That web site says that at 15mph it puts out 3.6kw of electricity, now most people never see steady 15mph winds, a good wind site for most people is 12mph and if you have less then 11mph most people shouldn't bother, now I realize I sound like a nay sayer, but I've been around wind turbines all of my life and I like to see them work, I've also seen alot of them that don't work, I can't find a chart that shows it properly but it looks like there is almost 3 times the energy in the moving wind at 15mph then at 11mph, so if you have 11mph average wind speed at your site 60 feet or 90 feet up in the air your 5.5kw wind turbine kit will be putting out around 1.2kw if you are lucky, of course the real life output is dependent on alot more.
There was supposed to be a tour a while back of a guys place that appears to have a turbine like this but it never happened, I drive past it every once in a while and never have seen it spinning.
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