A 6 volt starter motor will last longer on 12 volts then it will on 6. There is very little difference in them.
I vote for the 12 volts & an alternator. There is a lot of darkness up there, You will be useing lights most of the time. At slow speeds you will still maintain the bat.
Last edited by Wrenchbender Ret.; 08/01/2011 3:18 PM.