Wind power systems for homeEnergy
All you need to know to get your home wind energy project started
Wind is a great source of renewable energy power. Wind is the fastest growing source of alternative energy worldwide because it has a proven and reliable technology.
What Is Wind Energy?
Wind power is an environmentally friendly, green energy source. Wind occurs naturally on earth as a result of the Earth’s tilt, spin, the heating from the sun and varying temperatures on the earth’s surface. This all causes air to move around the planet.
Wind energy does not contribute to air or water pollution, nor does it leak fossil fuel oils. Care must be taken when planning large wind utility plants to be sensitive to migrating birds and mammals. For home use, this is not an issue.
History of Wind Energy
Harnessing the wind for power is a very old technique that was first used in ancient civilizations and became popular in Europe during the Middle Ages. These early windmills had sails instead of blades.
Modern wind turbines are structured similarly to the traditional windmill but that’s as far as the resemblance goes. Turbines are the part of the wind machine that turns. They are sleek and aerodynamic in order to better catch the wind and convert it into electricity.
Today’s Wind Energy – Better and More Powerful
Wind Power depends on the amount of air (volume), speed the air travels (velocity) and the mass of air (density). These things must work together to provide the amount of push the turbine needs to turn. Wind turbines average 35% – 45 % efficiency.
Wind turbines are most often measured in kilowatts or kW. For example, a standard 100-watt light bulb uses one kWh after ten hours of use. Wind industry experts say that 10 kW system will generate about 10,000 kWh per year, which is what the average American home uses.
Determining your electrical needs and usage is important. If you are going to live “off-grid” and not be attached to conventional electricity then you need to work on reducing your level of energy consumption. You can do this by purchasing energy star appliances. Just switching to Energy Star LED
Today’s turbines are equipped with typically three blades and a nacelle which houses the motor and gearbox. They are typically on a horizontal axis in relationship to the single steel pole which holds them up.
The height of the pole is important in how much wind energy the unit can process. Larger kilowatt (kW) systems require heavy steel poles of around 250 feet. Smaller systems can use a shorter pole and microsystems are meant to be mounted on cabins or RV’s.
The blades on the turbine are an important consideration. Many are fiber-reinforced plastics but metal ones are also available. How they are mounted and fixed is important to their efficiency. They come fixed pitch, either twisted/tapered, or straight.
All wind energy units contain a generator to change the kinetic energy from the wind to mechanical energy which can be used for electricity. The generators are designed to be simple and reliable with few moving parts so that little regular maintenance required.
Where Does Wind Energy Work Best
Wind turbines are becoming more efficient and working at lower speeds. Smaller units designed for single applications are very cost effective. Larger systems that are meant to power a home need more wind speed.
Not everywhere is suitable for wind power. Wind turbines need a consistent wind speed of 6 – 9 miles per hour. To evaluate your area in the United States
The best states for utilizing wind energy according to the American Wind Energy Association are:
- North Dakota
- South Dakota
- Areas along the northeast coast
You can measure your wind speed with the use of an anemometer. The HOLDPEAK 866B Digital Anemometer measures wind speed, temperature and wind chill. It has a range: 0.3-30m/s and accuracy: 0.1dgts. Take measurements on a daily schedule for several weeks to determine your average wind speed.
Types of Wind Power Systems
There are numerous types of wind power systems which vary depending on the
Upwind turbines have the wind facing the turbine. Are more efficient but harder to maintain. Needs to have a rigid hub which is away from the tower.
Small vertical axes turbines are attractive and made to fit on RV’s or boats. This one made by Wonderful Online has a 400Watt DC12V generator and four with optimized aerodynamic blades. The blades are made for low wind
Small turbines can have a downwind turbine which means the wind hits them from the back. These are most often seen on smaller turbines. They can be more flexible in the rotor and the generator but
Small systems are great for home and farm applications. A small wind energy system can provide you with a practical and economical source of electricity. When considering a wind power system think about the amount of space you have and where you will put your turbine. If you are in a subdivision or more urban area you need to make sure that your local zoning codes or covenants allow wind turbines.
Mini turbines are designed for charging batteries or running lights in an RV or cabin. They run between 20 – 50 kW.
If you are handy and want to DIY and make the blades you can just buy the generator to power your system. The MarsRock 600r/m 100W 12V or 24V Permanent Magnet Generator AC Alternator for Vertical or Horizontal Wind Turbine 100W Wind Generator (12V). This small generator has impressive power and is gearless, uses direct -drive, and has a low rev rare earth Permanent Magnet Generator which is easy and safe for operating and maintenance.
Costs, Installation, and Return on Investment
Wind energy is growing in popularity worldwide. And no doubt because the costs of running a wind power system have come down considerably. The average cost of industrial wind power is 8.2 cents per kilowatt, compared to coal-burning plants at 11 cents per kilowatt. Residential costs and system have also come down making it a desirable option for new construction.
