How do wind turbines work?

Humankind has been using wind power for generations. Throughout
history, from sailboats to windmills, wind has been a crucial
source of energy.

In recent times, wind energy has become more popular as an
efficient and more sustainable substitute for fossil fuels. Wind
farms have started dotting coastlines and mountaintops across the
globe.

For efficiently and judiciously producing the highest amounts of
electricity with wind energy, there’s a lot to take into
account. 

RELATED: THE SCIENTIFIC REASON WHY WIND
TURBINES HAVE 3 BLADES^[1]

How do wind turbines work?

Before we discuss the technical requirements of a wind turbine,
it is essential to know the basic principle on which these wind turbines
work^[2].

Wind turbines utilize the kinetic energy of wind to turn the
propeller-like blades, which in turn powers the motor-generator set
to produce electrical energy.

The wind flow depends on the differences in terrain, vegetation,
and water bodies. Hence, you’ll often find wind turbines placed at
higher altitudes where the wind blows steadily.

Several sizes of wind
turbines^[3] are designed depending
on the power requirements. Utility turbines are capable of
producing 100 kilowatts to several megawatts and
are often used to power the electrical grid.

Offshore wind turbines are tall and massive structures,
capturing powerful ocean winds to generate vast amounts of
electrical energy.

Smaller turbines that produce power less than 100
kilowatts are used for residential and agricultural
applications. These are often used in remote, off-grid
locations.

However, given the benefits of clean and cost-effective energy,
small turbines are now increasingly used in grid-connected
applications too.

Planning a small wind power system

If you’re planning to capture this abundant energy to power your
home, it is important to understand the basic requirements of
setting up a wind turbine.

The first and foremost requirement is to check the suitability
of your site for an electric wind power system. You need to
estimate the wind resource, as it can vary depending on the
terrain.

If you live in the U.S., you can estimate the wind source in
your area by referring to the wind resource
maps^[4] provided by the U.S.
Department of Energy’s Wind Powering
America Program^[5].

Another way is to use a direct wind resource measurement system
to get a clear picture of the available resource.

Source: Chris Light/Wikimedia
Commons^[6]

How big of a wind turbine do you need to power a house?

The size of the wind turbine you require depends upon your
application. An energy budget for residential applications should
be made, and whether monetary incentives are available.

This data will help decide the turbine size you will require. As
energy efficiency is typically more affordable than energy
production, making your abode more energy proficient will probably
be more financially savvy and will decrease the size of the wind
turbine you need.

Wind turbine makers, sellers, and installers can help appraise
your framework depending on your power necessities and the
particulars of your nearby wind resource and micro-siting^[7].

Depending on the power^[8] you need to create,
turbines required for residential usage range from 400
Watts to 100 kW (100 kW for very large loads). Small
turbines are in the range of 20 Watts to 100 kilowatts
(kW).

Every year, a typical residence consumes about 911
kWh every 30 days, which sums up to around 10,972
kilowatt-hours (kWh) of power^[9]. A wind turbine in the
range of 5 to 15 kW, in view of the normal wind
speed in the region, would be required to make significantly extra
to this demand.

For a home requiring 300 kWh every month, a
1.5-kW wind turbine can suffice yearly in a region
with a 14 MPH (6.26 meters every second) average
wind speed. The expected annual energy^[10] output of the turbine
as a function of annual average wind speed can be provided by the
manufacturer, dealer, or installer.

The producer will likewise give data about any maximum wind
speeds at which the turbine is planned to work.

To prevent the rotor from turning unstable in very high winds,
most turbines have customized overspeed-directing structures.
Insights that will enable you to pick which size turbine will best
meet your capacity, will be based on the data about your local wind
resource, which incorporates wind speed, heading, and your energy
spending plan.

How much does a wind turbine cost for your home?

Wind turbine expenditure proportion changes significantly
between producers and installers in contrast to other sustainable
power sources for private or business use.

Here are the commonly available types of wind turbines you can
choose from:

Roof-mounted wind turbines

A roof-mounted turbine might well take the edge of expanding
fuel charges throughout the following years. However, it won’t give
all the power you require.

Source: Andol/Wikimedia
Commons^[11]

You may consider introducing a rooftop mounted wind turbine, on
the off chance that you have a high rooftop that gets enough wind
speed most of the time. These can be utilized to enhance your power
supply and differ in power from about 0.5 kW to 2.5
kW.

The ordinary cost of a rooftop mounted wind turbine is around
$3,000, which ought to be kept up and could cost you as much as
several hundred dollars consistently.

Free-standing wind turbines

Free-standing wind turbines can be an effective option for those
who are genuinely considering utilizing wind as a method of giving
renewable energy for a local power source. But, they are likewise
increasingly expensive to install.

Cost depends upon the size and the yield that is needed.
Depending upon your zone and wind speeds, a 1.5 kW
turbine would generally cost $8,000 and
$12,000^[12] and give out around
2,600 kW over a year.

A greater exhibit that has a 15 kW limit would
cost in the area of $100,000 and return around 36,000
kW over a year.

You will also need to consider the maintenance cost and if you
required to arrange authorization for all wind turbine
structures.

Source: TechnoSpin
Inc./Flickr^[13]

A lot of significant parts may need supplanting, for instance,
batteries or the inverter that change DC current to AC. However,
taking everything into account, a wind turbine is made to last more
than 20-25 years.

What’s the best wind turbine for a home?

Producing your electricity is an efficient way of bringing down
your electric bills. While solar energy is usually the go-to
eco-friendly option, wind power can also be another alternative for
those residing in areas with reliable wind speeds.

Whether you are residing in a rural area and the electric grid
is non-accessible or are living in a suburb and wishing to cut-down
your utility bill, home wind turbines are a one-stop solution. You
just have to have little knowledge, some land, and a high voltage
battery bank.

You can get a mid-range home wind turbine for approximately
$700^[14], which will
conveniently meet your needs. A bigger one, with a capacity of over
1500W^[15] and
2000W^[16], will cost you
around $1,500 and $2,000, respectively.