Yeah, running that thing to charge via DC @ 8 amps, that's efficient, alright... :-)
Jon, I agree with you most of the time, but some folks have to charge their batteries. So, should they sail with the engine running, or drop sails and motor, or sail and run a small generator. Actually, I would rather sail and run the small gen. I don't see the problem.
Well, we don't know what sort of boat we have here, or the type of sailing/cruising being done, so... But I have to charge my batteries just like anyone else, just seems to me there are better options...
I'll admit, I'm overly cranky about the proliferation of these things... I suppose I just wonder how people do without them before they became so popular... :-)
To each his own, but if I had no other means of charging the batts, I'd still be inclined to run the engine for doing so... No fussing with gasoline, having to protect the unit from the elements, the risks inherent with carbon monoxide, etc...
You make a good point, however... all things being equal, I suppose I would much prefer if folks ran these generators when they were under sail, rather than after having arrived in an anchorage :-)