Using desktop with batteries is a stupid thing on a small boat - it
consumes 100Watt easily, plus the LCD another 30-40Watt, since it's
bright and not designed to save power. And you cannot suspend it. Laptop
consumes 60-80W and has several levels of power saving.

Good point

And like I said earlier maybe it best to use a laptop
anyway for above reasons.

Also the economies of scale give us good deals on
laptops