"dg" wrote:
I noticed a wind turbine in B&Q, and it is nothing more than a motor,
on a pole with a propellor and some box of electronics.

How are these valued at over £1500 when it seems it can be made for a
fraction of that? How much would the parts be?

dg
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It is one of the more difficult diy projects but you can definitely build
your own. There's lots of info on the net, e.g.,
http://www.britishwindenergy.co.uk/you/byo.html
Good luck!