How solar energy works ?
Solar energy technologies use the energy that comes from the sun. Inside the sun, hydrogen atoms combine to make helium, and the process produces the extreme amount of heat that is felt on Earth. The core of the sun has a temperature of 36,000,000 °F (20,000,000 _ C). The surface of the sun, called the photosphere, has a temperature of 10,000 _ F (5,538 _ C). The energy that the sun creates has to travel 93,000,000 miles (150,000,000 kilometers) to reach the surface of Earth.
People on Earth do not feel the full force of the sun, because Earth's upper atmosphere blocks out much of the sun's thermal power. This power, sometimes called radiation, is spread out when it hits the water vapor, molecules of gas, and clouds that surround Earth. The sunlight that does reach the ground is called direct radiation or beam radiation. If the sunlight hits something before reaching the ground, it is called diffuse radiation.
The amount of solar radiation that reaches the surface of Earth is more than ten thousand times the amount of energy used by the world already. A significant amount of the sun's radiant energy, about 69 percent, is reflected back into space by such things as clouds, ice found on the ice caps, land, and bodies of water. Of the energy that is absorbed by Earth, about 70 percent of the absorption is done by the oceans. Solar energy helps keep the oceans from freezing and pushes their currents. It also prevents Earth's atmosphere from freezing.
Current solar technology
Solar technologies can be divided into passive systems or active systems. Passive solar energy projects only employ the sunlight; no other forms of energy are used. Active solar energy systems employ additional mechanisms such as pumps, blowers, or generators to apply or add to the solar energy created. Active systems often make electricity or heat. Solar water heating systems can be either active or passive.
Passive solar systems
Passive solar systems are primarily concerned with the design of buildings, homes, and lighting. Passive solar design focuses on the placement of the home or building and on windows, ventilation, and insulation to cut down on the need for electricity by using the sun. The home or building is designed to maximize the potential of solar energy for heating and cooling. In northern countries such as Canada, where sunshine is not as strong as it is in locations to the south, passive solar heating is one of the easiest forms of solar technology to use.
One important form of passive solar design is known as ''daylighting.'' In daylighting the placement and design of windows is used to encourage natural sunlight to light the inside of a building instead of electric lights. Daylighting helps cut down on lighting costs, and many experts believe that exposure to natural rather than artificial light sources provides health benefits to humans.
Another type of passive solar system is the transpired solar collector. This is a relatively new passive solar technology made of dark perforated metal. Transpired solar collectors are used to heat buildings by heating the air. They can also cool buildings in summertime.
Active solar systems
Active systems include solar collectors (also known as solar panels), which are primarily used on solar hot water heaters; photovoltaic (PV) cells, which make electricity; and concentrated solar power systems (also known as solar thermal systems), which also make electricity but on a larger scale than PV cells.
Solar collectors are used primarily to capture solar energy for use in solar hot water heaters. However, they can also be used to provide heat in a building and even to make the energy to cool a building. While not all solar collectors are used in active solar energy systems, it is more common for solar collectors to be used in an active system than a passive system.
Photovoltaic (PV) cells convert sunlight directly into electricity inside the cell. They are more adaptable than many other types of solar energy technology. In addition to powering satellites, PV cells can be put on buildings to provide electricity for any number of uses.
They do not require direct sun to convert sunlight into electricity. There are at least five types of concentrated solar power systems that focus the sun's power to make electricity on a larger scale than PV cells. They include solar ponds, parabolic trough systems, dish systems and dish-engine systems, solar power towers, and solar furnaces. Mirrors or other reflective devices draw in as much sunlight as possible to these systems. They often track the sun as it moves through the sky in order to capture the most sunlight.
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Concentrated solar power systems usually heat water, or another fluid that is connected to a source of water, to make steam. The steam is used to drive turbines that create electricity. Concentrated solar power systems are primarily used for industrial applications and to make electricity for consumers and businesses on a wide scale.
