Battery Battery positive Wire Amp Rating - Civinfo
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post #1 of 5 (permalink) Old 28th May 2019, 15:28 Thread Starter
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Battery positive Wire Amp Rating

Hi,

Whats the amp rating of the positive wire for the FN2 battery? I want to relocate my battery to the boot so need a long enough positive lead?

Thanks
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post #2 of 5 (permalink) Old 29th May 2019, 19:36
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Not sure on the rating of the standard cable im afraid.

But it's not just the current rating, but also the voltage drop. Will need a larger cable than the standard if you're running a longer length to keep the voltage drop roughly the same.
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post #3 of 5 (permalink) Old 29th May 2019, 19:49 Thread Starter
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Quote:
Originally Posted by Robbie View Post
Not sure on the rating of the standard cable im afraid.

But it's not just the current rating, but also the voltage drop. Will need a larger cable than the standard if you're running a longer length to keep the voltage drop roughly the same.
Nice one cheers.
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post #4 of 5 (permalink) Old 30th May 2019, 00:05
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The voltage drop depends on the current drawn and the cable's resistance (V=IR. Ohms law). But, as implied above a bit of wire that will take (say) 100A starting current with only a small drop in voltage will have a larger drop the longer it is.
So you really need to wire it with cable that is thicker than the existing battery to starter motor.
There are tables of wire current carrying capacity and resistance per metre (or whatever).
Having banged on about that, I have no idea of either the current rating of the existing cable or how much bigger your replacement needs to be. You should probably consult an auto electrician who can calculate the gauge needed once you have found the length it needs to be. My guess would be that it's between 2 and 0 AWG.

AWG tables are HERE
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post #5 of 5 (permalink) Old 2nd July 2019, 08:46
 
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Dear I am not sure about it.
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