Battery wire size ?
 

I have a question about wiring up my batteries. I can get a hold of 2/0 or #2 wire for free. Chemical and gas resistant. I was thinking of using this to run from my dual battery switch to my batteries. This wire is stranded but not stranded with as thin as the marine grade wire which I know is more flexible. I don't need flexibilty for the run I'm doing. I will use the marine cable to the motor ( outboard )though. As far as current capacity, I'm assuming there is no differrence. Does anyone have thoughts ? Thanks

Without getting too technical, the max amps for wiring a chassis (Very very conservative figure ) for that wire is 181 amps. Your power drop, assuming a 20 foot run, 12 volts and 100 amp load would be about 0.32v or, put another way, the voltage would be 11.68 volts on the other end of the circuit. In careful engineering the voltage drop, insulation temperature limit, thickness, thermal conductivity, and air convection and temperature should all be taken into account but are not relative here.

To answer your question, the thicker the copper strands the more brittle and less flexible, but 2/0 AWG (American Wire Gauge) is still 2/0 AWG. Presuming both are copper there is no difference.

#2 should be fine for an outboard that doesn't use a computer, but if you can get it for free, might as well use the 2/0.

I just ran 4 gauge marine tined wire 20 ft in my boat and it works great!! I use to lose so much power when using the trim tabs that the low voltage warning use to go off on my fish finder and GPS, No more.

And if I read this right you are just going from the switch to the battery's so its not going to be long at all, You should be fine

http://www.wellcraftv20.com/gallery/...24_G.sized.jpg

Thanks guys you helped me make my decision

Hey Joker, how bout commin' off some of dat free 2/0?!

USCG Boating Handbook-Electrical questions
 

http://www.uscgboating.org/regulatio...al_part3q.aspx

This link may help when wondering if you are doing something wrong.