Sunday, November 8, 2015

DIY sunlight energy

DIY sunlight energy


before, sun vigor or solar phone panels are best to be had in business areas and hardware outlets. at the present time, increasingly folks are attempting DIY or do it your self kits. which you can anticipate to have your own setup in just at some point, provided that you have an easy kit to begin with. sun power can also be executed correct to your very possess house, with out the support of a legitimate. be certain you comply with the educational guide carefully for the great results.



constructing Your possess sun energy Generator

you should utilize elements which are available on the internet or your nearby retailer. that you may create a tiny sunlight vigor generator with a finances of simplest $200 to $300. this is excellent for energy disasters and lifestyles external the energy grid. The setup may also with no trouble vigour the modem, tv, DC home equipment, computer, cameras and lights. you should use this in cabins, archaeological digs, tents and camping journeys. this is the superb setup for people who journey to undeveloped regions and nations.

initial Steps

first of all, you need to make or purchase your self a tiny solar panel. that you can get a device rated at 12 volts or higher for simplest $a hundred at a marine provide store or RV retailer. next, buy a battery. experts propose that you get rechargeable batteries from to be had green companies. Get any dimension of deep cycle 12 volt lead/acid or gel battery. you are going to want the deep cycle battery for nonstop use. The kind in the vehicle is a cranking battery, which is excellent for establishing engines. you can even need to look for bargains and different good deals with the intention to price best around $50 to $60.

next Steps 

Take a battery field the place you will put the generator in. The field may only rate round $10. it is ultimate for protecting the exposed terminals simply if in case you have kids throughout the residence. if you want to install the procedure in a cabin, pump shed or boat, that you may pass this step. buy a 12 volt DC meter. this will rate you around $25. buy a DC enter. The triple inlet model is advocated. that you can buy this for most effective $10 at a automobile materials store. The gadget shall be excellent for powering DC home equipment like lights, hair dryers and vacuum cleaners.

If you ought to power AC appliances, you're going to want an inverter. The inverter converts the saved DC power within the battery right into AC energy for majority of household appliances. Measure the watts that you are going to need. affordable inverters of more than a few sizes may also be purchased on-line too. Use a drill to attach the meter and DC enter to the top area of the field.

Charging


subsequent, use insulated wire to connect the meter to the wingnut terminals discovered on the battery. hyperlink the terrible pole at the start. most effective handle a single wire at a time. link the DC inlet straight to the battery in a an identical fashion. link the sunlight panel to the battery the identical approach. Shut the lid utilising a bungee cord to maintain the whole thing tight. function the sun panel under the sun. it will take 5 to eight hours to cost useless batteries. which you could power special instruments like enthusiasts, lights and radios.


How energy can benefit solar powered

Find out how energy can benefit solar powered


Roughage no doubt that the introduction of a solar powered in your home is an incredible land to help approach. On the other hand, feed must remember that this is speculation. You need to understand in the remote possibility that fits your financial arrangement. In this article we will cover the basics of monetary contemplations while going light sunlight based based.

Sun light boards based productive base can move. In the event that their boards are stable, you must choose a position that is somewhere in the middle of what is perfect for summer and making it perfect for winter.
You must have an active reinforcement should guide the sunlight negligence plateau framework based work legitimately. It is a cunning plan to stay connected to your neighborhood or trellis to put resources into a generator. Keep your generator carefully and run it regularly to keep it in perfect condition.
solar power vitality is the right choice for your home? You have to consider a standard of things. On the off chance that you have an out-of network ownership, where you may want to live, vitality based Sun is a fabulous decision. It is a fabulous choice in the remote possibility that you may pay more directly to spare the planet.

Credit Evaluation child often accessible to customers based vitality based sun light. At some points, you can get about 30 percent of the money you put into your back frame. You should do some exploration on the Internet or contact your nearest government to find out about the impetus and projects you are qualified for.
It is safe to say that you are tired of paying high heating bills or wash to monitor the boiling water? solar powered perfect child boards for areas receiving somewhere around 5 to 6 hours normal light entire direct daily. Heating through sun-controlled pool controlled water heating can reduce expenses.
In case your house is undergoing redevelopment, this is the perfect time to investigate the sunlight for their strength at home. Sun oriented force is the method of what is to come. In case this is not something that has contemplated the use, without ban, you should consider today.

Based strength sunlight may be an approach to living "under" no ban is not necessary to be outside the network to use a framework-based flammable sun. You can be free of Organizations of force in their general vicinity. That means no roughage force bills to pay and no costly administration calls.

