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Old 03-01-2011, 10:46 AM   #1
grits
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Default Connecting Two Batteries together

This is a question for you electical gurus, I dont have a lot of room in the trunk of my coupe for the battery and a friend suggested I use two 6 volt batteries, one on either side of the trunk and tie them together to make a 12 volt system, seems like it would still be 6 volts, am I an idiot or what?

So help me I'm just not sure.
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Old 03-01-2011, 10:47 AM   #2
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Default Re: Connecting Two Batteries together

2 - 6 volt batteries is still 6 volt. HRP
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Old 03-01-2011, 10:49 AM   #3
maniac
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Default Re: Connecting Two Batteries together

If you wire them in series, all you will have is 6 volts.

If you can't fit a 12 volt battery how you gonna fit 2 6's, last time I looked they were around the same size.
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Old 03-01-2011, 10:49 AM   #4
seventhirteen
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Default Re: Connecting Two Batteries together

still 6 volts and why would you do that anyways?
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Old 03-01-2011, 10:50 AM   #5
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Default Re: Connecting Two Batteries together

Wire them in series ' + term to - of the other . The two remaining terminals will be 12V
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Old 03-01-2011, 10:50 AM   #6
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Default Re: Connecting Two Batteries together

In series, the voltage is cumulative. In parallel its current is cumulative.
Add 'em up!
Measure w/your VOM/multimeter and it will be obvious. If you wanted to have 24 volts, buy two more batts.
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Old 03-01-2011, 10:51 AM   #7
grits
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Default Re: Connecting Two Batteries together

Thanks HRP, I have thought this over several times and have argued that point with him.
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Old 03-01-2011, 10:55 AM   #8
Dreddybear
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Default Re: Connecting Two Batteries together

I disagree..

Wire in series will produce 12 volts.

Wired Parallel will produce 6 volts with more capacity.

Ground to - battery A.

+ Battery A to - Battery B

+ Battery B 12 Volts
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Old 03-01-2011, 10:55 AM   #9
seventhirteen
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Default Re: Connecting Two Batteries together

i stand corrected, learn something new everyday, read this, your friend is correct

Quote:
There are two basic ways to wire multiple batteries together, in "Parallel" or in "Series".

PARALLEL
Wiring two batteries which have the same output voltage in "Parallel", the output voltage of the combination stays the same but the amp/hour capacity of the combination is equal to the sum of their individual amp/hour capacities.

Wiring: Battery 1 Positive to Battery 2 Positive and Battery 1 Negative to Battery 2 Negative is Parallel wiring, retaining the voltage rating of either one of the batteries.

WARNING
It is not a good idea to wire two batteries which have different voltage ratings in parallel because the one with the higher voltage will immediately send current to the other one with the lower voltage to try to make their voltages both the same. The very high current which will flow between the two batteries is likely to make the batteries get very hot. IF THEY ARE CAR BATTERIES THEY COULD EXPLODE!


SERIES
Wiring two batteries which have the same output voltage in "Series" makes their combined output voltage equal to the sum of their individual voltages but the amp/hour capacity of the combination will be no greater than the amp/hour capacity of the smallest battery of the two.

Wiring: Bat 1 Positive to Load, and Bat 1 Negative to Bat 2 Positive, then Bat 2 Negative to the other side of the Load is Series wiring and the total voltage of the combined batteries is the sum of both individual voltage ratings.

So, assuming you want to get 24 volts out of two similar batteries, you could wire two 12 volt batteries in series.

NEVER OPERATE A 12 VOLT ELECTRICAL SYSTEM as in CARS or most BOATS with 24 VOLTS. YOU WILL BURN UP YOUR COMPONENTS AND SOME WIRING.

<><><>

Common Flashlights are simple examples of series wiring. Flashlight batteries are usually 1.5 volts whether they are AAA, AA, C or D size. So flashlights with with 1 battery are operating at 1.5 volts, 2 batteries are 3 volts, 3 batteries are 4.5 volts, etc.



