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Hello,
It really depends on how hard the wind blows. My family of four in a pretty typical house use between 550 and 700 KWH in a month. So, if the wind blows half the time, the 2kw twin rotor model above would be enough to offset our use.
It starts at 8mph wind speed and peaks at 30mph. I think I would need to get the low wind speed model, which has 10 foot diameter rotors, instead of 7 foot; and it costs $300 more. Very interesting stuff.
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