How Does Wind Power Work?

Wind energy is an environmentally inert, clean, and inexhaustible source of electric power that, as it turns out, is really just another form of solar energy. The sun creates wind by its uneven heating of the planet’s atmosphere. It’s moderated by the earth’s rotation and irregularities in its surface. The planet’s terrain, water bodies, and vegetation then affect the wind flow patterns. With the invention of wind turbines, we can now harness the wind’s energy and use it instead of purchasing electricity from the utility companies that are derived from non-renewable sources.

The easiest way to understand how wind turbines work is to think of a fan operating in reverse – rather than electricity spinning the blades and thus generating wind, the wind spins the blades, thereby generating electricity.

Breaking it down to it’s simplest components, a wind turbine operates as follows:
-the wind turns
-the bladesthe blades spin a shaft
-the shaft connects to a generator
-the generator produces electricity.

To expand on that simplification, the turbine’s blades are connected to a hub that’s mounted atop a turning shaft which runs into a gear transmission box that increases the turning speed which, in turn, is connected to a high speed shaft that cranks the generator. If the wind speeds get too high, a brake is deployed to slow the blades down and prevent damage being done to the system.


There are two basic types of wind turbine:horizontal axis wind turbines: the kind most commonly in use today and the focus of U.S.Department of Energy research on wind power, these come in two varieties:
- 2-blade horizontal axis turbines spin downwind
- 3-blade horizontal axis turbines spin upwind vertical axis wind turbines

The size of a wind turbine will influence its power generating capacity, with the smaller windmills that produce under 50 kilowatts being the type most commonly used to power water pumps, telecom dishes, and homes.

In an innovative advancement known as hybrid wind systems, these smaller turbines are also being used in combination with solar (photovoltaic) systems, rechargeable deep-cycle batteries, and diesel generators to provide storable, on-demand power in more remote, off-the-grid places.

In most residential situations, a wind turbine is used as a supplemental source of power in combination with local, on-the-grid, utility power. There is something called a cut-in speed (7-10 miles per hour), below which the wind turbine will cease to provide an output, and the utility grid provides the structure’s power. Above the cut-in speed, the wind turbine kicks in and the grid power supply is proportionately reduced (depending on the structure’s energy draw at the given moment).

If the output produced by the wind turbine exceeds the draw from the structure (and/or storage devices, like batteries), the excess power is then sold back to the pubic utility company. Use of wind energy can reduce a residence’s energy costs by, on average, 50-90%, though these numbers are influenced by a variety of factors and, as such, can fluctuate greatly.

In a typical residence that uses under 10,000 kilowatt hours per year of electric power, a 5-15 kilowatt wind turbine should more than suffice. This type of system can run anywhere from $6,000-$22,000 to install, depending on a variety of factors, including: its size, your intended application, and any service contracts entered into with the manufacturer.

Being that certain situations (such as in the city) make personal wind power use an unviable option, a general rule of thumb is to consider installing your own wind power system if and only if you pay at least 10 cents per kilowatt hour and your location’s average wind speeds exceed 10 miles per hour.

The larger wind turbines have capacities upwards of 50 kilowatts, running these days into the several-megawatt range. These windmills, known as utility scale turbines, can be grouped together and connected to central lines for transmitting and distributing in bulk to the local utility grids that, in turn, sell that power to homes and businesses across the land. These are called wind power plants or wind farms.

Home Solar Power System An Effective Source of Alternative Energy

Home solar power systems offer a great way to use an alternative energy source. They provide clean, renewable energy with very little maintenance needed after the initial installation. With a home solar power system, you can significantly lower your utility bill or even receive a credit. Depending on the area you live in, you may even be eligible for a rebate from 20 to even 75% of the cost of a home solar power system.

A home solar power system typically consists of a few photovoltaic panels mounted on your home's rooftop. These panels need to be mounted on an area of the rooftop that receives a lot of direct sunlight throughout the day. The southern facing area is usually preferred spot for the panels and your solar power system dealer should include installation in the package you buy. The photovoltaic panels take in sunlight and convert it into DC power. The power then goes through an inverter to convert it to AC power for use in your home. Extra power is stored in batteries for later use such as night time and cloudy days.

