Showing posts with label solar. Show all posts
Showing posts with label solar. Show all posts

Tuesday, September 14, 2010

Bags with solar charger

The above is a solar powered backpack with trolley case capable of charging any personal devices. This solar power backpack with trolley case charger can be used to charge mobile phones, digital cameras and MP3/MP4 players. It comes with enough charging adapters to power up just about any major mobile phone on the market as well. Its onboard battery pack can be charged by solar power and/or by connecting to an AC outlet power supply.
The above bag is integrated with solar powered panels to charge phones on the road. The portable charger is able to charge gadgets like notebook as well.

Solar powered glow brick

The above is a solar powered glow brick capable of glowing at night. This gadget can be charged from the sun. At night, the stored energy is released, causing the solar light bulb to glow green. The glow Brick makes a cool home accessory or can be used as a comforting night light for children.

The above is a solar powered mini clip fan capable of blowing air. This gadget can be charged from the sun. This mini clip fan is an innovative device which helps to stay cool during the hot summer days. This light weight fan can be cliped on to the hat and gets power from the sun’s rays. This is a cool home accessory.

Solar powered plant pot and mower

The above is a solar powered plant pot. This works in the same way as any other solar powered lamp works. The only difference is that this pot can hold a nice plant and delight our eyes with flashing colour. This pot comes in either white or the one wich flashes in several different colors and look nice at night.

The above is a solar powered lawn mower capable of cutting lawn grass and it can be programed to come on and automatically mow the lawn whenever needed. This hybrid gadget can also be charged from the mains as well as the sun.It also has embedded sensors to safely navigate around garden obstacles to give the lawn a perfect cut.

Solar PV toy car

A mini solr photo voltaic (PV) panel powered car is shown above. It is claimed as the smallest solar car ever developed. As you know it can move under sun light or when bright light rays fall on it, very similar to the power source for solar calculators. This is really a miniaturisation attempt against the fast development of solar PV powered cars running on streets.

Wednesday, September 8, 2010

Solar powered toothbrush-Toothbrush that doesn't need toothpaste


A team of researchers led by Dr. Kunio Komiyama, a dentistry professor emeritus at the University of Saskatchewan in Saskatoon, Saskatchewan, Canada, has invented a toothbrush that makes a solar-powered chemical reaction in a person's mouth to clean their teeth.

With their latest invention, researchers can eliminate the need to use toothpaste. Currently Komiyama and his colleague Dr. Gerry Uswak are searching for volunteers to test their new toothbrush, dubbed the Soladey-J3X.

Manufactured by a Japan-based company the Shiken, the latest invention is to be tested by 120 youngsters.

It is worth mentioning that the Soladey-J3X uses a solar panel installed at its base to send electrons to the top of the toothbrush via a lead wire. The electrons then come into reaction with acid in the mouth, thus leading to a chemical reaction that not only breaks down plaque but also kills bacteria.

Tuesday, September 7, 2010

Top Solar Powered Gadgets for everyday use

1. Solar Powered Tent:- The solar powered tent has its own solar panel and integrated interior LEDs. The solar panels independently charges batteries and 4-6 hours of direct light are enough to produce 2-4 hours tent light. There mainly two version of the tents. One having the capacity of 4-person and another having the capacity of 6 person.



2. Sunflower Solar Power Station:-It is a new and powerful home and office equipment. It has a solar powered music system. In this device electricity is generated with the help of solar energy through three built in standard sockets. The top solar panel receives solar energy during day time and the rechargeable solar batteries keep the appliances working throughout the night.



3. Voltaic Solar Backpack:- Voltaic Solar Backpack is very useful during business trips and campings. This solar backpack has several pockets and wire channels to keep and charge the electronic devices like cell phones, PDA's and handheld GPS, mp3. It has a Li Ion battery charger that stores excess power from sunny days for charging when the durable, water and scratch-proof solar panels don’t get enough of sun rays. It has three solar panels which operates independently to generate 4 watts of power. It has a set of 11 standard adaptors to charge other devices and a car lighter adapter.



4. Solar Attic Fan:- It is a compact, simple and environment friendly fan that is powered completely by solar energy. It is constructed of .080 (14 gauge) aluminum. It has a hardware made up of stainless steel and a animal protection screen made up of stainless steel. It is also coated with powder to withstand any environment. This solar attic fan reduces the temperature of attic, save stress on the cooling system, conserves power, and saves your money.