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¿Cómo trabaja la energía solar?
Las tecnologías de energía solar utilizan la energía que viene del sol. Dentro del sol, los átomos de hidrógeno se combinan para formar helio, y el proceso produce la extrema cantidad de calor que se siente en la tierra. El núcleo del sol tiene una temperatura de 36.000.000 °F (20.000.000 °C). La superficie del sol, llamada la fotosfera, tiene una temperatura de 10,000 °F (5,538 °C). La energía que el sol crea tiene que viajar 93.000.000 millas (150.000.000 kilómetros) para alcanzar la superficie de la Tierra.
La gente en la tierra no siente la fuerza completa del sol, porque la atmósfera superior de la tierra bloquea mucha de la energía térmica del sol. Esta energía, a veces llamada radiación, se dispersa cuando choca el vapor de agua, las moléculas de gas, y las nubes que rodean la Tierra. La luz del sol que alcanza la tierra se llama radiación directa o radiación de haz luminoso. Si la luz del sol choca algo antes de alcanzar la tierra, ésta se llama radiación difusa.
La cantidad de radiación solar que alcanza la superficie de la Tierra es más de diez mil veces la cantidad de energía que el mundo ya utilizó. Una cantidad significativa de la energía radiante del sol, el cerca de 69 por ciento, es reflejada nuevamente hacia de espacio por cosas tales como las nubes, hielo encontrado en los casquetes glaciares, tierra, y las aguas de superficie. De la energía que es absorbida por la Tierra, cerca del 70 por ciento de la absorción es hecha por los océanos. La energía solar ayuda a evitar que los océanos se congelen y empuja sus corrientes. También evita que la atmósfera de la Tierra se congele.
Tecnología solar actual
Las tecnologías solares se pueden dividir en sistemas pasivos o sistemas activos. Los proyectos de energía solar pasivos emplean solamente la luz del sol; no se utiliza ningunas otras formas de energía. Los sistemas de energía solar activos emplean mecanismos adicionales tales como bombas, sopladores, o generadores para aplicar o para agregarse a la energía solar creada. Los sistemas activos con frecuencia generan electricidad o calor. Los sistemas solares para calefacción de agua pueden ser tanto activos como pasivos.
Sistemas solares pasivos
Los sistemas solares pasivos se refieren básicamente al diseño de edificios, de hogares, y de iluminación. El diseño solar pasivo se centra en la ubicación del hogar o del edificio y en ventanas, la ventilación, y la aislación para reducir la necesidad de electricidad usando el sol. El hogar o el edificio se diseñan para maximizar el potencial de la energía solar para la calefacción y refrigeración. En países del norte tales como Canadá, donde la luz solar no es tan fuerte como lo es en localidades al sur, la calefacción solar pasiva es una de las formas más fáciles de tecnología solar a utilizar.
Una forma importante de diseño solar pasivo se conoce como "luz de día". En la "luz del día" la colocación y el diseño de ventanas se utilizan para propiciar que la luz del sol natural ilumine el interior de un edificio en vez de luces eléctricas. La "luz del día" ayuda en la reducción del costo de la iluminación, y muchos expertos creen que la exposición a fuentes de luz naturales en lugar de artificiales proporciona beneficios a la salud de los seres humanos.
Otro tipo de sistema solar pasivo es el colector solar transpirado. Esta es una relativamente nueva tecnología solar pasiva hecha de metal perforado oscuro. Los colectores solares transpirados son utilizados para calentar edificios calentando el aire. Pueden también refrescar edificios en verano.
Sistemas solares activos
Los sistemas activos incluyen los colectores solares (también conocidos como paneles solares), que se utilizan sobre todo en los calentadores de agua caliente solares; células fotovoltaicas (PV), que hacen electricidad; y sistemas eléctricos solares concentrados (también conocidos como sistemas térmicos solares), que también hacen electricidad pero en una escala más grande que las células PV.