Regarding water heaters powered sun light based, be practical. While even more effective variants create efficiencies above 33% of electrical remain beneficial. Solar Power Energy Also, do not make the mistake of feeling that you shower in the morning will be cold. Sunlight based water radiators remain hot or warm for about one day.
Check your board powered sun a standard of times a year to decide their productivity. This registration correction boards incorporating appropriate reviews its edges, ensuring that every child strong partnerships and ensuring that the investor force is working legitimately.

On the off chance that you dwell in the southwestern US, the force based on sunlight is needed. This territory receives more sun oriented vitality throughout the year, so it's incredibly helpful to end tax depends on the sun for the needs of its vitality. On the off chance that you have not had the opportunity to investigate the costs, set aside some the opportunity to do as such.

Turn your tables as the change of seasons. As the seasons change, the level of light reaching the house will change, like its course. When you do well to shape their boards properly, it can benefit the possible leader of accessible normal light.

Benefit Solar Power


Try not to think that you can bear the cost of acquiring the sun-based panels? Leasing a part of the sun's power propulsion instead of purchase. Renewable Energy rent of considerably less than buying your frame expenses, and you will quickly recognize the reserve funds, due to lower implementation costs.

Bets buying tables of an organization, its budget Comments Research Foundation. You need insurance that will be around for the length of your home that appears to be make. This bodes regarding your warranty, in order that you can get the essential pieces in the future.

Sun-based boards do more than simply give vitality to control your lights. They also offer warmth of the water. Sun oriented boards can have a critical effect on your overall vitality bill. You could even end up with the organization strength you pay!

Find the most suitable methods to use a sun-driven framework vitality inside your home. Case in point, many frames can simply give vitality segments keep a radiator framework in place. Anyway Ocean, can provide enough vitality to give the chairman of the vitality to your water heater. Survey your needs carefully and think about various stakes items to choose what type of frame you need to put resources.

Following perusing these tips, you should know if you should put resources based on sunlight plates. It may sound great, no ban, you may have to take a stab at something else if your household does not receive a decent measure of daylight. Take after Suge

Learn Everything You Need To Know About Solar Energy


Learn Everything You Need To Know About Solar Energy

Sparing the earth while diminishing the sum you spend on vitality are both essential. Over the long haul, power expenses will rise, which means you ought to investigate sun oriented vitality. This article will let you know more about sun based force.

When you look after it, your sunlight based force set-up will last. Assess and clean your boards all the time. Dealing with your sunlight based vitality framework yourself can spare you some cash; be that as it may, it might be well beneficial to set up a support plan with your installer.

It is critical when introducing your boards to recollect that the position of the sun in the sky changes with the seasons, not only just through the span of the day. By modifying the points, you will have the capacity to expand the vitality level that your board produces.

Search for a transferable lease if you rent sun oriented force. On the off chance that you can't and you wind up offering your home, you may need to pay for s framework you can't utilize. Having the choice to exchange the lease will give the new mortgage holders a helpful framework, and uproot your commitment to pay for it.

Try not to let a pushy salesman settle on your choices for you, particularly where sun oriented vitality updates are concerned. You have to ensure you set aside an ideal opportunity to assemble data on the greater part of your sun powered alternatives and settle on the right decision for you. Purchasing instantly from any high weight businessperson may bring about settling on the wrong choice and squandering your cash.

Scan for gifts and discounts to help with sun oriented board costs. It can be costly to introduce a decent framework, so take offer on the off chance that you some assistance with canning discover it. Additionally, verify whether you can get awards for renewable vitality utilization. The expense investment funds can be considerable. You may have the capacity to utilize it as a duty reasoning.

A few governments will give an expense kudos for utilizing sun based vitality. You may get an offer as high as 30% of the framework's expense. Contact a neighborhood delegate or look on the Internet for more data to see what projects are close you.

After your sun powered boards are introduced, check the inverter all the time. You need to locate a green light that is not blazing. Unpredictable flickering or no light may flag a glitch. You likely can't analyze this issue alone. A visit from a professional ought to be free in the event that you purchased boards with a 25-year guarantee, which is normal.

When you need to be green, sunlight based force is for you. The sun is a renewable asset, so you are not falling apart nature. Along these lines, you can have any kind of effect by executing sun oriented vitality power.

You ought to just put resources into an aggregate sun powered vitality framework in the event that you have effectively paid off your home. On the off chance that you are at present making installments, you are simply including an extra month to month cost which could place you in a bad position.

