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Tractor Talk Discussion Forum

Charging 24 volt system with 12 volt charger

Author 
Moline_guy

12-12-2006 16:46:10
66.231.24.123



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We have a 24 volt case payloader and i was wondering if it is possible to charge the batterys with a 12 volt charger and not cause any damage to the alternator with the battery calbles hooked up? We charge it occosionally now but we always disconnect the batterys and charge them separately. It is charging but batterys are on the weak side and on cold mornings just works better to charge them a little to make everything spin faster. Thanks for any replies.

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Moline_guy

12-13-2006 09:43:00
66.231.24.171



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 Re: Charging 24 volt system with 12 volt charger in reply to Moline_guy, 12-12-2006 16:46:10  
Thanks for all your replies, we have throw swithches on the batteries and a couple of battery chargers. We have been throwing the swithces and charge the batteries separately at the same rate for ten minutes or so on real cold mornings just to warm up batteries. Putting the chargers in series seems to make sense and not boosting with a 12v vehicle was something else i was wondering about,so thanks for the tips. It is the only piece of equipment we farm with that has 24v so an expensive charger that gets used a few days a year really is not justifiable, thanks again for all replies.

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Bob

12-13-2006 10:25:13
69.178.229.154



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 Re: Charging 24 volt system with 12 volt charger in reply to Moline_guy, 12-13-2006 09:43:00  
DO NOT put the chargers "in series", as such.

Properly connect one to each battery, matching the charger's polarity to that of the battery posts. THEN turn on the chargers.



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T_Bone

12-13-2006 14:59:59
4.240.42.2



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 Re: Charging 24 volt system with 12 volt charger in reply to Bob, 12-13-2006 10:25:13  
And your problem with series chargers is ???

T_Bone



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Bob

12-13-2006 16:18:55
69.178.229.154



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 Re: Charging 24 volt system with 12 volt charger in reply to T_Bone, 12-13-2006 14:59:59  
MANY chargers nowdays are electronically-controlled.

My point was not to connect the actual chargers in series to get 24-Volts (in other words, not connecting the middle (+) and (-) charger leads together, without attaching the midpoint to the midpoint of the series-connected batteries.

If you read my other post I DO use two float chargers at the same time on a 24-Volt Deere 4020, but DO have the chargers connected to the midpoint of the series-connected batteries.

I don't think leaving the midpoint of the electronic chargers "float" would work very very well, and also someone might try to use two chargers of different capacity.

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T_Bone

12-13-2006 20:29:10
4.240.132.32



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 Re: Charging 24 volt system with 12 volt charger in reply to Bob, 12-13-2006 16:18:55  
Hi Bob,

Your right as my mind was thinking the transformer based chargers and elimanated any consideration on the eletronic regulation using the newer charging alogrythms.

I would hate to see someone ruin a charger from of my series circuit suggestion. I have used one newer trickle chargers using a modified PWM regulator in my circuits without problems but there again it could have been just dumb luck as I didn't look into of how the regulator works.

T_Bone

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T_Bone

12-13-2006 06:44:01
4.240.42.79



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 Re: Charging 24 volt system with 12 volt charger in reply to Moline_guy, 12-12-2006 16:46:10  
Hi MGuy,

Just use two 12v chargers in series. negitive charger#1 to negitive battery#1, positive charger#1 to negitive charger#2, positive charger#2 to positive battery#2 equals 24vdc charge.

I use this same circuit to charge my 36v golf cart with 3, 12v chargers, two unregulated and one regulated, but the regulator won't work in a series circuit. Takes about 10hrs to recharge my 6v battery's from dead to fully charged. That's using a 6a, 10a and 20a chargers. I put the 6a charger in the center conection but it really wouldn't matter where in the circuit it's located.

T_Bone

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John T

12-12-2006 17:22:38
66.244.90.5



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 Re: Charging 24 volt system with 12 volt charger in reply to Moline_guy, 12-12-2006 16:46:10  
Guy, Sure you can charge just one of the 12 volt batteries at a time but I would advise you set the charger at the same rate n apply it the same time to each batery so they get half way at least equal charges. JUST MAKE SURE you apply the charger polarity correct, + to + and - to -.

