This is just you handwaving the problem away. You will need a very reliable supply of energy for this. It actual makes more sense to convert that green energy to something like hydrogen for powering ships. If done at scale, cost will be not much more than the cost of the wind and solar energy itself. Which is potentially very low. And nevermind the fact that you have nowhere near the capacity of batteries to power your ships.
> “Flat out denying the physics of this problem” you’re arguing that sailing ships don’t work.
The largest sailship ever has a displacement tonnage of around 5,000 tons. Modern cargo ships are closer to 250,000 tons. Sailships don't work at the scale you're imagining them. It is basically going back to the 19th century in terms of shipping capacity.
> Maersk the largest shipbuilder in the world already got flettner rotors to provide useful levels of propulsion, ADD a kite system and you’re traveling faster than commercial shipping doing slow steaming.
Skysail just reduces fuel consumption somewhat. It also seem to have disappeared as a serious idea about a decade ago: https://www.ship-technology.com/features/feature-skysails-br...