Figure out what government laws are set up about sunlight based force. You may need to get a few licenses before introducing some sunlight based boards on your property. In the event that you don't have a grant and introduce a unit, it is liable to evacuation.

Check the climate before purchasing sun oriented boards. Great boards can give enough power on the off chance that they can assimilate around five hours or a greater amount of daylight every day. For instance, sun oriented vitality may not be your most logical option in the event that you experience a zone where most days are blanketed, for the most part shady or foggy.

When you are considering adding sunlight based vitality to your home, consider the amount of shade your home gets. On the off chance that your home is constantly secured by shade, sun based boards most likely aren't to your greatest advantage. While it may appear to be basic, sun oriented boards do really require daylight to work, and shade pieces out the essential beams.

Continuously look at the notoriety of any organization before contracting them to introduce and keep up your sun oriented boards. You're going to need to go into a business association with an organization why should going be around later. You need this for the purpose of guarantee scope with the goal that you know you can get substitution boards if necessary.

Search out incredible approaches to use sun oriented vitality at home. Case in point, recollect that the lion's share of galaxies are just ready to in part work a warming framework. All things considered, they can give enough vitality to control your water warmer. Figuring out how to best use sun based vitality can offer you some assistance with choosing proper sun powered administrations.

Keep in mind, sun based influence can truly offer you some assistance with earning some cash. In the event that you buy sun oriented boards for your home or business, your speculation will rapidly be paid back, and after that, you will gain cash. A special reward is that you can offer back any unused power to your service organization.

Adjusting to another vitality source may be at first troublesome, however for sun powered vitality, it's justified, despite all the trouble. With any luckiness, this article can offer you some assistance with seeing the different reasons sun oriented force can enhance your life. Utilize these tips, and start a greener life.

Thursday, November 5, 2015

China Racing Ahead of U.S. in the Drive to Go Solar

WUXI, China — President Obama wants to make the United States “the world’s leading exporter of renewable energy,” but in his seven months in office, it is China that has stepped on the gas in an effort to become the dominant player in green energy — especially in solar power, and even in the United States.

Chinese companies have already played a leading role in pushing down the price of solar panels by almost half over the last year. Shi Zhengrong, the chief executive and founder of China’s biggest solar panel manufacturer, Suntech Power Holdings, said in an interview here that Suntech, to build market share, is selling solar panels on the American market for less than the cost of the materials, assembly and shipping.


graphic China’s Solar ShareFEB. 16, 2015
Shi Zhengrong of Suntech, which makes solar panels, said he had misunderstood a question concerning pricing of the panels.Chinese Solar Firm Revises Price StatementAUG. 26, 2009
Times Topic: Solar Energy
Backed by lavish government support, the Chinese are preparing to build plants to assemble their products in the United States to bypass protectionist legislation. As Japanese automakers did decades ago, Chinese solar companies are encouraging their United States executives to join industry trade groups to tamp down anti-Chinese sentiment before it takes root.



The Obama administration is determined to help the American industry. The energy and Treasury departments announced this month that they would give $2.3 billion in tax credits to clean energy equipment manufacturers. But even in the solar industry, many worry that Western companies may have fragile prospects when competing with Chinese companies that have cheap loans, electricity and labor, paying recent college graduates in engineering $7,000 a year.

“I don’t see Europe or the United States becoming major producers of solar products — they’ll be consumers,” said Thomas M. Zarrella, the chief executive of GT Solar International, a company in Merrimack, N.H., that sells specialized factory equipment to solar panel makers around the world.

Since March, Chinese governments at the national, provincial and even local level have been competing with one another to offer solar companies ever more generous subsidies, including free land, and cash for research and development. State-owned banks are flooding the industry with loans at considerably lower interest rates than available in Europe or the United States.


Continue reading the main story
Suntech, based here in Wuxi, is on track this year to pass Q-Cells of Germany, to become the world’s second-largest supplier of photovoltaic cells, which would put it behind only First Solar in Tempe, Ariz.

Hot on Suntech’s heels is a growing list of Chinese corporations backed by entrepreneurs, local governments and even the Chinese military, all seeking to capitalize on an industry deemed crucial by China’s top leadership.

Dr. Shi pointed out that other governments, including in the United States, also assist clean energy industries, including with factory construction incentives.

China’s commitment to solar energy is unlikely to make a difference soon to global warming. China’s energy consumption is growing faster than any other country’s, though the United States consumes more today. Beijing’s aim is to generate 20,000 megawatts of solar energy by 2020 — or less than half the capacity of coal-fired power plants that are built in China each year.


