell me how to wire two 12 volt batteries together to get 24 volts out of them?
I think you hook the positive of one to the negitive of the other and then you hook the positive and negitive up to your motor from the other positive and negitive just like you would if you were hooking up a single 12 volt battery, Is this right?
And my next question is can you charge both batteries together with a single 12 volt charger or would you need to unhook them and chage each battery seperate?
Thanks for any help on this.
Bob Smith

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Joe Losinski

03-13-2005 09:41:50

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Re: Wiring two battires to get 24 volts from them in reply to Robert E. Smith, 03-12-2005 20:04:12

An applied voltage higher than the emf of one cell can be obtained by connectiong cells in series, the total voltage available across the battery of cells is equal to the sum of the individual values of each cell, Parallel cells have the same voltage as one cell but have MORE CURRENT capacity, so your current will be less in series then in parallel, always remember, more voltage, less current. there you have it....

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Chris Vangel

03-12-2005 20:25:50

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Re: Wiring two battires to get 24 volts from them in reply to Robert E. Smith, 03-12-2005 20:04:12

Your hook up is correct. You are connecting the batteries in series. Positive to negative, leaving you a positive and negative to hook up to your equipment.

As for charging, in order to charge the batteries using a 12 volt charger you would need to separate the batteries and charge them independantly. In order to charge them together, you need a 24 volt charger.

I have to ask, what are you trying to put 24 volts to? That's alot of juice. Chris.

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Robert E. Smith

03-13-2005 17:16:34

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Re: Wiring two battires to get 24 volts from them in reply to Chris Vangel, 03-12-2005 20:25:50

Hey guy's
Thanks for all the help! I searched the web last night for something on it and could not find anything! Then I remembered all you smart fellers on here! I knew I could get the answers I needed here Thanks again!
And Chris to answer your question I'm hooking up a new 24 volt Trolling motor on my Bass Boat, got a 4 day stripper fishing trip coming up Easter weenkend at lake Cummberland in Kentucky! Of course if the weather dont improve soon I my need to take a ice auger along! Between 7 of us we caught 56 fish last year in 4 days! Of course we didn't keep them all mostly catch and release but did keep our limit per day (2 per person per day), I think the smallest was 11 pounds and the largest was 28 pounds.
if you have never fished for stripper you got to try it ! You talk about a fighting fish! there a blast!
Thanks again to everyone who posted this is like the best place to get a answer when you cant find it!
Bob

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thurlow

03-13-2005 05:10:00

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Re: Wiring two battires to get 24 volts from them in reply to Chris Vangel, 03-12-2005 20:25:50

As kenny correctly stated, you do not have to separate the batteries in order to charge them with a 12V charger..... ..

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Chris Vangel

03-13-2005 10:16:36

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Re: Wiring two battires to get 24 volts from them in reply to thurlow, 03-13-2005 05:10:00

You guys are absolutely correct. I wasn't thinking. I've charged the batteries in a powerstoke Ford many times. Simply hook the charger up to the terminals of the SAME battery, when it's done charging, move the charger to the terminals of the other battery.

If you have two chargers, you could hook one charger to each battery at the same time. We did that at the Chrysler dealer to charge a 1 ton deisel that had the lights were left on.

You would only need a 24 volt charger if you were attempting to charge both batteries at the same time with one charger.

Thanks for setting me straight Coloken, It's been a while since I've had to do, guess I had cobwebs in my head.

Chris

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rotten robert

03-13-2005 18:59:34

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Re: Wiring two battires to get 24 volts from them in reply to Chris Vangel, 03-13-2005 10:16:36

The batteries in a Powerjoke are hooked up parrallel and only deliver 12V to the starter.

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HarryG

03-13-2005 05:25:21

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Re: Wiring two battires to get 24 volts from them in reply to thurlow, 03-13-2005 05:10:00

You MUST separate the batteries in order to charge.

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buickanddeere

03-13-2005 10:26:22

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Re: Wiring two battires to get 24 volts from them in reply to HarryG, 03-13-2005 05:25:21

In series individual batteries can be charged. In parrallel one dud battery that is shorted will prevent charging the good one. If the dud battery is open. Charging of the good battery is unaffected. Two unbalanced/different charge/different size/ different age batteries in series or parallel will at best reduce system performance, can discharge the good battery or blow the bad cell when under load.

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cadet trooper

03-13-2005 10:00:07

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Re: Wiring two battires to get 24 volts from them in reply to HarryG, 03-13-2005 05:25:21

I"ve got a question for you knowledgeable folks. What happens when one of those batteries hooked in a series has a bad cell? I"ve got that condition going on right now with a sissors lift that has 4-6volt batteries hooked in a series. Grouped together they won"t hold a charge.

