Posted: Mon Mar 16, 2009 2:00pm

I need to move my battery iscolation switch about 2 to 3 meters from the battery bank(its currently less than a meter). Does this additional distance mean that the cable amp rating should be increased?

Posted: Mon Mar 16, 2009 2:46pm

Ideally Yes if the cables were absolutely to spec before, but I have no idea what they are. I doubt using the same size would make a major difference to the starting but the extra resistance could make it take longer to charge the batteries. If we assume the relevant alternator has an 80 amp output then 40mm cable would produce a voltdrop of 0.13 volts with 2m cables and that would be acceptable. However basically on battery cables "the larger the better" rules.