Solar energy remains far more expensive to generate than energy from coal, oil, natural gas or even wind. But in addition to heavy Chinese investment and low Chinese costs, the global economic downturn and a decline in European subsidies to buy panels have lowered prices.

The American economic stimulus plan requires any project receiving money to use steel and other construction materials, including solar panels, from countries that have signed the World Trade Organization’s agreement on free trade in government procurement. China has not.

In response to this, and to reduce shipping costs, Suntech plans to announce in the next month or two that it will build a solar panel assembly plant in the United States, said Steven Chan, its president for global sales and marketing.

“It’ll be to facilitate sales — ‘buy American’ and things like that,” Mr. Chan said, adding that the factory would have 75 to 150 workers and be located in Phoenix, or somewhere in Texas.

But 90 percent of the workers at the $30 million factory will be blue-collar laborers, welding together panels from solar wafers made in China, Dr. Shi said.

Yingli Solar, another large Chinese manufacturer, said on Thursday that it also had a “preliminary plan” to assemble panels in the United States.

Western rivals, meanwhile, are struggling. Q-Cells of Germany announced last week that it would lay off 500 of its 2,600 employees because of declining sales. It and two other German companies, Conergy and SolarWorld, are particularly indignant that German subsidies were the main source of demand for solar panels until recently.

“Politicians might ask whether this is still the right way to do this, German taxpayers paying for Asian products,” said Markus Wieser, a Q-Cells spokesman.

But organizing resistance to Chinese exports could be difficult, particularly as Chinese discounting makes green energy more affordable.

Even with Suntech acknowledging that it sells below the marginal cost of producing each additional solar panel — that is, the cost after administrative and development costs are subtracted — any antidumping case, in the United States, for example, would have to show that American companies were losing money as a result.

First Solar — the solar leader, in Tempe — using a different technology from many solar panel manufacturers, is actually profitable, while the new tax credits now becoming available may help other companies.

Even organizing a united American response to Chinese exports could be difficult. Suntech has encouraged executives at its United States operations to take the top posts at the two main American industry groups, partly to make sure that these groups do not rally opposition to imports, Dr. Shi said.

The efforts of Detroit automakers to win protection from Japanese competition in the 1980s were weakened by the presence of Honda in their main trade group; they expelled Honda in 1992.

Some analysts are less pessimistic about the prospects for solar panel manufacturers in the West. Joonki Song, a partner at Photon Consulting in Boston, said that while large Chinese solar panel manufacturers are gaining market share, smaller ones have been struggling.

Mr. Zarrella of GT Solar said that Western providers of factory equipment for solar panel manufacturers would remain competitive, and Dr. Shi said that German equipment providers “have made a lot of money, tons of money.”

The Chinese government is requiring that 80 percent of the equipment for China’s first municipal power plant to use solar energy, to be built in Dunhuang in northwestern China next year, be made in China.

source:http://www.nytimes.com/2009/08/25/business/energy-environment/25solar.html?_r=0

Tuesday, November 3, 2015

Energy from moving water


Hydro-power generates electricity


Hydro-power is the largest renewable energy source for electricity generation in the United States. In 2014, hydropower accounted for about 6% of total U.S. electricity generation and 48% of generation from all renewable.
Because the source of hydroelectric power is water, hydroelectric power plants are usually located on or near a water source.

Hydro-power relies on the water cycle


Understanding the water cycle is important to understanding hydropower. There are three steps in the water cycle:
  • Solar energy heats water on the surface, causing it to evaporate.
  • Water vapor condenses into clouds and falls as precipitation (rain, snow, etc.).
  • Water flows through rivers back into the oceans, where it can evaporate and begin the cycle over again.

Mechanical energy is harnessed from moving water


The amount of available energy in moving water is determined by the volume of flow and the change in elevation (or fall) from one point to another. Swiftly flowing water in a big river, like the Columbia River that forms the border between Oregon and Washington, carries a great deal of energy in its flow. Water descending rapidly from a high point, like Niagara Falls in New York, also has substantial energy in its flow.
At both Niagara Falls and the Columbia River, water flows through a pipe, or penstock, then pushes against and turns blades in a turbine to spin a generator to produce electricity. In a run-of-the-river system, the force of the current applies the needed pressure, while in a storage system, water is accumulated in reservoirs created by dams, then released as needed to generate electricity.

