NEW BLUE MAX BELT DRIVEN GENERATOR 4500 Watts@120 volts. For specs and details go to Fabco.com you have to phone in for current price. My price with regulator is $500. My unit has never been installed as would be verified by an inspection of the wiring. This unit is used on ambulances and other emergency vehicles from what I can see this is their core business. When I bought mine I had a 5KW diesel generator and never got around to switching it out. This is the best system I can imagine for cruisers boat especially if you don't now have a diesel generator. Alternators clearly cannot produce enough juice at 14 V. With a modest charger you can top off the batteries, use tools and stoves during charging period and therefore will only require a modest inverter. The unit is small but heavy (32 lbs) and you very well might need a professional to install the unit. But you are going to get a reliable source of electricity for thousands less and absent the mess and fuss of a 5KW diesel generator or the danger of a gasoline generator placed on deck. If you're interested please go to the website and decide if my analysis is correct. phone Peter Denton-919-270-7501 or email-luxembergphd@gmail.com