Originally Posted by Captain Canuck
On the upside, you'd never have to worry about overheating or wearing out the batteries or the motor. Working so far below spec, they'd probably outlast the boat.
Lithium Batteries have limited Shelf Life from Date of Manufacture, even unused. The _original_ Li Battery on my backup-to-the-backup Powerbook G4 just died after ~8 years, even though it was plugged in to the Charger 99% of the time.
Note that I was only getting two years out of the Lead-Acid batteries in my old Powerbook 100, and when those Batteries died, they had a nasty tendency of taking out the fuse on the Motherboard. So things have improved.
Charging might be an issue, though. At 85kWh, that's a 28 hour recharge from empty at a standard 30A 120V shore power connection, or 7 hours at a 50A 240V.
Or ~850 hours out of a 100 watt Solar Panel= ~110 days, assuming good conversion efficiencies and ~8 hours of Sunlight a day. Say three months in reality to recharge, assuming no other Electrical load.
That's the energy content of ~2 Gallons of Diesel Fuel...
and by now some wheels should be spinning...
Diesel Fuel Cells!
Diesel-Powered Fuel Cell Produces Clean Electricity - IEEE Spectrum
(Generating Diesel Fuel on the run is difficult, unless one does a fair amount of deep-fat frying with vegetable oils.)
The _only_ reason that Electric Cars on the road, like the Tesla, makes sense now is that the Charging Infrastructure mostly already exists. (Formula E is making inroads in off-road Motorsports, and I think that it's really cool. Still, only a handful of Tracks are equipped so far.)
Such Infrastructure does _not_ exist for Sailboats, and it is very unlikely, given the diminishing market, that it ever will.