Read more: http://wiki.answers.com/Q/How_do_you...#ixzz1FMrelK6W
course i still wonder why you would want to do this...
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Old 03-01-2011, 10:56 AM   #10
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Default Re: Connecting Two Batteries together

Quote:
Originally Posted by grits View Post
This is a question for you electical gurus, I dont have a lot of room in the trunk of my coupe for the battery and a friend suggested I use two 6 volt batteries, one on either side of the trunk and tie them together to make a 12 volt system, seems like it would still be 6 volts, am I an idiot or what?

So help me I'm just not sure.
They make very small batteries for the street rod crowd. Get one of those. More often than not a 6V is the same size or bigger than a 12V battery anyway.
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Old 03-01-2011, 10:56 AM   #11
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Default Re: Connecting Two Batteries together

Quote:
Originally Posted by Dreddybear View Post
I disagree..

Wire in series will produce 12 volts.
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Old 03-01-2011, 10:56 AM   #12
Timbo from Mempho
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Default Re: Connecting Two Batteries together

Optima 6 V batteries are really small, bout like 3 tall boys standing side by side. When hooked in series (Positive from batt 1 to Negative on batt 2) you will get 12 volts. When hooked parrallel (Pos to Pos and Neg to Neg) you would only get 6 volts.
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Old 03-01-2011, 10:56 AM   #13
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Default Re: Connecting Two Batteries together

Quote:
Originally Posted by pitman View Post
In series, the voltage is cumulative. In parallel its current is cumulative.
Add 'em up!
Measure w/your VOM/multimeter and it will be obvious. If you wanted to have 24 volts, buy two more batts.
Correct he is. A lot of Cat loaders use six volt batteries wired in series to get higher voltage. Among other rigs. Wired parallel would just create a bigger 6 volt though.
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Old 03-01-2011, 10:58 AM   #14
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Default Re: Connecting Two Batteries together

I think it would be 12v as that is the way golf carts are wired to make 36 or 48v

Some info here

http://wiki.answers.com/Q/How_do_you...equal_12_volts
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Old 03-01-2011, 10:59 AM   #15
grits
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Default Re: Connecting Two Batteries together

Quote:
Originally Posted by flacoman View Post
Wire them in series ' + term to - of the other . The two remaining terminals will be 12V
That is what he is telling me.

Quote:
Originally Posted by pitman View Post
In series, the voltage is cumulative. In parallel its current is cumulative.
Add 'em up!
Measure w/your VOM/multimeter and it will be obvious. If you wanted to have 24 volts, buy two more batts.
I dont want or need 24 volts, the question is can I use two smaller 6 volt batteries wired in a fashion to get the 12 volts needed.

I thought of one smaller on each side of the trunk kinda tucked behind the quarter panels,
that would give me a little more room.
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Old 03-01-2011, 10:59 AM   #16
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Default Re: Connecting Two Batteries together

Quote:
Originally Posted by pitman View Post
Hold your cards...we may have a winner!
I meant I disagree with the other couple guys
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Old 03-01-2011, 11:02 AM   #17
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Default Re: Connecting Two Batteries together

If you join the positive terminal of one battery to the negative terminal of the second battery the two remaining terminals will give you a 12 volt system. Thats not a silly idea if room is your problem.
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Old 03-01-2011, 11:03 AM   #18
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Default Re: Connecting Two Batteries together

Quote:
A lot of Cat loaders use six volt batteries wired in series to get higher voltage.

Mostly to get higher amperage, My KW has 4-12 volt batts, 12 volt starter, originally came with 3, I aded one for the amps here for the cold weather.
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Old 03-01-2011, 11:05 AM   #19
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Default Re: Connecting Two Batteries together

It should work just fine - Remember for 12V from 2 x 6V to connect the '+' terminal from battery 1 to the '-' terminal from battery 2 with the largest gauge wire you can locate. I would suggest 0 (zero) or 0/0 gauge wire with soldered terminals.