History of hydropower


Hydropower is one of the oldest sources of energy. Hydropower was used thousands of years ago to turn paddle wheels to help grind grain. The nation's first industrial use of hydropower to generate electricity occurred in 1880, when 16 brush-arc lamps were powered using a water turbine at the Wolverine Chair Factory in Grand Rapids, Michigan.
The first U.S. hydroelectric power plant opened on the Fox River near Appleton, Wisconsin, on September 30, 1882.


sources:http://www.eia.gov/energyexplained/index.cfm?page=hydropower_home

Monday, November 2, 2015

Environmental Benefits of Solar Power

Dense forests, stunning mountain ranges, and sprawling plains characterize Colorado, a state known throughout the country for its scenic landscape and rugged environment. From the first pioneers who set their eyes on the Rocky Mountains to recent transplants new to the state, Colorado has always represented a vast wilderness to explore and enjoy.
If you’ve ever gazed upward from a hiking trail toward a looming snow-covered mountain peak, or stumbled across a field full of grazing deer, you understand the appeal of the state – and the need to protect those elements that many hold sacred.
Colorado’s natural beauty and environment relies on a delicate balance that is increasingly at risk of derailment due to continued use of fossil fuels, their contribution to global warming and the hazards associated with the extraction of these fuels.

Colorado and Global Warming

Burning fossil fuels gives off a number of emissions that increase the threat of global warming. In Colorado, warming temperatures could drastically change the environment in the state as we see it today. Some potential impacts include:
  • Decreased soil moisture and crop production
  • Earlier snowmelt and shorter ski season
  • Decrease in stream flow and water reserves
  • Increased threat of pine beetle outbreak
  • More frequent heat waves
  • Changes in animal wildlife and activity
Source: Environmental Protection Agency
Currently, 90% of electricity in Colorado is produced from burning fossil fuels like coal, oil, and natural gas. When burned, these fuels emit greenhouse gases, such as CO2 and methane, which not only worsen air quality, but also add to global warming’s impact on the environment.
In Colorado, this could mean lighter snow falls, increased threats of droughts, and higher risks of forest fires – damaging many of the natural features that attract residents to the state in the first place.
However, our reliance on fossil fuels for energy doesn’t need to be permanent. In fact, the Colorado solar industry is experiencing historic gains that could reduce many of the negative environmental impacts that years of fossil fuel use have caused.
In 2012 alone, more than 49,000 Colorado residents installed solar panels on their homes, generating 69.9 megawatts of power. If more people continued to switch to solar power, it could mean cleaner air, more abundant and usable water, and the protection of Colorado’s scenic environment.
Cleaner air for Colorado
All electricity-generating technologies emit pollutants and emissions during their life cycles, but solar and other renewable energy sources are unique in that they emit very little.
According to the Union of Concerned Scientists, the only emissions associated with solar technologies occur during their construction – and those levels are still quite low compared to fossil fuels. During the life cycle of a solar panel, it will only emit 0.07 pounds of CO2 per kWh, compared to coal at 2.10 pounds and natural gas at 1.12 pounds per kWh.
When higher levels of CO2 are expelled into the atmosphere, it warms temperatures, which in turn increases the effects of air pollution from fossil fuel-fired power generation, such as smog.
The Environmental Protection Agency notes that breathing in smog can adversely affect the health of people and wildlife, potentially leading to:
  • Irritated respiratory systems
  • Reduced lung function
  • Increased risk of asthma
  • Damaged cell lining in the lungs
By installing more solar panels in Colorado, many of these risks can be greatly reduced. The organizations Vote Solar and Environment Colorado estimate that if Colorado generated 1,000 megawatts of electricity through solar, the combined emissions reduction could equate to taking nearly 670,000 cars off the road by 2030 – representing 30 million tons of carbon dioxide and 766,000 pounds of nitrous oxide.
Consider that in Colorado, there are 13 coal-fired power plants that emit 47 million tons of CO2 per year, in addition to thousands of natural gas wells. Reducing our reliance on these energy sources by generating higher levels solar electricity would help protect Colorado’s air quality and reduce the effects of global warming – which in turn would strengthen the state’s most precious resource: water.
Protecting our water supplies
Outside of the state’s tourism industry and aesthetic appeal, Colorado’s annual snow fall serves a very important purpose: supplying people and wildlife with the water they need to live.
However, temperatures in Colorado are slowly rising due to fossil fuel use, affecting the levels of snowpack that the state relies on for their water supplies. Early in April 2013, for example, water content in the South Platte River Basin, the principal source of water for eastern Colorado, was 29% below normal.
Given how precious Colorado’s water supply is to the wellbeing of the state, one would imagine its protection would be of the utmost importance. However, drilling from the hydraulic fracturing, or fracking, industry uses vast amounts of water to uncover natural gas wells in the ground.

