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Old 08 February 2007, 14:28   #1
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Battery Cable size

Does anyone know what size of battery cable to use for a 150hp installation. These are the main cables from battery to outboard.
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Old 08 February 2007, 15:12   #2
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25 mm Welding cable should be ample, the reason i say Welding cable, is that you can pick it up for a lot less!!!
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Old 08 February 2007, 15:19   #3
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I put 40mm on are 150hpdi on about a 4.5 meter run.

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Old 08 February 2007, 16:07   #4
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Quote:
Originally Posted by RIB BOI View Post
I put 40mm on are 150hpdi on about a 4.5 meter run.

RIBBOI
Wow 40mm2 that's BIG. Did you manage to get terminals that would fit on the end without being overkill at the outboard end?

I thought that 25mm2 would be OK.
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Old 08 February 2007, 18:27   #5
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25 should be fine, its only a petrol engine of what, 2.5 to 3 litres capacity at most? I'd be more worried about how thick the insulation was on something like welding cable from a chafing point of view - the battery lead to my outboard is encased in a massive rubber armouring layer which makes it very resistant to chafing.

My jump leads at work are 35mm sq and I think they are rated up to 4 litre diesels, and diesels take much more ooomph because of having about double the compression ratio.
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Old 08 February 2007, 18:29   #6
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Looking at my marine electronics catalogue, the starter cable is rated as:
  • 170A - 25mm2
  • 300A - 40mm2
  • 350A - 50mm2

If your going for tinned cable then its rated capacity will be slightly lower than above.
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Old 08 February 2007, 18:35   #7
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That's great. I can aquire some copper 25mm2 and should be easier to source some terminals for. Thanks guys.
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Old 08 February 2007, 18:58   #8
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Welding cable is actually quite tough-it gets a lot more abuse than you'd think. It's nice and flexible too.
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Old 09 February 2007, 02:56   #9
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What engine is it as some require more amps than others

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Old 09 February 2007, 07:48   #10
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Just talking in general terms James. No specific outboard in mind.
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