regen on the prop and from solar

I didn't think of that. That makes it even better.

Honestly same goes for propane for cooking.

Going electric on boats removes multiple complicated and flammable systems with one.

I'm sold. I don't expect I'll ever get a sailboat myself (fear of open water in multiple flavours that I'm not sure I'll ever overcome), but if I do, Electric it will be.

You can go off grid for as long as your food lasts.

That'll be the bigger issue, considering how that food will get to the places you'd stock up. But electric trucks seem to also be a growing thing, so maybe there's hope.