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Nasher
Member Since: 07 Mar 2009
Location: Clanfield, North of Pompey - UK
Posts: 2686
  
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interesting, its suggesting that to run my 4x100W spotlights(@34A at 12V) on my roofbasket with a 5M cable run, battery, through car, out back through rear lights, and over roof to front of basket, which is probably more than 5M anyway, I should be using 35mm2 battery cable.
Sounds a bit heavy to me, but I'm no expert.
Nasher Heaven doesn't want me, and hell is afraid I'll take over.
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 21st Jul 2010 11:32 pm |
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anglefire
Member Since: 09 Mar 2010
Location: In the Club House
Posts: 4180
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What did you have the % volt drop set to?
Try it at a bigger acceptable volt drop, and see what that does. 2 or 3% should be ok.
TBH if you do the calc's on mains cable (Say the shower in your house!) and do it by the book, it comes out at about 50mm2 cable - whereas mot pu in 10mm2. Mark.
2006, D3 SE Auto - gone but not forgotten.
2014 BMW 530d M Sport Tourer.
1977 Triumph Spitfire 1500
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| 22nd Jul 2010 7:06 am |
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discoBizz
Member Since: 20 Sep 2008
Location: Manchester
Posts: 1416
  
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Yes, this tool does seem to be on the cautious side 
Came up with 50mm2 cable for a 60A surge draw (30A continuous) on 7m of cable at 3% tolerance (the rear power setup from the Optima)
Am using the 13.5mm2 cable that came with the Traxide for two days now testing without problems (yet, fingers crossed).
Apparently, the same goes for the Anderson plugs: a 50A rated one can handle up to 175A for a short time (a few seconds), so for jump starting even a 50A would suffice I am led to believe (after having ordered a 175A set - doh  ) ==> Guide - Inexpensive AV Modification
==> Guide - Extend the multimedia of your Discovery III (September 2011, v1.2 uploaded)
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| 22nd Jul 2010 7:35 am |
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UNG
Member Since: 20 Jun 2008
Location: Lancs
Posts: 753
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anglefire wrote:TBH if you do the calc's on mains cable (Say the shower in your house!) and do it by the book, it comes out at about 50mm2 cable - whereas mot pu in 10mm2.
Don't know how you are doing the calcs but I have never had it come out at 50mm2 for a shower unless you have a very power hungry shower "Never keep up with the Joneses. Drag'em down to your level. It's cheaper".
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| 22nd Jul 2010 8:15 am |
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