Fracking and Colorado’s Water Supply

Despite the industry’s assertion that burning natural gas is a much more positive practice compared to burning coal, fracking still has harmful effects on Colorado’s environment. Consider the following:
  • Water used annually in fracking could serve between 44,200 and 79,000 Colorado households.
  • Water used in fracking is 100% consumptive and cannot be returned to streams.
  • Fracking’s use of water equals one to two-thirds of total public supply and domestic water use.
Source: “Fracking our Future” Western Resource Advocates
Fracking projects have increased throughout Colorado rapidly as more natural gas reserves have been uncovered. Since 2010 for instance, more than 1,300 fracking wells have been permitted in Weld County, CO.
Now consider that, according to “For Farms in the West, Oil Wells are Thirsty Rivals,” published in The New York Times, a single fracking well can require five million gallons of water. For a state that’s already rated the seventh driest in the country, Colorado can’t afford to continually provide water to industries that produce dirty energy.
Fracking not only reduces the overall water supply, but could also damage the quality of it. Fracking relies on a chemical cocktail of water, acids, and detergents that are terribly harmful should they seep into drinking water.
Unlike fracking, generating solar energy doesn’t require the use of a limited, precious resource, and won’t pollute it either. If Colorado residents installed a combined 1,000 MW of solar power by 2030, it could save 6.8 billion gallons of water over the life of the panels, assuming solar displaces fracking projects.
More solar panels on Colorado roofs means not wasting water on a finite fuel like natural gas. Furthermore, offsetting greenhouse gases with solar power generation could help reduce the warmer temperatures in the state, leading to higher levels of snowpack once again.
Installing solar panels at your home or business
Increasing the number of solar panels in Colorado isn’t just a smart personal decision, but a responsible one in the face of challenges posed by global warming. Rising temperatures, worsening air quality, and a dwindling water supply can be reduced and even reversed if more Colorado residents abandoned fossil fuels and switched to solar energy.
sources;http://www.colorado-solar.org/environmental-benefits-of-solar-in-colorado.php

User's Guide to Solar Power

While many people are interested in using sustainable energy sources, the terminology can make the process of “going solar” seem more difficult than it really is.

Before contacting solar installers in your area, learn more about how solar power works, and what to look for when installing panels at your home or business.

Important terms you may come across in research

  • Direct Current (DC) – Energy captured by solar panels that can be stored.
  • Alternating Current (AC) – Electricity that flows directly from the energy source into your wall socket. DC energy is converted to AC energy through an inverter, allowing you to use it at home.
  • Inverter – A device that converts DC energy to AC energy. The AC is fed into your home from the inverter, much like it would from an electrical provider.
  • Photovoltaics – Materials that convert sunlight into electrical energy.
  • Photovoltaic Cells – Electricity producing devices consisting of silicon-based semiconductor materials
  • Photovoltaic Modules – Many photovoltaic cells assembled together, creating panels or modules
  • Photovoltaic Arrays – Many photovoltaic modules assembled together
  • Renewable Energy Certificate – A kind of currency used to show that energy you generate comes from renewable sources.
  • Solar Radiation – The general term for electromagnetic radiation emitted from the sun. This radiation can be captured and harnessed into heat and electricity with photovoltaic cells.
  • Charge Controller – A device that limits the amount of energy that is added to a battery, preventing overcharging that decreases the life of a battery.

How does a solar cell work?

You’re already set on solar, but naturally have some questions. How does all of this stuff work anyway?
Solar panels are actually made up of smaller devices known as photovoltaic cells, or solar cells. Solar cells consist of two layers of silicon sandwiched between two metal strips that conduct the flow of electricity into the house.
Silicon by itself is not a good conductor of electricity, so each layer is “doped” with two separate chemicals. The top layer of silicon receives phosphorous, while the bottom layer is doped with boron.
With the addition of the chemicals, the top layer gains more electrons, while the bottom layer receives less. Once sunlight hits the solar cell, the electrons in both layers become excited, and are “knocked loose,” flowing freely in each layer. In this state of excitement, some of the electrons hit the metal strips on the outside of the cell, generating electricity.
This electricity transfers from the metal strips to wires that eventually wind their way into a home. With dozens of cells working in conjunction as panels, homeowners generate the electricity they need to turn on lights, watch television, and use computers.
In the next section, we’ll explore how the electricity moves from panels, through several other devices, and into the home as useable energy.

How does a solar panel create energy for my home?