There are many different reasons to use a home solar power system. If you build a house in a remote area, solar power might be your only option until a utility grid reaches it. You might want to have an emergency power supply if you live in an area that is prone to power outages or brownouts. Many people like the fact that they are contributing to a healthier environment with their pollution free solar power.

There are many subsidies and rebates available to you if you decide to use a home solar power system. California will give you a 40% rebate on your total installation purchase and many other states offer a similar incentive program. You also receive credit to your utility account if you generate more power than you use throughout the day. This is called net metering and most utility providers offer this program for home solar power system users. If they don't, they will send you a rebate check once a month for your extra generated power.

When choosing your home solar power system, you will want to check around with various dealers to see what types of panels are available to you. Some panels generate more power than others so you want to make sure you are getting the best deal available. Many solar dealers will offer you great package deals with panels, inverters, and batteries with a very comprehensive maintenance plan. You will usually be able to trade in your old batteries for a discount on new ones when the need arises.

Learn How To Make Solar Power Work For You

There has never been a better time than now to take advantage of the numerous benefits of solar power. Many states have made solar power affordable, cost effective, providing a 10% return on investment and in many cases solar power will pay for itself almost instantly.
The utilization of solar power has never offered more benefits than now. Not only can the installation of solar power pay for itself almost instantly, but given the current world political climate and the threat of terrorist actions to disrupt cheap oil supplies make it very prudent.
Many states offer a 10% return on investments to encourage its use. The simple fact is that installing a solar electric system in your home is now cost effective for the first time. And you'll sleep better at night knowing that you have now become part of the energy solution as world oil supplies continue to dwindle.

In the state of California the cost of solar power in 1978 was well over $300 per watt. Today, with incentives offered by the state, that price has now dropped to less than $6 per watt- a staggering 98% reduction in cost of solar energy.
In addition to the reduction in cost of installing a solar power system, your home's value increases $20 for every $1 reduction in annual utility bills- this according to the National Appraisal Institute. Therefore, installing a solar power system in your home costing $16,000 would increase you home's value by $17,520. That's a net gain of $1520 the day you install the system.

On April 25, 1950 Bell Laboratories introduced the first silicon solar cell. Bell called its invention "The first successful device (solar cell) to convert useful amounts of the sun's energy directly into electricity." The NY Times heralded it as "The beginning of a New Era, leading eventually to the realization of one of mankind's most cherished dreams-The harnessing of the almost limitless energy of the sun for uses of civilization."
99% of the world's energy comes from sunlight or solar energy. Everyday enough free sunlight energy falls on the Earth to supply our energy needs for 4-5 years at our present rate of consumption. At the equator, the Sun provides 1000 Watts per square meter on the Earth's surface.

The amount of solar energy we take today in no way diminishes the amount we can take tomorrow or any time in the future.

Learn about the numerous benefits of utilizing clean, renewable Solar Energy at http://www.solarenergyassociation.com/ You will sleep better at night knowing that you are part of the solution - not part of the problem.

How Does Solar Power Work?

The basics of solar power.

Solar power is probably the cleanest, most viable form of renewable energy available and it can be used in several forms to help power your house. Many gardens now use solar lights or solar garden water features. The availability and wide use of solar power in gardens shows exactly how versatile it is as a source of energy. The technology and the systems are becoming smaller, more compact and better looking than when they were first created and used. Early examples of solar power systems can be seen in California where, in the 1980s, enough solar power panels

were installed to power over 10 million homes.

How do photovoltaic tiles work?

Simply put photovoltaic tiles and other forms of solar energy work by converting some of the energy in sunlight into a clean form of electricity that can be used in our houses. The PV cells consist of a positive and a negative slice of silicon placed under a thin slice of glass. As the protons of the sunlight beat down onto the PV cell they knock the neutrons off the silicon. The negatively charged free neutrons are attracted to the silicon but are trapped by the magnetic field that is formed from the opposing fields. Small wires on the silicon catch these neutrons and when connected in a circuit an electric current is formed.
This reaction gives Direct Current electricity though, and it must be passed through an inverter to be converted into an Alternating Current used in our homes to power any electrical items. Some of the power is lost in this part of the process as the inverter is only around 95% efficient but this is a much greater efficiency than was once available.
The nature of the PV cell means there is little or no maintenance required and there are no moving parts; this means that a typical PV cell can last up to 40 years with no work besides an annual clean.