Los colectores solares se utilizan sobre todo para capturar la energía solar para el uso en calentadores de agua caliente solares. Sin embargo, pueden también ser utilizados para proporcionar calor en un edificio e incluso para generar la energía para refrescar un edificio. Mientras que no todos los colectores solares se utilizan en sistemas de energía solar activos, es más común que los colectores solares sean utilizados en un sistema activo que en un sistema pasivo.
Las células fotovoltaicas (PV) convierten la luz del sol directamente en electricidad dentro de la célula. Son más adaptables que muchos otros tipos de tecnología de energía solar. Además de impulsar satélites, las células fotovoltaicas se pueden poner en edificios para proporcionar electricidad para cualquier número de aplicaciones.
No requieren sol directo para convertir la luz del sol en electricidad. Hay por lo menos cinco tipos de sistemas eléctricos solares concentrados que enfocan la energía del sol para hacer electricidad en una escala más grande que las células fotovoltaicas. Incluyen los estanques solares, los sistemas concentradores cilíndrico- parabólicos, los sistemas de plato y los sistemas de plato-motor, las torres de energía solar, y los hornos solares. Los espejos u otros dispositivos reflectivos captan tanta luz del sol como sea posible para estos sistemas. Siguen a menudo el sol mientras que se mueve a través del cielo para capturar la mayoría de la luz del sol.
Los sistemas eléctricos solares concentrados generalmente calientan el agua, u otro líquido que esté conectado con una fuente de agua, para hacer el vapor. El vapor se utiliza para impulsar las turbinas que crean electricidad. Los sistemas eléctricos solares concentrados se utilizan sobre todo para usos industriales y para generar electricidad para los consumidores y negocios a gran escala.
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42"" Solar Lamp Post-Black Finish
Reminiscent of the Late 19th Century! Illuminate or line your walkway with our 3.5' energy efficient, super-bright low lamp post. The LED lights use a special patented cone reflector to make the light brighter in each of our solar lamp posts. The gas-light design of our solar lamp lights is classic and adds an elegant appeal to your front or back yard. Products Details: 42"" Height Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Click on Image for Night Time View Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalline Solar Cell Light Duration Up to 2 nights Low Price Guarantee! [Read more]
Brand: Gamasonic
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42"" Solar Lamp Post-Rust Red
Reminiscent of the Late 19th Century! Illuminate or line your walkway with our 3.5' energy efficient, super-bright low lamp post. The LED lights use a special patented cone reflector to make the light brighter in each of our solar lamp posts. The gas-light design of our solar lamp lights is classic and adds an elegant appeal to your front or back yard. Products Details: 42"" Height Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Click on Image for Night Time View Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalline Solar Cell Light Duration Up to 2 nights Low Price Guarantee! [Read more]
Brand: Gamasonic
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88"" Solar Lamp Post-Black Finish
Reminiscent of the Late 19th Century! Line your drive / walkway with of our 7' solar lamp posts. Using a special patented cone reflector to make the light brighter this tall lamp post will illuminate your pathway with our energy efficient, super-bright LED's. The gas-light design of our solar lamp is classic and adds an elegant appeal to your front or back yard. Products Details: 88"" Height Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Click on Image for Night Time View Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalline Solar Cell Light Duration Up to 2 nights Low Price Guarantee! [Read more]
Brand: Gamasonic
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88"" Solar Lamp Post-Rust Red
Reminiscent of the Late 19th Century! Line your drive / walkway with of our 7' solar lamp posts. Using a special patented cone reflector to make the light brighter this tall lamp post will illuminate your pathway with our energy efficient, super-bright LED's. The gas-light design of our solar lamp is classic and adds an elegant appeal to your front or back yard. Products Details: 88"" Height Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Click on Image for Night Time View Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalline Solar Cell Light Duration Up to 2 nights Low Price Guarantee! [Read more]