5. Solar Panel Sun Glasses:- These sunglasses has the ability to trap the solar energy and than convert it into electric energy. So that it can charge the small hand held devices through the power jack at the back of the frame. This Gadget is very useful. It protects from sun tanning, also helps to listen iPod. Just Zap these glasses on and start charging your iPod.



6. Voltaic Generator Solar Laptop Charger:- Voltaic Generator Solar Laptop Charger is a more efficient version of freeloader solar charger. It is the first of its kind. It has enough power to charge a laptop. This gadget has high-efficiency cells and also includes a battery pack that is custom designed to store and convert the electricity generated more efficiently. It is also useful in charging cell phones and other hand held electronics.



7. Solar Under Ground Pest Deterrent:-It is an environment friendly pest deterrent powered by an integrated solar panel that helps to bring out underground pests like moles, voles, and gophers without any complicated set up or external power. On putting the waterproof anodized aluminum spike on the ground, it emits sonic vibrations every 30 seconds that irritate burrowing pests and compel them to split up.



8. Solar Hanging Lights and Lanterns:- As the name reflects Solar Hanging Lights and lanterns runs with the help of solar energy. These Solar Hanging Lights are made of the highest quality materials and utilize the latest LED Lighting technology for maximum brightness, and extra long run times. These lights creates a wonderful Victorian Lantern effects as well as provides additional functionality for ground placement, table placement or it can simply remove from the solar lantern from the hook and can be hang any where.



9. Freeloader Solar Charger:- If you want to take your gadgets during trips. Than you must require the Solar Powered Portable charger. This Freeloader solar charger is an advanced portable charging system that can power any hand held mobile device anywhere. Once charged, Freeloaders internal battery can power an iPod for 18 hours, a mobile phone for 44 hours, PSP for 2.5 hours and a PDA for 22 hours.



10. Solar Power purse:- Jo Hynek,a doctoral student has designed the "Power Purse" . It puts function over form. It is a fashion-friendly gadget, which is covered with solar panels. It is designed to charge all the mobile accessories such as cell phones, mp3 players, etc.

Solar PV powered cordless fan

Solar energy is really taking over every aspect of our lives and if you are willing to spend that extra initial amount, then it really can go a long way in making sure that you never run out of power. Solar gadgets are only growing in number, but they are surely going down in price in the last few years. If technology for cheaper synthesis of solar cells and fabrication of solar panels indeed takes off, then we could soon be living a very bright and clean life.

The fan has a set of accessories that include LED lamp, quartz clock, mobile phone charger and battery charger. The powerful 12V 4.5Ah sealed lead acid battery can be charged by the solar panel during the day or can be charged via an AC/DC adaptor. Typically, on a full charge the unit will give you up to six to eight hours of fan use on full speed and twelve to sixteen hours at low speed and five to seven hours of light.

Sunday, March 15, 2009

Producing solar cell-grade silicon from rice hulls

Production of high purity solar grade silicon can be made from common rice hulls. A unique process for material purification and reduction includes leaching the rice hulls in acid followed by treatment with high purity water, coking the acid-cleaned hulls in a non-oxidizing ambient, compensating the carbon or silica content of the coked hulls to obtain a desired carbon to silica ratio and reducing the silica to produce high purity silicon. The size of the rice hulls is decreased by grinding or milling, the rice hull is leached in with aqueous hydrochloric acid and rinsing in distilled water to reduce the impurity level in the rice hulls to below about 400 ppm., the leached rice hull is coked by pyrolyzing the rice hulls at a temperature of about 920.degree C in a non-oxidizing atmosphere comprising a gaseous mixture of an inert gas comprising about 1% anhydrous hydrogen chloride and at least one of the group of anhydrous acids consisting of HCl, HBR, and HI to produce a composite of carbon and silica by adjusting the carbon to silica ratio of the coked rice hulls to less than about 2:1 and thermally reducing the adjusted carbon and silica mixture to produce elemental silicon.

