Friend here did an electric conversion of a pontoon boat as a covid lockdown hobby project. Got an electric marine motor from china, bank of batteries at the stern and a modest solar panel (his dock is north/south, so he can tie up with it facing south). Range is a few tens of miles, but it's a pontoon boat, that's plenty for a nice afternoon cruise on the river. The fact that it's almost totally silent is perfect for the application. Recharges on its own in a day or two, no shore connection needed.