Brand: Gamasonic
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Double Solar Lamp Post-Black Finish
Reminiscent of the Late 19th Century! Our 7' high solar powered traditional styled lamp posts are in high demand and come with 2 lights which use a special patented cone reflector to make the light brighter. This all aluminum construction tall lamp post will illuminate your garden with our energy efficient, super-bright LED's. The gas-light design of our solar lamp is classic and adds an elegant appeal to your front or back yard. Products Details: 85"" Height Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Click on Image for Night Time View Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalline Solar Cell Light Duration Up to 2 nights Lo... [Read more]
Brand: Gamasonic
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Double Solar Lamp Post-Rust Red
Reminiscent of the Late 19th Century! Our 7' high solar powered traditional styled lamp posts are in high demand and come with 2 lights which use a special patented cone reflector to make the light brighter. This all aluminum construction tall lamp post will illuminate your garden with our energy efficient, super-bright LED's. The gas-light design of our solar lamp is classic and adds an elegant appeal to your front or back yard. Products Details: 85"" Height Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Click on Image for Night Time View Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalline Solar Cell Light Duration Up to 2 nights Lo... [Read more]
Brand: Gamasonic
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Solar Lamp Post Fixture-Black Finish
Reminiscent of the Late 19th Century! Our energy efficient Lamp posts are also available as a seperate fixture for you to replace outdated technology or low voltage lights. They have super-bright LED's which use a special patented cone reflector to make the light brighter. The gas-light design of our solar lamp light is classic and adds an elegant appeal to your front or back yard. Products Details: 17.5"" Height Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalline Solar Cell Light Duration Up to 2 nights Low Price Guarantee! [Read more]
Brand: Gamasonic
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Solar Lamp Post Fixture-Rust Red
Reminiscent of the Late 19th Century! Our energy efficient Lamp posts are also available as a seperate fixture for you to replace outdated technology or low voltage lights. They have super-bright LED's which use a special patented cone reflector to make the light brighter. The gas-light design of our solar lamp light is classic and adds an elegant appeal to your front or back yard. Products Details: 17.5"" Height Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalline Solar Cell Light Duration Up to 2 nights Low Price Guarantee! [Read more]
Brand: Gamasonic
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Tabletop Solar Lamp Post-Black Finish
Reminiscent of the Late 19th Century! Install or replace your outdated or low voltage lights with our all new range of solar powered lamp posts. This model comes ready to install on your pillar or deck and has our super-bright LED's which use a special patented cone reflector to make the light brighter. The gas-light design of our solar lamp light is classic and adds an elegant appeal to your front or back yard. Products Details: Dimensions: 13""H x 9"" W Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Click on Image for Night Time View Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalline Solar Cell Light Duration Up to 2 nig... [Read more]
Brand: Gamasonic
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Tabletop Solar Lamp Post-Rust Red
Reminiscent of the Late 19th Century! Install or replace your outdated or low voltage lights with our all new range of solar powered lamp posts. This model comes ready to install on your pillar or deck and has our super-bright LED's which use a special patented cone reflector to make the light brighter. The gas-light design of our solar lamp light is classic and adds an elegant appeal to your front or back yard. Products Details: Dimensions: 13""H x 9"" W Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Click on Image for Night Time View Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalline Solar Cell Light Duration Up to 2 nig... [Read more]
Brand: Gamasonic
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The Illuminator Solar Address Lamp
