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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

DC batteries in parallel??

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Exdynahoeman2

03-21-2005 19:05:21




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How does DC voltage work in both parallel and in series. I believe my John Deere 500C has 2 6 volt batteries and I wondered if they are in parallel or series to create 12 volts or if it"s a 6 volt system the way it"s wired.

My old Dynahoe had 2 12 volt batteries and I can"t remember if they were in series or parallel and which way it"s done to double the amperage (or I"m totally wrong). Can someone please educate me on this. Thank you!

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Loren

03-23-2005 18:34:42




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 Re: DC batteries in parallel?? in reply to Exdynahoeman2, 03-21-2005 19:05:21  
A simple explanation that might help you remember the how's. Each cell(section) in a battery is 2 volts. 'Course, 6 volt batts have 3 cells(caps to fill) and 12 volters have 6. If you add up more cells, more volts. Put the batts front to back and inline, + to - means you'll add more cells and hence volts. Put them side by side(+ straight across to +) and you get longer cranking to see if you can smoke the starter! LOL Oh, and when you put top post batteries in parallel you'll need a different configured cable setup since there won't be any posts open to connect to the tractors. One extra standard cable will work for series.

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Lavoy

03-22-2005 13:45:06




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 Re: DC batteries in parallel?? in reply to Exdynahoeman2, 03-21-2005 19:05:21  
Two batteries hooked in series doubles voltage, amps stays the same. Two batteries hooked in parallel doubles the amps, voltage stays the same.
Your tractor is not a 6 volt system.
Lavoy



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Phil H

03-22-2005 09:48:17




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 Re: DC batteries in parallel?? in reply to Exdynahoeman2, 03-21-2005 19:05:21  
Looks like you got a lot of good information, but just in case you don't know, a lead acid battery will produce 2volts per cell, so a 6volt battery has 3 cells. They are internally connected to give you 6v. at the + and - terminal. The same with a 12v battery, only it has 6cells. Hooking batteries + to - is a SERIES connection, and the current capacity of the smallest battery is what you get(and will get hot)so,keep same size batt. The voltage will be added, ie: 6+6=12 or12+12=24,or6+12=18v. PARALLEL,is + to +, - to - =volts of single batt. amps are added, 300a+500a=800a.etc.

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cadet trooper

03-26-2005 18:01:44




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 Re: DC batteries in parallel?? in reply to Phil H, 03-22-2005 09:48:17  
We got into this discussion a few weeks ago on another forum. One thing we all agreed on is if you have one bad cell in one of your batteries in a series it will drain the whole battery system down. We didn't discuss parallel properties for this. I guess the key thing is make sure both batteries are good before you do this. Also I've got a question for the gentleman that had the formula for amps in a parallel system. Will hooking more batteries in parallel require an alternator upgrade? Just curious.

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Phil H

03-27-2005 07:47:53




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 Re: DC batteries in parallel?? in reply to cadet trooper, 03-26-2005 18:01:44  
Hi, the more batteries hooked in parallel is a heavier load on the charging system. What ever current one battery requires will ADD, to the current required by another battery ie: 15A+10A=25A total current "load" on the charging system. If 2 batteries are connected in "series" the largest current draw from 1 batt. will flow through 2 batt. this will charge one batt. faster than the other, and could cause some cells to get warm. The charging voltage must be higher than the batt. volt the charging current can be regulated but is a function of the charging voltage. Some sofisticated chargers can limit the charging current while still keeping the charg volts high. these chargers are very expensive and not one you will probably ever need,unless you are charging forklifts, or big battery powered equipment. Needless to say this topic could go on forever, but I personaly like the drycell batt. (they don"t have sulfuric acid, but I believe they use a paste on lead foil, rolled into a cylinder shape)they are expensive, and I don"t know what the largest capacity is, but I have never seen one freeze and break, absolutely maint. free, and last a lot longer than a lead acid batt. Well sorry about all the chatter, hope it isn"t borring or wasting everyones time....

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Exdynahoeman2

03-22-2005 17:03:41




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 Re: DC batteries in parallel?? in reply to Phil H, 03-22-2005 09:48:17  
You guys are the best! I always get quick help here...

So it sounds like the Dynahoe must be + to + to maintain 12 volts but boost up the amps. And my JD must be 2 - 6 volt batteries wired + to - to run at 12 volts but same cranking amps right??

Truth be told..... John Deere block heater died so I wore down the batteries trying to start it. So I took the batteries out of the Dynahoe to help jump start it. Then it snowed like 10 times or 5 feet and I never got the dynasaur batteries back in. When I finally looked at it I started to second guess myself and last thing I wanted to do was screw this all up....

Would you believe me if I said I actually removed and rebuilt the whole Dyna head, blower, w pump etc etc myself but I wasn"t sure on this battery thing!! HA HA, better safe than sorry...

Thanks again

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jdemaris

03-21-2005 20:25:54




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 Re: DC batteries in parallel?? in reply to Exdynahoeman2, 03-21-2005 19:05:21  
Two batteries hooked in series doubles the voltage, two batteries hooked in parallel, the voltage stays the same.
I'm not sure what a 500C is, but the 500a and 500b were industrial versions of the 3020 farm tractor. Early diesel models had 12-12-24 volt systems custom designed for Deere by AC Delco. 24 cranking and charging, half the tractor 12 volts negative ground, and the other half 12 volts postive ground. It's easy to identify since the starter motor is non-grounded and has a 24 volt solenoid on it. The system would have two 12 volt batteries. The conventional 12 volt tractors originally came with two 6 volt batteries hooked in series - thus providing 12 volts. You can also put in two 12 volt batteries hooked in parallel - it works just as well. I assume your Dynahoe was Detroit Diesel powered with a 12 volt system, so if it had two 12 volt batteries, they were hooked in parallel.

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Bob/Ont

03-21-2005 19:25:33




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 Re: DC batteries in parallel?? in reply to Exdynahoeman2, 03-21-2005 19:05:21  
First off there is only DC batterys, can't store AC power. Inside your 6 volt battery is 3 cells hooked in series to give you 6 volts. If you need 12 volts then you hook two 6 volt batterys up in series. You need to find out from someone who knows Deere machinery what voltage and ground polarity your machine is before hooking it up. Hope this helps.
Later Bob



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