Wind-Solar Hybrid Powered
Repeater System
Wind turbine power
W
ind turbine powerWind turbine power
Wind turbine power
Wind is the “fuel” for your wind generator. The power in
the wind can be transferred to electric power. The
amount of transferred power is directly proportional to
the density of the air, the area swept out by the rotor,
and the cube of the wind speed.
P=½αρπr²v³
The power P available in the wind is given by:
P = power in watts
α = efficiency constant
ρ = mass density of air in kilograms per cubic meter
r = radius of the wind turbine in meters
v = velocity of the air in meters per second
Density
DensityDensity
Density
The higher a wind generator is from sea level, the lower
the air density. Air density is directly proportional to the
output of your turbine.
The figure below should be used in your calculation
depending on the height from sea level of your
installation site.
0 – 150 m 1 - 500 ft 100%
150 – 300 m 500 - 1000 ft 97%
300 – 600 m 1000 - 2000 ft 94%
600 – 900 m 2000 - 3000 ft 91%
900 – 1200 m 3000 - 4000 ft 88%
1200 – 1500 m 4000 - 5000 ft 85%
1500 – 1800 m 5000 - 6000 ft 82%
1800 – 2100 m 6000 - 7000 ft 79%
2100 – 2400 m 7000 - 8000 ft 76%
2400 – 2700 m 8000 - 9000 ft 73%
2700 – 3000 m 9000 - 10000 ft 70%
Radius
RadiusRadius
Radius
Depends on make and model of wind turbine which you
choose.
Velocity
VelocityVelocity
Velocity
Wind-Solar Hybrid power system
In order to design a wind-solar hybrid power system
you'll have to first determine your estimated electrical
needs and available resources to generate electric
power.
Check there are enough wind resources available at the
location , and check there is enough sun light available
at the location, to determine the type of generation
system to make.
67
v = velocity of the air in meters per second
Efficiency
EfficiencyEfficiency
Efficiency
Depends on make and model of wind turbine which you
choose.
Velocity
VelocityVelocity
Velocity
Wind maps are available for many countries which will
give you an idea of the wind resource at the site where
you are planning to install. Check out these maps and
see if you have sufficient wind resource.
Wind blow hours 5 hours 8 hours 12 hours
Mean
wind
Velocity
Gen.
output
Daily
mean
velocity
Gen.
power
Monthly
gen.
power
Daily
mean
velocity
Gen.
power
Monthly
gen.
power
Daily
mean
velocity
Gen.
power
Monthly
gen.
power
m/s W m/s Wh kWh m/s Wh kWh m/s Wh kWh
4 15 0.8 75 2.3 1.3 120 3.7 2.0 180 5.5
8 120 1.7 600 18.3 2.7 960 29.2 4.0 1440 43.8
12.5 400 2.6 2000 60.8 4.2 3200 97.3 6.3 4800 146.0
Reference of Wind Turbine Power generation figure, model Z-500 from Zephyr
Other considerations
Other considerationsOther considerations
Other considerations
• Wind speeds increase with height. In general, the
higher the tower, the more power the wind system
can produce.
• How many No wind days to cover
• How many No sun shine days to cover
• How to split duty between wind and solar power
• Wind And Solar Often Have Seasonally
Complimentary Resources
− Summer: Low Wind / High Solar
− Winter: High Wind / Low Solar
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