Creating lasting, renewable energy for your home isn’t as simple as slapping a solar panel on your roof and waiting for the meter to run backward. Instead, solar installers create solar electric systems that include several pieces of equipment that allow energy to safely flow to the proper areas.
There are several different types of solar electric systems, but many typically include the following devices:
  • Solar panels
  • An inverter
  • Wiring
  • A support structure
Grid-Connected Systems
These solar electric systems are the most common, allowing you to supplement energy from the utility company with energy from your solar panels. With this system, you’ll power your house with solar energy during the daytime as you generate it, while using power from the utility company at night or during cloudy periods.
Energy travels from your panels through wiring as Direct Current (DC) energy. This energy is best stored in batteries, and must be turned into Alternating Current (AC) energy before you can use it in your home.
This conversion occurs in the Inverter, which will allow you to use the energy you’ve produced in outlets throughout your home. The inverter is a critical component of any solar system, taking the formally unusable DC energy and converting it into AC energy.
This AC energy is then wired through your electricity meter, where it is treated as if it came from any typical energy source. The major difference is that if you generate more energy than you’re using, you can actually watch your meter run backwards, as you contribute to the energy grid. By contributing to the energy grid, it’s actually possible to gain money back from the utility company each month through net metering programs.
Solar Electric System with Battery Backup
Instead of relying on utility companies during cloudy days or dark nights, people with solar batteries can store unused solar energy over a period of time. With a battery attached to their solar system, people can last longer without using grid-based power sources.
Systems that have batteries typically involve the same devices as normal grid-connected systems, with the addition of a battery and charge controller. Charge controllers ensure your battery does not become overcharged, which can degrade the battery over time and lead to inefficiencies.
With the addition of a battery, you have the ability to live completely off the grid in some cases. Living completely off the grid requires many batteries, and not many homeowners choose this option. However, many do choose to retain their grid connection even with batteries, giving them a backup in case power is low.

What do I need to consider when buying solar panels?

Most solar panel installers do not manufacture their own panels, but offer several choices to consumers based on their specific needs. When you contact an installer, they’ll ask you about your energy needs and schedule an at-home consultation, allowing them to gauge your eligibility.
Those buying solar panels should pay attention to some of the following factors:
  • The Type of Solar Cell
  • Solar Efficiency rating
  • Roof Orientation and Shading
Types of Solar Cells
Not all solar panels are created equal. Actually, there are several different kinds you’ll be able to choose from when negotiating with installers. Depending on what your installer offers, you’ll have access to solar panels made from three main types of solar cells:
  • Monocrystalline Silicon Cells
  • Polycrystalline Silicon Cells
  • Thin Film Cells
Monocrystalline silicon cells are the most efficient kinds of solar cells, but also the most expensive. Monocrystalline cells are created from one single silicon crystal, and are usually cut into small wafers, then assembled into panels.
Polycrystalline silicon cells are the most common cells used in solar panels. Poly cells are less efficient than mono cells, but are also less expensive. Where the monocrystalline cell is cut from one large silicon crystal, polycrystalline cells are made up of many tiny crystals. You can identify polycrystalline panels from the geometric shapes within the cells.
Thin film panels are formed by coating a silicon mixture onto a flexible material, sacrificing efficiency for cost. While these panels are the cheapest to purchase, they require nearly twice as much space as poly and monocrystalline panels to produce the same amount of energy.
Solar Efficiency Rating
Years of technological research have created more effective solar cells, allowing us to convert more of the sun’s energy into electricity. A panel’s Solar Efficiency Rating refers to what percentage of solar energy absorbed is able to be converted into electricity (the previously mentioned process where electrons bounce between the silicon layers until some hit the metal strips).
Most residential solar panels typically offer between a 13% to 15% efficiency rating, but some companies have achieved higher. Most recently, SunPower Corp, a manufacturer of high efficiency solar cells, achieved an efficiency rating of 24.2%.
A panel’s efficiency can be impacted by a number of outside factors, including dust, dirt, and anything that could block light from hitting the solar cells. While solar panels generally require little maintenance, those are some of the first things you should check for if you notice a drop in efficiency.
Roof Orientation and Shade
In Colorado (and the rest of North America) the sun follows a southern path. This means that solar panels work best on south-facing roofs, with some systems losing efficiency even when facing southeast or southwest.
Aspects like roof tilt may require you to buy different mounting systems that allow you to position your panels in more efficient directions. The most common mounting systems for solar panels include ground mounts and roof mounts.
When even one solar cell on your panel is exposed to shade, it can lead to an up to 50% reduction in efficiency in that cell and surrounding cells in the panel. This means that wherever you install your solar panels, you must be aware of any trees, chimneys, or parts of the roof that could block sunlight during the day.

page source:http://www.colorado-solar.org/solar-power-guide.php

Sunday, November 1, 2015

Wind Power-wind energy

Wind Power

Wind power is the conversion of wind energy into useful form, such as electricity, using wind turbines and constitutes approximately 1% of global electricity output. Learn more.

