I suggest you take a look at the Guide available on this site here at the Turbine Buyers Guide.

Personally, I have a 10kW Bergey, which has had no down time since install 4 years ago and produces, on average 14,000 kWh p.a. on my site in North Yorkshire (5.2 m/s). A neighbour with the same turbineon a better site has been averaging between 17,000 - 18,000 kWh p.a.

Hope this helps.

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Peter