The '-' terminal from Battery 1 will be '-' ground and the '+' terminal from battery two will be your normal '+' battery terminal.

It will be tough to jump start if needed, but it should work fine.

Last edited by belyea_david; 03-01-2011 at 11:08 AM. Reason: typo
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Old 03-01-2011, 11:06 AM   #20
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Default Re: Connecting Two Batteries together

I say do it, and take a picture. sounds very practical
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Old 03-01-2011, 11:09 AM   #21
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Default Re: Connecting Two Batteries together

Quote:
Originally Posted by 35desoto View Post
If you join the positive terminal of one battery to the negative terminal of the second battery the two remaining terminals will give you a 12 volt system. Thats not a silly idea if room is your problem.

BINGO!

Thanks for all the quick replies, you guys are great.
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Old 03-01-2011, 11:12 AM   #22
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Default Re: Connecting Two Batteries together

It all sounds like re-inventing the wheel to me. Extra wire, extra battery, 2 mounts, double the related electrical hardware, vs finding a heavy duty small battery. I won't bother to repeat how to get 12 from 6...
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Old 03-01-2011, 11:12 AM   #23
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Default Re: Connecting Two Batteries together

makes sense now, like i said learn something new everyday
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Old 03-01-2011, 11:18 AM   #24
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Default Re: Connecting Two Batteries together

Have a look at Odessey batteries....they are a dry cell. I put one in my smallblock powered A with a high torque starter. A p680 I believe, works great!
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Old 03-01-2011, 11:19 AM   #25
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Default Re: Connecting Two Batteries together

Let me throw this out there.......

When I worked in the RV industry, most RVs had room for two 6-volt batteries next to each other for the coach side (Not the engine starter). It's a known fact that two 6-volt batteries at 800cca each in series will outperform two 12-volt batteries at 800cca each in parallel.
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Old 03-01-2011, 11:33 AM   #26
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Default Re: Connecting Two Batteries together

yeah 2 6v in series will give you 12v with no bump in amp supply.. now.. unless you run an optima most of those series 1 batts will only supply 450cca.. that isnt much.. what are ya cranking over? also you might want to think about an optima or some other sealed battery, the reason for this is you can mount em in any posistion you like.. might be able to mount it sideways somewhere and make a 12v battery fit.. all this reminds me of my friends time on the R+D team at vector, there wasn't enough room for an adequate size battery at the time to crank that high compression v8. so Jerry's thought was to get one of those batteries at the time that had a lever on top you could flip for a little extra amps, and one of my friends jobs was to make a cable pull system so you could do this from the dash. ahh vectors.. but thats a story for a different board...
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Old 03-01-2011, 11:48 AM   #27
Dale Fairfax
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Default Re: Connecting Two Batteries together

Have you priced a 6 volt battery lately? It's a damned expensive way to get 12 volts. And I'm sure you can find a 12 v. battery that's near the same size as a 6 v.
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Old 03-01-2011, 11:57 AM   #28
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Default Re: Connecting Two Batteries together

I helped a guy do a 12 volt conversion, he used a 6 volt under the hood so it looked stock and another 6 volt in the trunk, wired in series to get the 12 volts.

if you really want to confuse yourself you can wire them in series/parrallel and get 12 volts and twice the amperage.
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Old 03-01-2011, 12:02 PM   #29
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Default Re: Connecting Two Batteries together

Yes you can wire two 6 volt batterys and make 12 volts, but you need to run large cable from one battery to the other and up to the starter, and that starts to get pricey, minuim 2 ought cable for batt to batt and should do the same up to the starter.
Group 31 12 volt batterys get you about 850 to 900 cranking amps they cost about $113.00 the large 6 volts run 900 to 1000 amps but they run about 100.00 also.
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Old 03-01-2011, 12:02 PM   #30
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Default Re: Connecting Two Batteries together

