Gary:
Nice installation and pics. Your calc's look good, but there are some other things also to consider.
I already have a tower, and in fact my site, is such I can use a very short tower, like 10 or 20 ft. My 10 KW generates 22 KWH daily, yearround, on a 55' tower. So, I think I can get 2-3 KWH daily, more in winter.
Secondly, I plan to use the turbine yearround; for the radiant system in the winter, and domestic hot water in summer, so I have I have 12 mo use. Your system is unavailable six months, right?
I do not have a conducive site for an installation like yours, and another issue, would be drifting snow covering the panels, which I note in your pics is apparently an problem in Bozeman. I have enough problem plwing out my driveway at times, not sure I want to clear panels.
having lived with windpower near 3 years, one of the things I enjoy very much is the virtually zero maintenance.
Thanks for your comments,
AdobeJoe