Sactownog

6 volt starter turn over slow or fast?

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4 hours ago, Sactownog said:

OK, 

 

SO 1 GA WIRE IS OK????

 

I would suggest 1/0 or 2/0. See post #9 on page one for the difference in sizes.

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Resistance in wire

image.thumb.png.44950037431030c528f0da898316bfcd.png

 

The resistivity is fixed by the material. Clearly, the larger the wire, the lower the resistance. Remember that A = π.r2 so a wire of twice the diameter has a quarter the resistance.

 

Current I = V/R. So for maximum current, you need the smallest reasonable R. With 6 V, there aren't many Volts available to lose through resistance, so use a big wire.

 

1 AWG = 0.2893 mm dia. and 406 Ω/m. https://www.rapidtables.com/calc/wire/wire-gauge-chart.html

 

00 or 2/0 AWG = 0.3648 mmdia. and 255 Ω/m or a 37 % reduction in resistance for a 26% increase in diameter.

 

And with 37 % less resistance, you can draw 58 % more current to operate your starter.

 

So my advice is to use the bigger cable!

Edited by Spinneyhill (see edit history)
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