Monday, March 9, 2009

Liquid Battery for Solar Energy Storage

One of the biggest challenges currently facing large-scale solar energy technology is finding an effective way to store the energy, which is essential for using the electricity at night or on cloudy days. Recently, researchers from MIT have designed a new kind of battery that can quickly absorb large amounts of electricity, as required for solar energy storage. Unlike conventional batteries it is made of all-liquid active materials. The battery consists of three layers of liquids: two electrode liquids on the top and bottom and an electrolyte liquid in the middle forming the three distinct layers. In the first prototype, the electrodes were molten metals - magnesium on the top and antimony on the bottom - while the electrolyte was a molten salt such as sodium sulfide. When charging, the solid container holding the liquids collects electrons from exterior solar panels or another power supply, and later, for discharging, the container carries the electrons away to the electrical grid to be used as electricity. As electrons flow into the battery, magnesium ions in the electrolyte gain electrons and form magnesium metal, rising to form the upper molten magnesium electrode. At the same time, antimony ions in the electrolyte lose electrons and sink to form the lower molten antimony electrode. At this point, the battery is fully charged, since the battery has thick electrode layers and a small layer of electrolyte. To discharge the electrical current, the process is reversed, and the metal atoms become ions again. The batteries are expected to be inexpensive and simple to manufacture but likely to have the inherent problems associated with handling of liquids.

Monday, January 5, 2009

High efficiency solar systems developed

Conventional solar systems have an efficiency of only14 percent. Anna Dyson of Rensselaer Polytechnic Institute in Troy, New York has developed a system that gives combined heat and power with an efficiency of nearly 80 percent by efficiently capturing and transferring light into electricity and the solar heat into hot water. According to Anna Dyson the new system uses high-tech solar-concentrator technology and the system has stacks of pivoting lenses that senses the position of sun at any time and the modules are made to face the sun directly to focus sun rays onto high-tech solar cells. The key breakthrough is the miniaturized concentrator solar cell, which uses a lens with concentric grooves to focus collected light. Even though it is only the size of a postage stamp compared to the usual solar collector area that spans 4 x 4 feet, the cell is much more efficient in collecting and reusing solar energy. Micro channels at the base of the module transfer energy in the form of heat and light to wires contained inside. Each vertical stack of lenses rolls and tilts to track the sun. Incorporating these new cells into arrays could make solar energy an option that is competitive with other energy sources, reducing our dependency on fossil fuels. The lenses can be nestled between window panes and all of the pieces can be made of glass to lower the lighting needs of buildings, as it will provide usable light inside. It could supply as much as 50 percent of the energy needed for a building to operate. According to Anna Dyson the full-size prototype will be incorporated into a new building at The Center of Excellence in Syracuse, New York.

Saturday, October 25, 2008

Mitsubishi Electric manufactures high efficiency PV cells

Solar power is a clean way to generate electricity that’s not only environmentally friendly, but economical. photovoltaic modules that gather energy from the sun, and release it as electricity that can power home or office to save on energy costs while helping protect the planet and to bring clean, reliable energy to residences, business, power-generation plants, schools, factories and areas without access to electricity, as well as other applications such highway and stadium lighting.
Photovoltaic modules manufactured by Mitsubishi Electric’s utilize polysilicon technology which is known for their high reliability, high-efficiency, and low environmental impact with 25-year limited warranty on power output.Solar cells have separate connecting tab wiring between the front and back sides. This is an effective step toward optimization of connecting conditions, while curving cell warp to support the move toward thinner solar cells.For the silver electrodes formed on the solar cell surface, an exclusive composition and manufacturing process is used by them that excel in environmental resistance and introduced industry-first introduction of mass-produced “solder-coatingless cells”. This removes lead (traditional lead-solder modules use about 860 grams of lead) which is harmful to the human body, while the expanded light reflection effects with the solderless status improve cell efficiency. Mitsubishi Electric has developed fine grid electrodes with an optimal BSF structure and use of anti-reflective coating for the solar cell manufacturing process which has expanded the solar cell light receiving area to realize high-efficiency cells.Solar cell string pitch have been expanded and the high reflectance back film reflects light to raise module efficiency.Use of glass that is cerium-free and high in transmittance has defined a new dimension in high efficiency, free of initial deterioration.