The expanding market for wind power

Wind turbineMan has been capturing wind energy for millennia and it is now seen as an increasingly mainstream source of power.

It is forecast that, worldwide, the market for wind energy will continue its recent trend of growing massively (by 30-40% per annum). While much attention has been paid to the fact that China brings a new coal-fired power station on-line every ten days, less well known is the country’s interest in wind power: China has doubled its capacity every year since 2004 and is expected to be the world’s biggest wind power market by 2010.

How Wind Energy Works

Wind energy can be harvested in many different ways: with large scale wind farms featuring giant turbines, on or off shore; smaller embedded systems built in to office blocks and modern houses and domestic scale turbines (also known as ‘microwind’), often mounted to chimneys.

Regardless of the size of the turbine, the operating principles are the same: blades are angled into the prevailing wind at different degrees according to wind strength. When it reaches around 4 meters per second (mps), 30% less than the UK local average, the turbines start generating electricity.

They operate most efficiently in winds of around 15mps and have a variety of features built-in, such as variable blade pitch or designed-in ‘passive stall’ which ensure the system is not overloaded by gusts or storms where speeds may be far higher.

Criticisms of wind power

Perhaps surprisingly for an inexhaustible, clean energy source, wind power has been subject to intense criticism, principally for its relatively low overall availability (turbines only work to maximum effect when the wind speed is neither too low nor too high) and therefore cannot be relied on as a sole energy source.

Increasing the efficiency of wind power

Turbine efficiency is increasing year on year, in line with new investment and research. While there is some threat to bird life, especially if turbines are located in migration paths (as has been the case in the early days of the industry), this is no greater and probably less than that posed by any tall building and power cables – both of which are far more prevalent.

Case study: Building wind farms


Vestas has installed over 35,000 wind turbines and were responsible for the turbines at the UK’s first and largest offshore wind power plant at North Hoyle in Wales.


page source:http://www.imeche.org/knowledge/themes/energy/energy-supply/renewable-energy/

Learning on Renewable energy

The United States currently relies heavily on coal, oil, and natural gas for its energy. Fossil fuels are nonrenewable, that is, they draw on finite resources that will eventually dwindle, becoming too expensive or too environmentally damaging to retrieve. In contrast, renewable energy resources—such as wind and solar energy—are constantly replenished and will never run out.


Solar

Most renewable energy comes either directly or indirectly from the sun. Sunlight, or solar energy, can be used directly for heating and lighting homes and other buildings, for generating electricity, and for hot water heating, solar cooling, and a variety of commercial and industrial uses.

Wind
The sun's heat also drives the winds, whose energy is captured with wind turbines. The Earth's rotation also contributes to the winds, particularly through the Coriolis effect.

Biomass
Along with the rain and snow, sunlight causes plants to grow. The organic matter that makes up those plants is known as biomass. Biomass can be used to produce electricity, transportation fuels, or chemicals. The use of biomass for any of these purposes is called biomass energy.

Geothermal

Not all renewable energy resources come from the sun. Geothermal energy taps the Earth's internal heat for a variety of uses, including electric power production and the heating and cooling of buildings.

Hydrogen

Hydrogen also can be found in many organic compounds, as well as water. It's the most abundant element on the Earth. But it doesn't occur naturally as a gas. It's always combined with other elements, such as with oxygen to make water. Once separated from another element, hydrogen can be burned as a fuel or converted into electricity. Because energy is always needed to produce hydrogen, hydrogen is not in itself an energy source, but rather a way to store and transport energy, so it is often referred to as an energy carrier.

Ocean

The ocean can produce thermal energy from the sun's heat and mechanical energy from the tides and waves. Tides are driven by the gravitational pull of the moon and sun upon the Earth, while waves are driven by winds blowing over the ocean's surface. See the U.S. Department of Energy's Energy Savers for basic information on ocean energy.

Hydropower

Flowing water creates energy that can be captured and turned into electricity. This is called hydroelectric power or hydropower. For more information on hydroelectric power, see the hydropower basics from the U.S. Department of Energy's Water Power Program.


source:http://www.nrel.gov/learning/