The device itself is nice and as others commented you will need a quite substantial wind if you want to produce significant amount of energy. That said, there are a couple of additional issues:
- to get good amount of winds, the turbine needs to be high and a 30' to 45' pole costs much more than the wind generator itself
- you might need an authorization from the town if you want to install such a big pole (some might not even allow it)
- keep in mind that when spinning the turbine generates a significant amount of noise and vibrations (increase with wind speed). We tried to install one on top of a building at work and the ceiling of the last floor was vibrating at a point that lights were shaking. So you definitely don't want to try that on your roof at home.
Note that this thing generates DC current and if you install it far from your house, you will need expensive cables if you don't want to lose too much by the time it reaches the inverter.
You can check [...]for the numbers of a live production of 1 solar panel and 1 wind turbine (this particular Sunforce model) in western MA.Get more detail about Sunforce 44444 12-Volt 400-Watt Wind Generator.
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