Battery Leads

 
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Bill B
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PostPosted: Mon Feb 12, 2018 6:19 pm    Post subject: Battery Leads Reply with quote
Hi all
Simple question , I want to make up new Pos and Neg leads with terminals , that's easy enough there's tons of stuff on e bay , but what diameter or amp rating should the leads be ?!, given this is a 12V Neg earth

Ta Bill
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Adie
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PostPosted: Mon Feb 12, 2018 10:15 pm    Post subject: Reply with quote
A Series alternator produces around 40 amps, a 200Tdi alternator produces around 65 amps, a 300Tdi alternator produces around 90-100 amps.

Have you a standard alternator on your Series 3?
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Adie
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PostPosted: Mon Feb 12, 2018 10:20 pm    Post subject: Reply with quote
From another forum:

Generally I believe that 40 sq mm is commonly used for battery cables (good for around 300 Amps continuous)

Note that a starter motor can draw up to 600 Amps peak but a more common use case is around 300 Amps (but again only for a short period of time).

Other info that might help decide on the size is a lot of the FIA master switches are rated 100 Amp continuous 500 Amp peak this would suggest 16 sq mm (110 Amp continuous)

But I would not go anything less than 25 sq mm
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Adie
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PostPosted: Mon Feb 12, 2018 10:22 pm    Post subject: Reply with quote
If you have a winch (which should be wired independently) the common minimum is 35 sq mm
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Bill B
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PostPosted: Fri Feb 16, 2018 12:57 pm    Post subject: Battery Leads Reply with quote
Thanks all

Got everything through Vehicle Wiring Products , not too pricey either

Bill
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