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Unread 04-29-2013, 09:48 AM   #11
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Default Re: Earth wire through OBC

That's a good question SC!
I'm just relaying what I've read... I'm sure JohnnieB or Tahoedawg could explain it in more depth!

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Unread 04-29-2013, 10:13 AM   #12
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Default Re: Earth wire through OBC

I did some research when nobogez42 posted his pictures....
As far electric conductivity is concerned and assuming copper being the reference for comparisons, aluminum would be the second best choice. The problem with aluminum is that it oxidizes really quick and that is not a good thing for high amperage... It is also hard to keep anti-oxidizing paste on it due to water exposure.
If you move to alloys, Brass is the winner. Interesting enough even though Brass is 60% copper and Silicon Bronze is about 96% copper, as far as electrical conductivity, Brass is twice as conductive.
Stainless Steel is much more inferior than Brass on conductivity as well.
I would use 3/8 bolt (more cross section than 2Ga cable) so you can use the same size lugs as the battery posts. I would also use some shrink tubing around the threaded portion that goes in the OBC to avoid abrasion in case the assembly gets a little loose.
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Unread 04-29-2013, 10:30 AM   #13
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Default Re: Earth wire through OBC

Sergio, I was wondering about that as well, is it possible that the metal stud is not as good as the original 6g cable due to inferior conductivity?
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Unread 04-29-2013, 10:42 AM   #14
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Default Re: Earth wire through OBC

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Originally Posted by Speedchaser View Post
Sergio, I was wondering about that as well, is it possible that the metal stud is not as good as the original 6g cable due to inferior conductivity?
It would need to be copper and larger in diameter to be as conductive as the cable. Stranded wire is much more conductive than solid (stud or bolt). The finer the strands the great the conductivity since eltricity travels around the circumference
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Unread 04-29-2013, 11:04 AM   #15
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Default Re: Earth wire through OBC

Skin effect only affects AC voltage/current. The main reason to use stranded cable in battery cables is flexibility.
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Unread 04-29-2013, 11:11 AM   #16
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Default Re: Earth wire through OBC

Speedchaser,
2 ga cable is about 1/4 inch diameter (copper only), 00Ga is less than 3/8 diameter. I would think a 3/8 bolt should be plenty, and it looks like lots of folks have done it without problems.
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Unread 04-29-2013, 11:18 AM   #17
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Default Re: Earth wire through OBC

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Skin effect only affects AC voltage/current. The main reason to use stranded cable in battery cables is flexibility.
Thanks for the info. I learn something new every day. Maybe I didn't lose as much amp capacity as I had feared with the brass bolt.
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Unread 04-29-2013, 12:59 PM   #18
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Default Re: Earth wire through OBC

I am sorry, I meant to say use 5/16 bolt which is obviously the stud size of the battery post.
And yes, I think Brass is the best choice for material.
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Unread 04-29-2013, 10:02 PM   #19
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Default Re: Earth wire through OBC

Thanks for all the info peoples, I didn't even think I would get a reply .
Looks like i'm off to the shops to try and find a brass bolt.
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Unread 04-30-2013, 07:10 AM   #20
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Default Re: Earth wire through OBC

Hey Phillz I did the brass all thread stud with the 4 nuts 2 normal and 2 nylon locknuts so as it would stay snug and not vibrate loose, Bunnings stocks all you need. Cheers
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