How can I use them to power my house?

There are several ways to use solar power around the house and not just for powering. You can use it to heat your hot water, heat your pool or even your central heating or if you have plenty of roof space and a reasonable amount of sun you can get a grid tie system; a grid tie system means that not only can you power your entire house but during those times when you create an excess of electricity you can sell it back to the grid. An efficiently solar powered home will be able to reasonably create between 75 and 100% of their own power and because of the grid tie system this means you may not have to pay for electricity ever again.

For more more information about solar power please visit http://www.solar-power-energy.info

Solar Energy Advantages Disadvantages

Many of us know that solar energy is a good thing, but few really understand why. Therefore, I compiled a comprehensive list of solar energy advantages and disadvantages that will enable you to make an educated decision whether on not Solar Power is right for YOU.

Solar Energy Advantages

1. Saves you money

-After the initial investment has been recovered, the energy from the sun is practically FREE.

-The recovery/ payback period for this investment can be very short depending on how much electricity your household uses.

-Financial incentives are available form the government that will reduce your cost.

-If your system produce more energy than you use, your utility company can buy it from you, building up a credit on your account! This is called net metering.

-It will save you money on your electricity bill if you have one at all.

-Solar energy does not require any fuel.

-It's not affected by the supply and demand of fuel and is therefore not subjected to the ever-increasing price of gasoline.

-The savings are immediate and for many years to come.

-The use of solar energy indirectly reduces health costs.

2. Environmentally friendly

-Solar Energy is clean, renewable (unlike gas, oil and coal) and sustainable, helping to protect our environment.

-It does not pollute our air by releasing carbon dioxide, nitrogen oxide, sulphur dioxide or mercury into the atmosphere like many traditional forms of electrical generations does.

-Therefore Solar Energy does not contribute to global warming, acid rain or smog.

-It actively contributes to the decrease of harmful green house gas emissions.

-It's generated where it is needed.

-By not using any fuel, Solar Energy does not contribute to the cost and problems of the recovery and transportation of fuel or the storage of radioactive waste.

3. Independent/ semi-independent

-Solar Energy can be utilized to offset utility-supplied energy consumption. It does not only reduce your electricity bill, but will also continue to supply your home/ business with electricity in the event of a power outage.

-A Solar Energy system can operate entirely independent, not requiring a connection to a power or gas grid at all. Systems can therefore be installed in remote locations (like holiday log cabins), making it more practical and cost-effective than the supply of utility electricity to a new site.

-The use of Solar Energy reduces our dependence on foreign and/or centralized sources of energy, influenced by natural disasters or international events and so contributes to a sustainable future.

-Solar Energy supports local job and wealth creation, fuelling local economies.

4. Low/ no maintenance

-Solar Energy systems are virtually maintenance free and will last for decades.

-Once installed, there are no recurring costs.

-They operate silently, have no moving parts, do not release offensive smells and do not require you to add any fuel.

-More solar panels can easily be added in the future when your family's needs grow.

Solar Energy Disadvantages

-The initial cost is the main disadvantage of installing a solar energy system, largely because of the high cost of the semi-conducting materials used in building one.

-The cost of solar energy is also high compared to non-renewable utility-supplied electricity. As energy shortages are becoming more common, solar energy is becoming more price-competitive.

-Solar panels require quite a large area for installation to achieve a good level of efficiency.
The efficiency of the system also relies on the location of the sun, although this problem can be overcome with the installation of certain components.

-The production of solar energy is influenced by the presence of clouds or pollution in the air.

-Similarly, no solar energy will be produced during nighttime although a battery backup system and/or net metering will solve this problem. See www.dsireusa.org for details on how net metering allows you to save electricity and money.

-As far as solar powered cars go - their slower speed might not appeal to everyone caught up in today's rat race.

