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The power generated from a windmill depends on both the wind speed and the size of the blades.

Wind Power Chart
Output RatingBlade Kilowatt Hours at Various Wind Speeds
(watts)Diameter8 mph10 mph12 mph14 mph16 mph
100358111315
25041218242932
50052435465562
1,0007456586100120
2,0001180120160200240
4,00015150230310390460
6,00018230350470590710
8,00021300450600750900
10,000243705507309101,100

For Example, if the average wind speed at the site is 12 mph, a small 100 watt generator will turn out only 11 kWh, but a 2,000 watt generator will produce 160 kWh and a 10,000 watt generator will product 730 kWh.

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