ORIGINAL: Umi_Ryuzuki
With a ship that large, you won't need solar.
My 6'-8" light cruiser could run around the pond all day on a one 6v-7ah gell cell.
It could speed around quite well on 12volts. The batteries only weigh about 10 pounds, so
you will be able to load two or more batteries into the boat at the size you are proposing.
With some careful planning and ingenuity, you should be able to do everything you have proposed.
[8D]
I agree! Take it one step at a time! Some projects last months and years but if you plan well, budget, and stick to it you'll get it done.