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Electric Boat Costs 40–50€ to Cross Baltic Sea, vs 750€ Refueling Gas Boat
(cleantechnica.com)
This is a most excellent place for technology news and articles.
Super easy to retro fit to be able to pull it out the water when its a light wind too, great for anybody wanting to reduce using their main engine as a battery charger.
Solar is great on sail boats but often the sails block the sun when they are out so its difficult to get full utilisation. Something like a hydro generator works perfectly with a good sized solar install for a sail boat to cover at anchor and under sail.