The Beginning Of Solar Energy

Solar power has been known about for a long time. Although the capacity of sunlight to generate a charge had been understood since the early 19th century, it took around another 100 years for science to create workable solar panels to harness this power.

The Beginning

Photovoltaic effect, the conductivity resulting from the build-up of charge between two electrodes under direct sunlight, was first noted by French physicist Becquerel in 1839. Although some experiments had attempted to harness the tiny charges that could be harnessed, using primitive strips of selenium bound with gold connectors, they barely produced enough wattage to make the needle move

Albert Einstein

As late as 1905 Albert Einstein had established the physical properties of Photoelectric Effect, but the technology simply did not exist to support his theories. It would take until 1954 for Bell Laboratories to come up with a workable selenium cell designed to produce a constant charge.

Initial Problems

Even then, the reception was lukewarm. The main problem was that 1 watt of power generated through this array cost $250 in manufacturing and production costs; a similar amount of power generated from coal cost around $2. There seemed to be nobody interested in finding a practical use for the technology.

Use in Space

Salvation came from the heavens, and the space race was a great accelerator of events. From 1957 artificial satellites orbited the earth, but their limited battery life meant that they could only effectively transmit for a few days or weeks. In 1958 Bell’s array powered the US Navy satellite Vanguard 1, which allowed it to transmit for 7 years until its transmitter failed; amazingly, it is still in orbit today and shows no signs of stopping.

The Gradual Rise

The success of Vanguard 1 meant the widespread adoption of solar cell technology for space missions. As orbiting spacecraft greeted the sunrise once every 90 minutes, it seemed a perfect solution. By 1973 the solar cell was not only helping probes make the most of every bit of sunlight on their way to the farthest reaches of the solar system, and was powering life support systems on space stations. This also led to new manufacturing techniques and a lower unit cost for the technology. However, even at this point, solar panels on Earth still cost over $100 to produce 1 watt of electricity. Apart from spacecraft and ships, there seemed to be few practical applications for solar panels.

Solar Energy as an Eco Friendly Alternative

The Oil Crisis of 1973 led to renewed efforts to make the technology workable. With Middle Eastern producers snubbing the west, governments realised just how acutely vulnerable their energy supply was and sought alternatives. This led to the development of solar panel companies by the major petroleum producers, and the invention of thin selenium strips sandwiched under sheets of glass. Efficiency also increased, allowing production costs of around $1 per watt – lower than coal. By 1979 a 600 watt array was providing lift for the world’s first solar-powered aircraft – the Gossamer Penguin. Solar power was here to stay.

People like you and I can now take advantage of solar energy by installing solar panels in our home. Solar Contact can provide information on different solutions for solar energy in the home and put you in contact with local solar energy experts.

Solar Energy Has Many Uses

Solar energy is the sunshine and the heat from the sun, is free and is infinite. All living matters on earth depends on it. Solar energy induce no air and water pollution, but there is still some impacts on the environment although indirect.

Photovoltaic cells (solar panels) used to convert sunlight into electricity uses silicon that also produce some waste materials. There are also large solar thermal farms and these farms can also be harmful to the environment and desert ecosystems if not properly managed.

Solar energy has many uses, for example, in agriculture. Greenhouses convert solar light to heat to enhancing the growth of plants and crops. Greenhouses has been around since the Roman times, today’s modern greenhouses were first built in Europe in 16th century. Greenhouses are still an important part of horticulture nowadays,

Daylight systems are being used in homes and businesses to maximize the energy released by the sun. It is used to provide interior illumination replacing the artificial lighting. Daylight systems include sawtooth roofs, light shelf, skylights, and light tube. Daylight systems when they are properly applied can cut down lighting-related energy consumption by as much as 25 percent.

Solar energy can also be formulated into solar thermal technologies which can be used for water heating, space heating, space cooling and process heat generation. Solar energy can also be used to distill water and make saline or brackish water potable or drinkable.

The solar water disinfection or SODIS involves exposing water-filled plastic polyethylene terephthalate or PET bottles. This process takes a long time, since the exposure time varies on the weather conditions. It requires at the least of six hours to two days during days with overcast conditions. Today, there are more than two million people in developing centuries use SODIS for their daily drinking water needs.

As well sunlight can be converted into electricity using photovoltaics or PV. PV has been mainly used to power small electronics like a calculator powered by a single solar cell to homes and businesses using solar panels. Using solar energy for water and space heating is the most widely use application of solar energy. While ventilation and solar air heating is also growing in popularity.

Solar cells, also called photovoltaic or photoelectric cells are use to convert sunlight directly into electricity. Also, solar furnaces use a huge array of mirrors to concentrate on the Sun’s energy into a small space and produced very high temperatures. Solar furnaces are also called “solar cookers”. A solar cooker can be used in hot countries to prepare food.

With all the benefits if using solar energy, there is still a downside for this alternative energy source. It does not work during night time. The cost of setting up solar systems is expensive, but the benefit of using solar energy when cumulated is so much more especially with decreasing prices as more users opting to use this source of renewable energy.