displaying posts 1 to 11 of 11

Author Subject: Battery to boot cable size
pugheaven

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Post #1
Hi, iv done a search and found alot of it usefull, however im still unsure what spec cable to go for.
Im looking at using 175 amp 25mm cable from battery + to the kill switch in the engine bay then use same size as before for the starter, fuse box ..

Is the 175 amp 25mm cable ok to use, or is it over kill?

Thanks

Ollie
Posted 16th Oct 2009 at 01:16
mr swampy s16

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Post #2
135amp is fine.
Posted 16th Oct 2009 at 01:49
pugheaven

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Post #3
Thanks
Posted 16th Oct 2009 at 01:55
farmer

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Post #4
I dont think you will get 175A from 25mm cable tbh, not without damaging it! perhaps for a very very short periord it may be ok, but I personally would be running a 50mm cable in for a battery relocation (0awg).

25mm cable is about 120A rated tops I would say, even for tri-rated (fine stranded)
I know that would be fine to run the car, but the cold cranking current can run into very high numbers, added to the fact that the high current draw will increase the volt drop for the cranking period, so the battery will be having to work harder.

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Posted 16th Oct 2009 at 02:48
mr swampy s16

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Post #5
135amp is 20mm square and will be more than fine.
Posted 16th Oct 2009 at 02:54
pugheaven

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Post #6
Just looked on ebay and you can get 170 amp 25mm2 or 135 amp 20mm2.
Think im going for the 135 amp 20mm.
Think 0 gauge would be over the top, bmw's like the 8 series only had 25mm2 cable going from bonnet to boot.
Looking at getting mine from http://www.kojaycat.com
Posted 16th Oct 2009 at 02:58
phillipm

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Post #7
For that running length I'd be using at least 170amp otherwise the voltage drop in winter may become an issue.

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Posted 16th Oct 2009 at 03:01
pugheaven

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Post #8
Will it be a prob if i do have a larger dia cable than needed?
Posted 16th Oct 2009 at 03:04
jonnie205

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Post #9
In the rally cars we run 30mm, this is more than enough and starts high compression pinto engines even when they are hot and compression is sky high
Posted 16th Oct 2009 at 03:04
phillipm

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Post #10
pugheaven wrote:
Will it be a prob if i do have a larger dia cable than needed?


No

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Posted 16th Oct 2009 at 03:04
pugheaven

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Post #11
Didnt think so, 170 amp 25mm it is then.
Only down side more
Posted 16th Oct 2009 at 03:05

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