On any dual battery system its best if both are the same size n type n model n age n condition and state of charge n specific gravity etc etc cuz if one is weak it can suck down the good one.

John T

John T

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pafreehling

12-12-2006 17:11:09
167.239.220.188



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 Re: Charging 24 volt system with 12 volt charger in reply to Moline_guy, 12-12-2006 16:46:10  
We have a Case 850B dozer 24volt. Yeah, you can charge one at a time even without unhooking the cables but DO NOT try jumping this loader with battery cables. You will ruin the batteries and/or alternator on the running unit even if you hook it only to the one battery. I found this out the easy way, someone had it happen to them before I needed to jump start mine.



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the tractor vet

12-12-2006 17:05:57
76.212.225.86



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 Re: Charging 24 volt system with 12 volt charger in reply to Moline_guy, 12-12-2006 16:46:10  
the only way to do this is one battery at a time and ya have to unhook them . When one has heavy equipment one should have a 6-12-24 volt charger as it is a real pain when ya need to charge one of them up .



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Bob

12-12-2006 17:20:41
69.178.229.154



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 Re: Charging 24 volt system with 12 volt charger in reply to the tractor vet, 12-12-2006 17:05:57  
There's ABSOLUTELY no need to unhook the batteries.

HOWEVER, when working with this or ANY battery setup, wear the appropriate safety goggles!

Simply charge one 12-Volt battery at a time with the 12-Volt charger, or you can use two 12-Volt chargers at a time, one connected to each battery.

At each battery, put the charger's RED clip on the battery's (+) terminal and the BLACK clip on the (-) terminal, following the markings on the battery case.

I have done this with semi trucks, Deere 730's and an 830, and with a 24-Volt 4020 I still own.

Absolutely no problems.

To be extra safe, set the battery charger(s) on the ground, or an a table or stand away from the frame of the machine. (SOME older battery chargers had the (-) lead internally connected to the metal case of the charger, and the case of the charger COULD spark to the frame of the machine when connected to one of the batteries.)

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the tractor vet

12-12-2006 17:51:50
76.212.225.86



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 Re: Charging 24 volt system with 12 volt charger in reply to Bob, 12-12-2006 17:20:41  
Well maybe so but i unhook them and do one at a time with two chargers , i am to cheap to buy a good charger



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buickanddeere

12-12-2006 19:41:05
216.183.151.146



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 Re: Charging 24 volt system with 12 volt charger in reply to the tractor vet, 12-12-2006 17:51:50  
You can't affford a charger but........... You can internally stress the posts/plates each time the cables are removed & tightened, wear on the posts and clamps, the risk of a short circuit when wrenching live batteries and the risk of a face full of acid from an exploding battery? Battery chargers are dirt cheap. The only way to blow a battery as described when boosting is if you had the boosting vehicle touching the boosed machine. Or you had the polarities mixed up.

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the tractor vet

12-12-2006 20:14:28
76.212.225.86



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 Re: Charging 24 volt system with 12 volt charger in reply to buickanddeere, 12-12-2006 19:41:05  
I normaly do not work on construction equipment but there have been a few times that we have so why would i want to sped three hundred bucks for a 24 volt battery charger . And i can count the times that i have on one hand . And the last truck that i drove with a 24 volt system was a B 61 mack . Now today all big trucks are stright 12 volt even though they have 3-4 batterys and all Farmalls are either 6 or 12 so here again my two 89.95 6-12 battery chargers are fine.

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buickanddeere

12-13-2006 09:34:35
216.183.151.146



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 Re: Charging 24 volt system with 12 volt charger in reply to the tractor vet, 12-12-2006 20:14:28  
That's what I ment, two econo 12V chargers are fine together on a 24V system.In some ways a better charge too.



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Jon Hagen

12-13-2006 12:59:34
69.26.29.114



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 Re: Charging 24 volt system with 12 volt charger in reply to buickanddeere, 12-13-2006 09:34:35  
If your handy with electronics and have a spare 6-12V charger,you can convert it to a 12-24V by adding a full wave rectifier to replace the stock 1/2 wave setup. The half wave setup draws voltage from the secondary winding center tap and either end of the transformer to give 6 or 12V. Connecting a full wave rectifier across only the secondary windings without using the center tap will give 2X the voltage at 12 or 24V.

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