Well, here is my 2 cents worth. And I think worth every penny too!
10-12 years ago I put a 400W Air-X on my h40.5. My goal was to top off my house batteries after I left with my boat on a mooring, so that I would not have to run my genset excessively before I left. This goal was met very well. I could leave my batteries at maybe 85% SOC and they would easily top off in a few days.
However there were no loads on the batteries when the boat was left on the mooring. No refrigeration; nothing. My location was in Narragansett Bay, RI, and the average wind was under 10kts. The wind would typically come up around 10am and blow at 12-16 kts until about 4pm. My 400W Air-X would start charging over 10kt. So on an average day I might get 4 hours of wind over 10kts. That is not a lot of charging in my location.
Before considering a wind generator, you should determine the real wind speeds that you will actually see.
Now I have been in winds of 25-30 kts and in those conditions the wind generator pushes out 20+ amps, but that is not the average. I would guess that the average number of amp-hours that my wind generator produces is about 20Ah per day. That is nowhere near enough for refrigeration, and it might not be quite enough for all of the other DC loads depending upon what else you are running.
I think the first thing you need to do is to analyze how many Ah each load on your boat consumes in a day. Then you can have a good idea on what you can realistically supply from a wind generator. To do this, measure the current draw for each item and multiply by the number of hours you use it each day. Make up a table and tally the totals. This will give you the total daily power requirement.
If you still think a wind generator will meet your needs, I would look at the 200W units that begin charging at a lower wind speed. The maximum power will be lower, but the time that the wind will be in a range to produce power will be longer.
Of course if you have heavy winds every day for many hours, that could let you use a larger 400W generator.
Back when I installed my Air-X, solar panels were very expensive and much less efficient than they are today. Today I would go with solar as opposed to a wind gen, given my experience and state of the technology today.
But you said that you don't have room for solar panels, so maybe that option is out. But I would look closely and get creative with mounting. If you are giving up on refrigeration, a much smaller panel could supply all of your needs.
And, BTW, solar is quiet. Wind generators, not so much.
I hope this helps. NO refunds on the 2 cents......