Wire size

pvb

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As large as possible...

As large as possible (within reason) so as to minimise voltage drop and heating of cables. As a minimum, I'd go for 10 sq mm.
 

pvb

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[ QUOTE ]
I would also go for 10mm2(AWG 8) that will give you a voltage drop of less than 0.5% (0.05V)...

[/ QUOTE ]Pleased that you agree that 10 sq mm is a good choice, but I'm afraid your voltage drop calculation is wrong. When calculating voltage drop, you need to consider the entire circuit - there and back - so you're looking at 3m of wire, and the drop would be around 1% (0.1V).
 
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