Valiente, that's the way to go as far as being away from the dock. I lived off the grid for ten years using solar, wind and a diesel genny. I always used the genererator for big loads and the inverter for everyday small loads. The nice thing about using the generator when you need a tool, or in our case, doing the household laundry etc, twas that the battery bank was topped off nicely at the same time.
I added wind because of the limited sun light in the fall and winter, but I still had to fall back on the genny quite a bit during the short days. I would think you would get the same results with wind in a sheltered anchorage. I didn't find it was cost effective. I felt I was in a windy location on a lake shore but it was usually gausty and not consistant enough. I think your portable will prove to be a very versatile item on a long term voyage.