Facts About Solar Energy

You have likely been told many times different facts about solar energy. Of course, it is hard to know which facts about solar energy are actually “facts” and which are more like opinions.
This article is going to relay to you some of the top facts about solar energy. It will delve into not just positive facts about solar energy, but negative ones, as well. Are you ready? Here we go:
Facts about solar energy (in no particular order):
· Solar energy is a renewable resource (it may go away at night, but we will always have it.)
· Solar energy will not pollute our air with carbon dioxide and other harmful greenhouse gases and bad emissions.
· Solar energy can be used to heat water, dry clothes, heat swimming pools, power attic fans, power small appliances, produce light for both indoors and outdoors, and even to power cars, among other things.
· In 1990, a aircraft powered solely by the sun crossed the United States.
· Solar energy products can be very expensive. The initial cost is, perhaps, the main disadvantage of solar energy.
· You need a relatively large area to install solar panels if you want a good level of efficiency.
· Depending where you live (Arizona vs. Alaska, around many shady trees or in the desert, etc.), you will get different results with solar energy systems.
· Of course, once you install the products, they can be very inexpensive to run. In fact, energy from the sun is free.
· If you have a really good solar energy system, one that produces even more energy than you use, your utility company can buy it from you.
· When you use solar energy, you are making you and your home independent. You do not need to depend on foreign or other sources of energy which can raise their costs quickly.
· To run a solar energy system, you do not even need to connect to a gas or power grid.
· Solar energy cannot be produced at night or if there is a lot of pollution in the air or clouds over the sun.
· Of course, realize that you can have a battery backup system with your solar energy system that will take care of the problems that could arise when the sun does not rise, so to speak.
· You can install solar energy in remote locations.
· If there is a power outage, you can still have electricity!
· As your energy needs grow, you can add more solar panels
· Solar panels operate silently.
· Solar powered cars are not yet up to par with other cars. They have a much slower speed.
· Solar energy systems require very little maintenance and will last for a long time.
· Technology for solar energy is constantly improving.
Those are just a few facts about solar energy. I hope that they were helpful!

Solar Energy - The Alternative Source of Energy

The fact is that the cost of energy keeps rising, and alone is forcing people to look the other direction for cheaper alternatives to energy. Solar energy has been one of the alternatives that people have found to have cheaper energy. Solar energy offers one more than one advantage, but it also has its limitations.

Solar energy is controlling the sun to create energy. The sun is a renewable source of energy. It is available to everybody around the world, and through research people have found a way to capture the energy of the sun and put it to use.

To use solar energy, one has to find a way to capture energy. This is where solar panels come in. Solar panels collect the energy of the sun. That energy that is collected may be converted to power or it may be stored and used later.

If you are collecting the sun's energy, it is important that you have a storage unit. The reason being is that the sun is not around on rainy days to produce energy for those that require and depend on it. At night and also on cloudy days, the sun and also its power are not always available. In order to have an effective and efficient energy unit it is important that there is a way that the energy that it collects is stored and not used immediately, but may be used later.

There will definitely be times that you will require a backup source. One needs to have constant energy supplied by the sun if they are dependent on it. Again, it is important to have an energy unit that is able to collect and store energy. This will require when the sun is available but is not strong enough to produce the required amount of energy that is needed by those that depend on it.

A known reason why people use solar energy is to provide heat. The transformation that involves heating is little energy, and this means it is a perfect way to use solar energy. A common use for the energy is for cooling. However, using solar energy for this can be expensive. This method involves phases and changes that consumes the energy and then cools it down.

Another reason people are using solar energy is that it can be converted into electricity. There are many countries that suffer from blackouts, and instead of using a generator they have turned to solar energy. Solar energy can power any electrical device just like electricity.

Photovoltaic cells converts solar energy to electricity. Photovoltaic cells are able to generate 32.3% electricity, and this generation rate is better than the generation of ordinary electricity. The thing is that the technology that is available to allow the generation rate of an average photovoltaic cell is 15%, and this makes its efficiency quite low compared to the way electricity is generated normally.

Technology will improve and the use of solar energy and being used for electricity will be a real idea. Solar energy will soon be playing a major part in the generation of electricity.