Not a problem at all. It is a twin paddle wheeler. One paddle wheel propels the ferry and the other is connected to a generator to charge the batteries. To achieve this those brillient engineers up by the weed factory have designed a vessel with zero coefficient of drag, a paddle wheel of 100 percent efficiency and the other wheel connected to the generator is also 100% efficient and of course the generators are of equal efficiency as are the batteries and wiring. Those boys up there by the weed farm and factory are engineers of ability in the extreme!
Would I lie to you? I swear on my name (Joe Isuzu) it is all true, all of it! Now you know why I flunked physics and thermodynamics, and the concept of efficiency of energy transfer. Actually, I made an A. Entropy rules all.
They probably should have stuck to horsepower to move that thing. I mean, horsepower by horses walking a treadmill to power the paddle wheels. Safer, and likely more effective.