Friday, October 17, 2008

Towards 50% efficiency solar cells

Allen Barnett and Christiana Honsberg have a project under DARPA Very High Efficiency Solar Cell (VHESC) program on developing affordable portable solar cell battery chargers. They have integrated the optical design with the solar cell design leading to a new paradigm about how to make solar cells and how to use them. It is claimed that an advance of 2 percentage points is noteworthy in a field where gains of 0.2 percent are the norm and gains of one percent are seen as significant breakthroughs with regard to solar cell efficiency.They aim at a major step toward their goal of 50 percent efficiency of solar cell. The percentage will be a record under any circumstance, but it's particularly noteworthy because it's at low concentration, approximately 20 times magnification. The low profile and lack of moving parts mean that these devices easily could go on a laptop computer or a rooftop.

Improving efficiency of solar cells

Photovoltaic (PV) cells are made of special materials called semiconductors such as silicon, which is currently the most commonly used. When sun light strikes the cell, energy knocks electrons loose and the flow of electrons is a current. By placing metal contacts on the top and bottom of the PV cell, we can draw that current off to use externally. Many factors limit the efficiency of photovoltaic cells. Silicon is cheap, for example, but in converting light to electricity it wastes most of the energy as heat. The most efficient semiconductors in solar cells are alloys made from elements from group III of the periodic table, like aluminum, gallium, and indium, with elements from group V, like nitrogen and arsenic. One of the most fundamental limitations on solar cell efficiency is the band gap of the semiconductor from which the cell is made. The maximum efficiency a solar cell made from a single material can achieve in converting light to electrical power is about 30 percent; the best efficiency actually achieved is about 25 percent.
One way of improving efficiency is to use two or more layers of different materials with different band gaps. The higher band gap material is on the surface, absorbing high-energy photons while allowing lower-energy photons to be absorbed by the lower band gap material beneath. This technique can result in much higher efficiencies. Such cells are called multi-junction cells.
Instead of using a germanium wafer as the bottom junction of the device, the new design uses compositions of gallium indium phosphide and gallium indium arsenide to split the solar spectrum into three equal parts that are absorbed by each of the cell's three junctions for higher potential efficiencies. This is accomplished by growing the solar cell on a gallium arsenide wafer, flipping it over, and then removing the wafer. The resulting device is extremely thin and light and represents a new class of solar cells with advantages in performance, design, operation and cost.
A team led by John Geiszat of the U.S. Department of Energy's National Renewable Energy Laboratory (NREL) have set a world record in solar cell efficiency with a photovoltaic device that converts 40.8 percent of the light that hits it into electricity. This is the highest confirmed efficiency of any photovoltaic device to date.
Presently using a novel technology that adds multiple innovations to a very high-performance crystalline silicon solar cell platform, a consortium led by the University of Delaware (UD) has achieved a record-breaking combined solar cell efficiency of 42.8 percent.

Monday, October 13, 2008

Solar power for India

The best form of renewable energy available to the developing countries is the solar energy. This is due to the fast changing world energy scenario, particularly for emerging economies such as India and China on account of the rising costs of oil and coal. India is a small player in the world photovoltaic cells market, yet 69% of its modules are exported. The rest are put to use mainly in telecommunications and lighting homes. Solar PV modules are developed in the industrialised countries despite the fact that their energy efficiency is 15-20% is because of rising fossil fuel costs and the need to contain greenhouse gas emissions. Germany, Spain, Japan, China and the US are the leading PV module makers, with Germany making up almost half the world’s output of about 3,800 MW. China’s PV cell output was 820 MW in 2007, ten times that of India. It is time India broke into the big league, to take advantage of global technological transition. If wind power generation has risen sharply in the last decade to account for 80% of India’s renewable energy output of over 10,000 MW, the next decade could belong to solar. While the installed capacity for wind power is limited close to 8,000 MW, which is little more than 2 MW in the case of grid-connected solar power.

Saturday, October 11, 2008

Photovoltaic power

Photovoltaic systems and power plants have emerged as viable power sources for applications such as lighting, water pumping and telecommunications and are being increasingly used for meeting electrical energy needs in remote villages, hamlets, hospitals and households. PV systems, when used on a large scale, can cut down the need for extending the distribution grids in rural areas and the resultant losses in transmission. Solar Photovoltaic (SPV) water pumping systems are technically proven and have potential of replacing diesel pumping systems, commonly used in un electrified locations for lifting water from shallow depths. The pumps can also bring the benefits of irrigation and drinking water supply in backward areas not served by the exiting grid and where supplying diesel is a problem. It is clear that there is a vast potential for the use of solar photovoltaic technology in the developing countries.