Building A Home Wind Turbine - DIY Turbine - Off Grid Living!
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Published 2019-03-30
For details about how to build, check out the build article:
renewablesystemstechnology.com/project-blog/how-i-…
See this off grid turbine producing peak power: • Off Grid Reaper Wind Turbine Producin...
In this video I show how I built a home wind turbine for my property. This is an efficient DIY turbine that's built for low wind environments and is perfect for off grid living. It has a 12 ft (3.7 m) diameter rotor driving two 12 coil/16 pole axial flux air core (ie coreless) permanent magnet generators with a power potential of up to 3 kWp in a ~30 mph wind stream. Start up speed is around 2-3 mph, cut-in is around 5-6 mph. In an area with a mean annual wind speed of 11 mph (5 mps) or higher, this turbine will produce 500 kWh+ of energy every month with a mean output of 800-1000 watts, nearly enough to take an avg home off the grid (see links below).
The follow-up performance videos show over 2600 watts in a 26 mph wind stream. You can find them on my channel or at the end of this video. Pay attention to the controller AND anemometer display beside it. Refer to the wind power equation to compare the output and efficiency to what science says it should be:
P = π/2 * r² * v³ * ρ * η
where r² = rotor radius squared in meters
v³ = wind velocity cubed in m/s
ρ = is air density in kg/m³, typically ~1.23 kg/m³ but will vary slightly with temp and elevation
η = combined efficiency of the turbine (blades) and generator, typically between 30-45%
No wind turbine will ever be more than 59.3% eff. It's called the Betz limit. Google it for more info. But using my turbine specs to calculate theoretical output and compare it with actual peak output documented in the follow up video, we get this:
Turbine rotor diameter = 12 ft, or 3.65 m, radius = 1.83m
Wind speed = 26 mph, or 11.6 mps
Mean efficiency = ~32%
P = 3.1459/2 (1.83² * 11.6³ * 32%)
= 1.57 (3.35 * 1560.9 * 0.32)
= 1.57 * 1673.3
= 2627.06 watts
Be sure to check out the build article link above to learn more about how to build a wind turbine and get the plans.
Wind atlas
www.windatlas.ca/nav-en.php?field=E1&height=30&sea…
Energy production estimates
www.windatlas.ca/rose-en.php?ni=1117&nj=380&height…
Plans w/ step by step instructions:
resystech.com/3-kw-wind-turbine.html
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