Your numbers are off by a lot. A Sprinter roof is around 100ft^2 (not sure why you're saying cubic feet, solar panels are flat and can't overlap). I live in a

Your numbers are off by a lot. A Sprinter roof is around 100ft^2 (not sure why you're saying cubic feet, solar panels are flat and can't overlap). I live in a 25ft shuttle bus. I have solar that covers the roof end-to-end, 1800W. It's a lot but nowhere near enough to recharge batteries to drive a vehicle of this size any reasonable distance.