No matter what the design or if it's home built or mass produced a lot of people still over look the most important rule, the electricity is coming from the energy in the wind, the faster the wind speed the more energy is there to extract, thus the saying "more tower for more power" if your turbine is not up in the air then there isn't enough energy to extract and you should view the top of your roof the same as you would being a few feet off the ground in an open field, you need to be no less then 50 feet above anything and everything within 500 feet.
I've hung out with the guys from Other Power and they are great, they build awesome machines that work really well and they know their stuff, they also teach classes.
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