This tool will help you determine the diameter that your wind generator will need to be to generate the power you're looking for. It's quite simple to use and it will save you quite a bit of time.

How To Use

Select Output Power

Here you simply need to enter the amount of power you want to produce in watts. For example, 2Kw would be 2000 watts so you'd enter that.

Select Blade Efficiency

Now it gets a little bit tricky. The efficiency is a percentage expressed as a decimal. So, a blade efficiency of 49% would be 0.49. You can't go higher than 59% because that's the theoretical maximum amount of power you can get from the wind. If using PVC blades enter a value from between 0.18 (18%) up to 0.25 (25%). If you're buying blades (I like windmax) you can enter the efficiency that's provided (windmax blades are 49% or 0.49).

Select Motor Efficiency

No motor is 100% efficient although some are better than others. If you're using a permanent magnet motor (such as the ones from windblue) you can enter 0.8 (80%). Any other motor a value between 0.65 (65%) and 0.75 (75%) will give you pretty accurate results.

Average Wind Speed

The average wind speed is in meters per second. For example, 5 m/s is equal to roughly 11 mph winds. 6 m/s is equal to 13.5 mph winds. Any higher or lower you can add or subtract 2.25 (roughly). A value of 5.5 m/s is good for most normal use, but you should check your wind maps to see what the average wind speed in your area is.

Click Calculate

Now it's time to figure out how big your blades should be. I should note that the easiest way to decrease the size of blades you need is to increase the wind speed. You'll notice a huge difference even changing the wind speed by 1 m/s.

If you have any questions feel free to leave a comment or use the contact link at the top of the page.

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