Wind Generator Necessary ?

[Preposterous]

Are wind generators really that necessary? I am having trouble justifying the cost of one when I have a perfectly good diesel engine to charge my batteries. With that said, I am planning on living on moorings for the majority of my time when I take this journey down south.

The questionable electronics would be perhaps a window unit a/c and a microwave? Can a WG generate enough juice to take care of the use (Night time only).

Has anyone had success with mounting a window a/c unit on a Catalina 34'? Remember, my coffers are down quite a bit.