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buickanddeere

03-13-2005 10:30:46

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Re: Wiring two batteries to get 24 volts from them in reply to cadet trooper, 03-13-2005 10:00:07

That bad cell can reverse polarity, generate excessive hydrogen & oxygen. Spark internally and explode. Time for a complete set of new batteries. If the charger isn't intelligent and will trickle charge then float.Toss it too because it will ruin the next batch of batteries as well. Flooded cell batteries are old junk from the past. AGM battereis from Optima or Odyssey are the only way to go. Better yet if the application allows is the New BattCaps. No lead, non toxic and can be tossed into a landfill.

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cadet trooper

03-13-2005 16:26:20

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Re: Wiring two batteries to get 24 volts from them in reply to buickanddeere, 03-13-2005 10:30:46

Thanks b&d I"m having a hard time getting my guys to understand this condition. They"re really very good AC power guys but DC power kind of throws them. I"m getting new batteries tomorrow.I wasn"t aware of the new battery technology that you mentioned but I will look into it, Thanks again!

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buickanddeere

03-13-2005 18:27:00

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Re: Wiring two batteries to get 24 volts from them in reply to cadet trooper , 03-13-2005 16:26:20

Link

What ever you do, make certain that charger isn't ruining the batteries with too high voltage and current when they are charged.

Link

No matter who makes the battery or how. A lead acid battery's life is shortened by over charging, high temperatures, deep cycling or being left sitting discharged.

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T_Bone

03-14-2005 01:21:22

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Re: Wiring two batteries to get 24 volts from them in reply to buickanddeere, 03-13-2005 18:27:00

I got to agree with B&D as those Optima battery's are a great battery. Hard to ruin one.

Here in Arizona, (because of the high summer heat) if we get 3yrs from a lead acid starting battery, were lucky and thats buying the good ones.

My son bought a F100 with a 5yr old Opitma redtop. He drove the truck for 2yrs then let it sit at my place where the battery would go dead. I would jump start the battery every 4mths or so and drive the truck for a hour or so then park it where it once again sat discharged. This was for about a year then he sold the truck and the new owner wrecked the truck one year latter. So that's 9yrs on the Optima red top and the battery was still good.

For my PSD starting battery's, when it's time, then I will use the Opitma yellow tops.

On my golf cart or my RV, however it's not cost effective to use the Optima yellow top battery's. They cost about 100% more and have 29% less useable amp/hrs than the 6v Trojan T-105 lead acid battery's.

Other brands of AGM's have comparable amp/hrs but at three times the cost. I don't think it will be too long before the AGM's drop in price or the lead acid's are forced out of existance.

T_Bone

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thurlow

03-13-2005 06:32:55

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Re: Wiring two battires to get 24 volts from them in reply to HarryG, 03-13-2005 05:25:21

Been doing it 40 years on 24V tractors..... .with 2 (12V) batteries in series. Hook (12V) charger to each battery..... .one at a time; doesn't matter that the batteries are still connected. See T_Bone's post..... ...

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T_Bone

03-13-2005 05:44:15

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Re: Wiring two battires to get 24 volts from them in reply to HarryG, 03-13-2005 05:25:21

Hi Harry,

On my 36v golf cart I can charge two battery's with a 12v charger without disconnecting cables. I have to move the charger 3 times total to get a complete charge. This is the slowest charge configuration. About 48hrs recharge time.

If I seperate the 6 battery's in groups of two for 12v, then I get a faster recharge time than not seperating them. Again moving the charger 3 times. About 10hrs recharge time per-set.

I series three 12v chargers so I can charge all battery's at the same time. This gives me 40vdc@6amps. 6amps is my smallest charger. This method recharges all six battery's in about 8-10hrs.

You could also series two 12v chargers for a 24v system.

T_Bone

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HarryG

03-13-2005 07:33:14

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Re: Wiring two battires to get 24 volts from them in reply to T_Bone, 03-13-2005 05:44:15

T-Bone,
I see what you're saying. Can be done but "individually" charge each battery without disconnecting cables, using one charger only. To series charge then would have to use multiple chargers, ie; 24 volts system=2, 12 volt chargers in series.

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03-12-2005 22:01:41

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Re: Wiring two battires to get 24 volts from them in reply to Chris Vangel, 03-12-2005 20:25:50

24 volts use? Possibly JD diesel? Or X-military Jeep or weapons carrier? Or Diesel truck? Lots of possibilities. RN

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Coloken

03-12-2005 20:16:33

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Re: Wiring two battires to get 24 volts from them in reply to Robert E. Smith, 03-12-2005 20:04:12

Yes you have it right. You must charge each seperatly if you have a 12 volt charger. You don't have to unhook if you hook the charger direct to/across each battery, one at a time.

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