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Lead Acid Battery in parallel

J

Jack// ani

Jan 1, 1970
0
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
 
R

Rich Grise

Jan 1, 1970
0
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
 
P

Pooh Bear

Jan 1, 1970
0
Rich said:
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
 
S

Sjouke Burry

Jan 1, 1970
0
Pooh said:
Rich Grise wrote:




Me neither. It sounds very odd.





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.
 
M

Michael A. Terrell

Jan 1, 1970
0
Pooh said:
Me neither. It sounds very odd.


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.
 
J

Jack// ani

Jan 1, 1970
0
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
 
R

Rich Grise

Jan 1, 1970
0
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
 
R

Rich Grise

Jan 1, 1970
0
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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