Two 8'Ds or even going with 4 since you are going to be off the grid would be your best bet. Especially with the quality of crap that is made these days. Two of them should spin that 8.3 for about 30 mins straight if you have a gear reduction starter on it. You could put a lockout switch to let the other 2 engage if you need the extra power to start. or you feel like jump starting a C-130 if you come across one needing it.