Quote:
Originally Posted by 1950coronet600hp View Post
yeah 2 6v in series will give you 12v with no bump in amp supply.. now.. unless you run an optima most of those series 1 batts will only supply 450cca.. that isnt much.. what are ya cranking over? also you might want to think about an optima or some other sealed battery, the reason for this is you can mount em in any posistion you like.. might be able to mount it sideways somewhere and make a 12v battery fit.. all this reminds me of my friends time on the R+D team at vector, there wasn't enough room for an adequate size battery at the time to crank that high compression v8. so Jerry's thought was to get one of those batteries at the time that had a lever on top you could flip for a little extra amps, and one of my friends jobs was to make a cable pull system so you could do this from the dash. ahh vectors.. but thats a story for a different board...
Agree - 2 x 6 = 12. But 2 6 Volt batteries is NOT equal to one 12 volt battery. The cranking amps is not the same.
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Old 03-01-2011, 12:04 PM   #31
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Default Re: Connecting Two Batteries together

The 1970 MGB I recently acquired has two small wells just behind the seats for two six volt batteries and a 12 volt system. I suppose back then 12 volt batteries couldn't be that small. It now has a single 12 volt that fits in a single well. It is 7 years old I am told, and still cranks it over just fine.
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Old 03-01-2011, 12:06 PM   #32
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Default Re: Connecting Two Batteries together

I realize the cost envolved with the 2 batteries, it was just thinking in and out of the box to use the space I have the best way possible, honestly, the only thing that I would ever use the trunk for is just a small tool pack or something like that, but thanks for all the input, I really appreciate it.

That's what to me is the best about this place, ask a question and within minutes you have all the answers you need.
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Old 03-01-2011, 12:06 PM   #33
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Default Re: Connecting Two Batteries together

Beats me.
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Old 03-01-2011, 12:11 PM   #34
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Default Re: Connecting Two Batteries together

Oh let add to the bull.Back in the day when 12 volts was un heard of,when a 6 volt car didn,t turn over fast enought you could take 2 6s in series get it going that way.The way batterys are made they are joined together + -+- , so +-+- is 12 volts
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Old 03-01-2011, 12:12 PM   #35
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Default Re: Connecting Two Batteries together

MG used (2) 6-volt batteries in the MGB up to, I think, 1974. Car was still 12V negative ground.

Pete
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Old 03-01-2011, 12:14 PM   #36
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Default Re: Connecting Two Batteries together

This is very common in motor homes. You have to make sure the batteries are the same size, quality, age, rating, and charge otherwise one will drain into the other one and eventually they will just both go dead.
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Old 03-01-2011, 12:21 PM   #37
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Default Re: Connecting Two Batteries together

Did it a boat. Worked great. We sure get a lot of folks answering questions
on here that don't know the answers
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Old 03-01-2011, 12:35 PM   #38
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Default Re: Connecting Two Batteries together

If you put batteries in a long flashlight,
they all go in + to -,
and only use the first and last +/- contacts
which basically adds up all the voltage.

Old Morgans used 2 6-volt batteries to make up 12 volts.

TP
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Old 03-01-2011, 12:37 PM   #39
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Default Re: Connecting Two Batteries together

Oh yeah,
I'm running a 6volt system,
and just have an extra battery in case the generator dies.
However,
I can double them up to 12v in the future.


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Old 03-01-2011, 12:40 PM   #40
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Default Re: Connecting Two Batteries together

Quote:
Originally Posted by maniac View Post
If you wire them in series, all you will have is 6 volts.

If you can't fit a 12 volt battery how you gonna fit 2 6's, last time I looked they were around the same size.
Sorry dude, but 2x 6 volts in series =12v

If they were connected in parallel, then you would have 6v.
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Old 03-01-2011, 12:41 PM   #41
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Default Re: Connecting Two Batteries together

A saying I learned from a crusty Senior Chief electrician when I first got out of EM school in the CG. Save Pay = Series adds voltage and Parallel adds amps I am actually going to go with the same set up of two 6volt optima's under the bed of my project in series.
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Old 03-01-2011, 12:47 PM   #42
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Default Re: Connecting Two Batteries together

MGA's from the late 50's came that way from the factory (space reasons behind the seat). Two 6 volts wired in series = 12 volts.
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Old 03-01-2011, 01:00 PM   #43
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Default Re: Connecting Two Batteries together

Here's George Poteets 32 Delivery with 2-6v batteries!

