The idea behind a marine wind generator is to supply some needed electricity on demand, or to top off your batteries while your boat is not in use. When you start to rely on solar and wind power, your alternator becomes a backup system marine wholesale. With your alternator as a backup, you'll enjoy lesser fuel consumption and more boating time. There must be a boating tax somewhere that demands everything with the word "marine" must be taxed 100 fold. It never fails, that the word marine means it costs more. I've seriously tried to find the difference between some ordinary goods and some marine goods... and just didn't' find a difference.