| Author |
Message |
Jack// ani
Guest
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 Posted:
Fri Dec 09, 2005 5:35 pm Post subject:
Lead Acid Battery in parallel |
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Hi all,
Why do manufacturer specify number of battery that can be shunted
together, so as to increase the AH rating?? Is there any hazard
involved....if I go beyond this?
Thanks
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Pooh Bear
Guest
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| Posted:
Sat Dec 10, 2005 1:35 am Post subject:
Re: Lead Acid Battery in parallel |
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Rich Grise wrote:
| Quote: | On Fri, 09 Dec 2005 08:59:05 -0800, Jack// ani wrote:
Hi all,
Why do manufacturer specify number of battery that can be shunted
together, so as to increase the AH rating?? Is there any hazard
involved....if I go beyond this?
I've never seen such a spec.
|
Me neither. It sounds very odd.
| Quote: | As long as the batteries are the same
chemistry, same voltage/capacity rating, and maintained properly, you
can put any number of them in parallel - go look at the battery banks
at the phone company sometime. :-)
Of course, your wiring (or bus bars) have to be capable of handling
the current.
|
A study of submarine batteries should prove interesting in that regard.
Graham |
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Rich Grise
Guest
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| Posted:
Sat Dec 10, 2005 1:35 am Post subject:
Re: Lead Acid Battery in parallel |
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On Fri, 09 Dec 2005 08:59:05 -0800, Jack// ani wrote:
| Quote: | Hi all,
Why do manufacturer specify number of battery that can be shunted
together, so as to increase the AH rating?? Is there any hazard
involved....if I go beyond this?
|
I've never seen such a spec. As long as the batteries are the same
chemistry, same voltage/capacity rating, and maintained properly, you
can put any number of them in parallel - go look at the battery banks
at the phone company sometime. :-)
Of course, your wiring (or bus bars) have to be capable of handling
the current.
Cheers!
Rich
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Michael A. Terrell
Guest
|
| Posted:
Sat Dec 10, 2005 1:35 am Post subject:
Re: Lead Acid Battery in parallel |
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Pooh Bear wrote:
| Quote: |
Rich Grise wrote:
On Fri, 09 Dec 2005 08:59:05 -0800, Jack// ani wrote:
Hi all,
Why do manufacturer specify number of battery that can be shunted
together, so as to increase the AH rating?? Is there any hazard
involved....if I go beyond this?
I've never seen such a spec.
Me neither. It sounds very odd.
As long as the batteries are the same
chemistry, same voltage/capacity rating, and maintained properly, you
can put any number of them in parallel - go look at the battery banks
at the phone company sometime. :-)
Of course, your wiring (or bus bars) have to be capable of handling
the current.
A study of submarine batteries should prove interesting in that regard.
Graham
|
I saw one of those overgrown stereos in a mini pickup truck go up in
flames when one of the seven 12 V lead acid truck batteries failed and
shorted out the others. There were no fuses, because "They take away
points an the contests" so everything burnt. The two guys in the cab
barely made it out because the rear of the cab was cut out. After that
fire I sold a lot of surplus 90 Amp DC circuit breakers at the asset
recovery company I was working for.
--
?
Michael A. Terrell
Central Florida |
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Sjouke Burry
Guest
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| Posted:
Sat Dec 10, 2005 1:35 am Post subject:
Re: Lead Acid Battery in parallel |
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Pooh Bear wrote:
| Quote: |
Rich Grise wrote:
On Fri, 09 Dec 2005 08:59:05 -0800, Jack// ani wrote:
Hi all,
Why do manufacturer specify number of battery that can be shunted
together, so as to increase the AH rating?? Is there any hazard
involved....if I go beyond this?
I've never seen such a spec.
Me neither. It sounds very odd.
As long as the batteries are the same
chemistry, same voltage/capacity rating, and maintained properly, you
can put any number of them in parallel - go look at the battery banks
at the phone company sometime. :-)
Of course, your wiring (or bus bars) have to be capable of handling
the current.
A study of submarine batteries should prove interesting in that regard.
Graham
You will get a very interresting expierience if one of |
the sets fails short ciruit!.With to many in parallel,
a nice explosion should follow.
If possible,shop for a larger single unit. |
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Jack// ani
Guest
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| Posted:
Sat Dec 10, 2005 9:35 am Post subject:
Re: Lead Acid Battery in parallel |
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Well, I read somewhere.....you should not place more than 3 batteries
in parallel, also the AH rating of all those batteries should be
equal!! Maybe its not true....just want to confirm!!
Thanks again |
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Rich Grise
Guest
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| Posted:
Sun Dec 11, 2005 1:35 am Post subject:
Re: Lead Acid Battery in parallel |
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On Fri, 09 Dec 2005 23:42:46 +0100, Sjouke Burry wrote:
| Quote: | Pooh Bear wrote:
Rich Grise wrote:
On Fri, 09 Dec 2005 08:59:05 -0800, Jack// ani wrote:
Hi all,
Why do manufacturer specify number of battery that can be shunted
together, so as to increase the AH rating?? Is there any hazard
involved....if I go beyond this?
I've never seen such a spec.
Me neither. It sounds very odd.
As long as the batteries are the same
chemistry, same voltage/capacity rating, and maintained properly, you
can put any number of them in parallel - go look at the battery banks
at the phone company sometime. :-)
Of course, your wiring (or bus bars) have to be capable of handling
the current.
A study of submarine batteries should prove interesting in that regard.
You will get a very interresting expierience if one of
the sets fails short ciruit!.With to many in parallel,
a nice explosion should follow.
If possible,shop for a larger single unit.
|
Well, if you're handling 2.5 cm x 10 cm (1" x 4") solid copper bus bars,
you'd have to be supremely clumsy to cause a short. ;-) Like Pooh said,
check out some submarine batteries. Or, if that's inconvenient, go
to your local railroad roundhouse and look at some locomotive batteries. ;-)
Cheers!
Rich |
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Rich Grise
Guest
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| Posted:
Sun Dec 11, 2005 1:35 am Post subject:
Re: Lead Acid Battery in parallel |
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On Fri, 09 Dec 2005 20:27:52 -0800, Jack// ani wrote:
| Quote: | Well, I read somewhere.....you should not place more than 3 batteries
in parallel, also the AH rating of all those batteries should be
equal!! Maybe its not true....just want to confirm!!
|
No, somebody's blowing smoke up your pants.
AS LONG AS YOU PROVIDE FOR A BALANCED CURRENT PATH, it's indistinguishable
from one, larger, battery.
The bugaboo might be ensuring that your circut loads them equally, which,
if you're drawing hundreds of amps, might take a little bit of thought as
to the design, like big fat bus bars. :-)
And, oh, yeah, that idiot that left out the fuse because "it takes off
points" sounds like the perfect audiophoool.
Where do such stupid people get such huge piles of money to throw away
on that crap?
Good Luck!
Rich |
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neon
Joined: 25 Feb 2006
Posts: 570
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| Posted:
Sat Feb 25, 2006 3:37 pm Post subject:
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again i did not read all of the reply fact not all battery are created equal either in voltage or power output. put them in parallel and you are destroyng a good battery. you may put them in parallel if using a diode or worse a very small resistor. i like diode since it insure a dif. of .7 volts dif.
probably the manufacter imply that it is possible only if you know what you are doing. a note allways look away when jumping a car battery they do explode.and |
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