Grid-Tied Or Off Grid
One of your first considerations will be to decide if you want to be grid tied or off the grid.
Grid-Tied means that you are still connected to your local electric power company. Your wind energy system would supplement your power needs. So your home would use available electricity from your wind turbine first. If your turbine was not producing electric at the moment, say it was a balmy day or you had all your appliances running, then your conventional electric would kick in and give you power.
Depending on your location and your power company, you can sometimes earn money from your grid-tied system. This would happen if your wind turbine produced more electricity then what your house used. Then your electric company would buy back the excess electric and give you a credit or a check. It is worthwhile to contact your electric company and find out their policies on grid-tied systems.
Off-grid means that you are totally independent of your conventional electric company. This means you produce all of your own electricity needs. People chose this option for many reasons. They may desire to be independent and not rely on the electric company or government. Or their home may be in a remote area that is not served by power lines or too expensive to have them run. One advantage of being off grid is no monthly bill!
Average Costs of Residential Wind Systems
Wind systems can reduce your electric bill by 50 – 90 %, especially if your average electricity bills are $150 per month or more.
If your property is in a remote location without easy access to utility lines wind may be a viable option. Wind energy is an investment so you do need to be comfortable with long-term investments. Remember that if you are off grid and you invest in wind energy you will have no monthly bill. Once your system is paid for you get your electric for free.
Check out the Wind Exchange website for information on your area.
Modern turbines are increasing in efficiency but are still less than 60%. 59% is the best that a larger conventional wind power unit can accomplish and the smaller turbines run 30 – 40%. While this may seem low the overall cost savings often make wind worthwhile.
Figuring Out The Costs
If you know a unit’s capacity and efficiency factors, you can figure out the estimated annual output. Use this formula by multiplying year x day x capacity x-factors to get kW per year.
So if the manufacturer states that the turbine has a rated capacity of 1500 kilowatts with an efficiency factor of 25% then you would set that up like
365 x 24 x 1500 x .25 = 3,285, 000 kilowatt hours per year
Remember this is the ideal. In real life, you have less or more wind on any given day.
You can use the NREL wind maps to adjust your time figures for a more accurate location-specific figure.
What Size Wind System Do I Need
The size of your wind system depends on what you want to do with it. Do you want to supplement your power needs and reduce your electric bill or do you want to have the wind provide all your electrical needs?
Small turbines range in size from 20 watts to 100 kilowatts (kW). The smaller or “micro” (20- to 500-watt) turbines are used in a variety of applications such as charging batteries for recreational vehicles and sailboats.
Small turbines that produce 3 – 10
Return On Investment
Your return on investment (ROI) basically is the wind turbine cost-effective value. Will you get your monies worth out of it. Keep in mind that the federal government and many states offer tax rebates for installing renewable energy in your home.
Small Turbines are those up to 10 kW are often installed in “rural residential” on-grid and off-grid applications. The average investment is $2,500-$8,000/kW for purchase and installation. Small systems are designed for reliability and low maintenance so that you do not have to have a lot of mechanical experience.
Small systems normally require an average wind speed of nine miles per hour and have an ROI value of approximately $0.06 – $0.26 per kWh.
Installation of a wind energy system is the most detailed and expensive aspect. Picking a location for the tower and deciding how to run the electrical cables to your home is critical to the success of your project.
The first thing to consider when installing a wind system is where to locate the tower. The taller towers need to be “planted” quite deep and cemented into the ground. Guy wires are then attached to provided stability to the steel pole.
This can be a DIY project or you can hire an installer.
In most areas, you will be required to state or city zoning laws to hire a licensed electrician to connect the power lines to your home.
Wind Energy System Kits
Purchasing a kit can be a very economical and easy way to get into wind energy. The nice thing about kits is that you have all the components of the turbine and generator for easy to put together installation. Pole mounted kits often require you to have a mounted pole.
The ECO LLC 400W DC 12V/24V Wind Turbine Generator does not include the pole or battery. This is a great starter kit for people wanting to get going with wind power. It has a low wind speed startup so is great if you have lower then average wind capacity. In addition, the tower height requirement is only 15 – 30 feet high.
Not everyone has access to the perfect conditions. If your wind and or solar requirements don’t match the output guidelines you might consider a hybrid system. The ECO LLC 850W Hybrid Solar-Wind Kit gives you 400W Wind Generator. Plus you get three solar panels that are 150W and a 1KW Inverter.
This system gives you a maximum daily output at 2520W. The big advantage is that it works when there is only wind power or only solar power available or will work as a hybrid. This combines the best of both worlds.
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