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Old 03-01-2011, 01:13 PM   #44
Dale Fairfax
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Default Re: Connecting Two Batteries together

One thing not touched on here(maybe irrelevant) is the old "Orpin" switch sold by J.C Whitney, It was a system that (when wired correctly) connected two 6 volt batteries in series for cranking (switch was energized by starter button) but reverted to parallel as soon as you released the starter button. Crank with 12-run on 6. Had one in my F-100 for years.
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Old 03-01-2011, 08:14 PM   #45
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Default Re: Connecting Two Batteries together

Did this back in the 50s, my budy had a 40 Ford with a hemi that started hard. Hooked two 6 volt battrys in series to starter, one 6 V. to the lights the the other one for ign., a wire from the gen. to each of them to keep the charge up.
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Old 03-01-2011, 08:50 PM   #46
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Default Re: Connecting Two Batteries together

I've ran those in 6 of my 32 roadster's that I've built . Put them on there side in the trunk area between the outside metal and the lid above the tank then covererd with a panel . to hide them . Used the Gel Batterys red top ones !
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Old 01-17-2012, 03:48 PM   #47
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Default Re: Connecting Two Batteries together

Using 2 6v batteries was the way GM built some early 50's 12 volt Cadillacs...They had a long, narrow 6 volt battery in each front fenderwell, just ahead of the firewall. Yes, a real PIA to get to ! Two of our customers had them.

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Old 01-17-2012, 04:05 PM   #48
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Default Re: Connecting Two Batteries together

You know those caps on the top of batterys where we used to put water in? Well each of those caps represents a battery that puts out about 2.2 volts and they're all internally connected (in series) inside the case.

Three caps = 6 volt battery
Four caps = 8 volt battery
Six caps = 12 volt battery
and so on.

You can add batteries in series to add up the voltages, or you can add them in parallel to add up the current (amps).
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Old 01-17-2012, 04:10 PM   #49
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Default Re: Connecting Two Batteries together

Dang, Mike, ya beat me to that one!
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Old 01-17-2012, 04:15 PM   #50
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Default Re: Connecting Two Batteries together

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Originally Posted by pitman View Post
In series, the voltage is cumulative. In parallel its current is cumulative.
Add 'em up!
Measure w/your VOM/multimeter and it will be obvious. If you wanted to have 24 volts, buy two more batts.
They cannot both be cumulative. In series, (+) of one hooked to (-) of the other is cumulative. (+) to (+) and (-) to (-) remains 6 volts but gives more amperage.
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Old 01-17-2012, 04:27 PM   #51
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Default Re: Connecting Two Batteries together

A little off topic but the 1960 MGA I used to have had two 6 volt batteries from the factory. There was a battery box in the floor behind the seats with one battery in each and the connecting cables run under the carpet to connect them.

The Brits had a unique take on all things electrical.
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Old 01-17-2012, 04:42 PM   #52
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Default Re: Connecting Two Batteries together

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Originally Posted by Willy301 View Post
They cannot both be cumulative. In series, (+) of one hooked to (-) of the other is cumulative. (+) to (+) and (-) to (-) remains 6 volts but gives more amperage.
More amperage and cumulative current are the same thing, aren't they? That's what he said.

Quote:
Originally Posted by aaggie View Post
A little off topic but the 1960 MGA I used to have had two 6 volt batteries from the factory. There was a battery box in the floor behind the seats with one battery in each and the connecting cables run under the carpet to connect them.

