I thought sails were the way you move the boat(?) You know, FREE power from the weather !
This motor stuff was supposed to be how you negotiate harbors and calm wind conditions.
The investigation of a more-efficient charging system is commendable, but the return on investment(ROI) for this system must be about 100 years. The guy in the sailing video tells us we "expect" these luxuries. I don't. In energy management, the "low hanging fruit" is always to reduce consumption first, so I'd get rid of that toaster of his first. It's all in your perspective. It's just that he's never been moose hunting with me camped on a mountain in a snow flurry making lattes on a tiny MSR whisperlite gas stove. The secret to happiness is to put Old Grandad in the coffee. Now That's luxury!
I must admit, using electricity to cook on a boat with would get rid of my propane. I hate my setup—its cares me.