You won’t ned to run the engine much if you have a solar system to run the yacht. Most people who run their engines every day do it to keep the refrigeration system running. I keep a running total of the solar power I have collected over the years, and so far I have saved over $10,000 in fuel bills. I guess I burn 100 gallons of fuel a year powering through windless days, and getting in and out of ports.

Fuel is available everywhere. You don’t need to carry more than 40 gallons of fuel. This is helpful because it means you can look at light displacement yachts which normally have small fuel tanks. You don’t need a big engine, nor a big alternator on a light boat. I replaced my 35 HP engine after 35 years for about $8,000 total installed cost - that’s an annualized cost of $228 a year.