The Brits had a unique take on all things electrical.
See post #42 above......
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Old 01-17-2012, 04:42 PM   #53
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Oh let add to the bull.Back in the day when 12 volts was un heard of,when a 6 volt car didn,t turn over fast enought you could take 2 6s in series get it going that way.The way batterys are made they are joined together + -+- , so +-+- is 12 volts
Back in the day...Love that one. My son's 1925 Dodge Bros. Coupe came from the Dodge factory with 12 volts!
12 volt systems have been around since before then. Do a google search.
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Old 01-17-2012, 04:47 PM   #54
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One thing not touched on here(maybe irrelevant) is the old "Orpin" switch sold by J.C Whitney, It was a system that (when wired correctly) connected two 6 volt batteries in series for cranking (switch was energized by starter button) but reverted to parallel as soon as you released the starter button. Crank with 12-run on 6. Had one in my F-100 for years.
Not irrelevant at all, just a great post script. With that switch, you could get a 12 volt hot start and when switched back to parallel you charged both batteries with a 6 volt generator!

Nice addition, Dale.
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Old 01-17-2012, 05:15 PM   #55
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Default Re: Connecting Two Batteries together

My motor home has 2, count them 2, 6 volt batteries wired positive to negative making `12 volts to the house
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Old 01-17-2012, 06:12 PM   #56
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Default Re: Connecting Two Batteries together

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Using 2 6v batteries was the way GM built some early 50's 12 volt Cadillacs...They had a long, narrow 6 volt battery in each front fenderwell, just ahead of the firewall. Yes, a real PIA to get to ! Two of our customers had them.

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No. Early 50s Cads were 6 volt and used one BCI Group 2, long skinny, battery
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Old 01-17-2012, 08:55 PM   #57
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Three pages to say the same thing?
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Old 01-17-2012, 09:02 PM   #58
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Default Re: Connecting Two Batteries together

If you need a cheap small battery that will work get one of those cheap jump start battery packs take it apart and there is one of those expensive glass mat batteries inside.
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Old 01-18-2012, 08:21 AM   #59
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Default Re: Connecting Two Batteries together

I think I am going to go that same route Grits.
I want to put 2 6 volt batteries in series under my sedan to get more clearance, the 12 volt one I have now is just to big.

Hell I'v got close to a 1000 batteries that I take care of and have several strings of 40 12 volt batteries wired in series to make up 480 volts and some strings that have 60 8 volt batteries to make 480 volts and one that has 80 6 volt batteries that make up 480 volts but the beauty of the optimas is that when laid on there side like pics above there is a ton of room saved.

Not a lot of room in an A to start with.
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Old 01-18-2012, 08:44 AM   #60
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Default Re: Connecting Two Batteries together

One advantage of 2 sixes in series if you have a car that was 6v to start with you can tap into the cable between the 2 and run the 6v accessories.
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Old 01-18-2012, 08:46 AM   #61
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Default Re: Connecting Two Batteries together

I like batteries.........................
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Old 01-18-2012, 09:15 AM   #62
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Default Re: Connecting Two Batteries together

Heres some batteries for ya 8 volt 750 pounds, $1000.00 each.

Just noticed this thread is almost a year old.
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Old 01-18-2012, 12:51 PM   #63
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Default Re: Connecting Two Batteries together

yes 2 - 6 volts wired in series will give you 12 volts the problem is you have a 12 volt charging system . You cant charge batteries in series only in parrell.
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Old 01-18-2012, 01:10 PM   #64
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Default Re: Connecting Two Batteries together

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yes 2 - 6 volts wired in series will give you 12 volts the problem is you have a 12 volt charging system . You cant charge batteries in series only in parrell.
MrC.
If the two 6-volt batteries are the same A/H rating, and in the same condition (not one new and one 10 years old) you can charge them in series.
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Old 01-18-2012, 03:52 PM   #65
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yes 2 - 6 volts wired in series will give you 12 volts the problem is you have a 12 volt charging system . You cant charge batteries in series only in parrell.
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