Energy Saver-No Wires Needed! Make it easier for delivery and emergency vehicles to find your house at night with this solar powered Address Lamp. Designed to mount above your existing address plaque, this solar lamp automatically turns on at dusk and off at down, with super bright LED lights that will help visitors read your house number, even in the dark. This lamp easily mounts to brick, wood, siding, or any other wall. that last for more than a year. Features: Automatically turns on at dusk - off at dawn Super bright LED lights Includes two (2) AA rechargeable (NiMH) batteries Provides a full night of illumination Please allow 2 to 3 weeks for delivery Matte black finish Dimensions: 2""H x 6.75""W x 7""D Low Price Guarantee! [Read more]
Brand: Whitehall
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Triple Solar Lamp Post-Black Finish
Reminiscent of the Late 19th Century! Enjoy a romantic evening with your loved one under the glow of our 7' high solar powered traditional styled lamp posts. They come with 3 lights which use a special patented cone reflector to make the light brighter. This all aluminum construction tall lamp post will illuminate your garden with our energy efficient, super-bright LED's. The gas-light design of our solar lamp is classic and adds an elegant appeal to your front or back yard. Products Details: 90"" Height Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Click on Image for Night Time View Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalli... [Read more]
Brand: Gamasonic
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Triple Solar Lamp Post-Rust Red
Reminiscent of the Late 19th Century! Enjoy a romantic evening with your loved one under the glow of our 7' high solar powered traditional styled lamp posts. They come with 3 lights which use a special patented cone reflector to make the light brighter. This all aluminum construction tall lamp post will illuminate your garden with our energy efficient, super-bright LED's. The gas-light design of our solar lamp is classic and adds an elegant appeal to your front or back yard. Products Details: 90"" Height Elegant, energy-efficient way to light your way Automatically turn on and off Solar-powered batteries Beautiful beveled glass Durable, rust-resistant frame can be bolted down (bolts included) Special patented cone reflector to make the light brighter 8 super-bright LED bulbs are powered by the built-in Click on Image for Night Time View Specifications: Rechargeable batter Ni-Cd Voltage 4 x 1.2V AA Charging Charging Capacity 600mAh Lamp Type: Super Bright LED Mono Crystalli... [Read more]
Brand: Gamasonic
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Sunforce Solar Lamp Post Model# 84500
Stylish solar lamp post lets you light decks, gardens and pathways using only the power of the sun Application: Lamp post, Power Source: Solar, Includes (qty.): 1 Installs easily with included ground stakes [Read more]
Brand: Sunforce
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Allsop Solar-Powered Clear Globe Garden Art - - ALS29035
Superior Quality Solar Cell Keeps Product Lit For A Minimum Of 6-8 Hrs, [Read more]
Brand: Allsop
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Allsop Solar-Powered Garden Art - - ALS29032
Superior quality solar cell keeps product lit for a minimum of 6-8 hours., [Read more]
Brand: Allsop
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Allsop Solar-Powered Garden Art - - ALS29036
Superior quality solar cell keeps product lit for a minimum of 6-8 hours., [Read more]
Brand: Allsop
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Aurora Foldable Handheld Pocket Calculator, Solar/Battery, 8- - HC127
HC127 Foldable Handheld Pocket Calculator Angled Adjustable Display8-Digit, LCD Digit Size14mm Memory3-Key Battery/Solar Powered Size4-5/8w x 2-1/2d (folded) Operating Battery Included Replacement Battery ..., [Read more]
Brand: Aurora
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Brunton Solaris 12 watt Foldable Solar Array - F-SOLARIS12
Brunton Solaris 12 watt Foldable Solar Array - F-SOLARIS12, [Read more]
Brand: Brunton
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Brunton Solaris 26 watt Foldable Solar Array - F-SOLARIS26
Brunton Solaris 26 watt Foldable Solar Array - F-SOLARIS26, [Read more]
Brand: Brunton
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Brunton Solaris 6 watt Foldable Solar Array - F-SOLARIS6
Brunton Solaris 6 watt Foldable Solar Array - F-SOLARIS6, [Read more]
Brand: Brunton
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Canon 8-Digit Dual Power Solar Pocket Calculator - TS-82H
Canon 8-Digit Dual Power Solar Pocket Calculator - 8 Character(s) - LCD - Solar, Battery Powered - White, canon 8-digit dual power solar pocket calculator - 8 character(s) - lcd - solar, battery powered - 0.5" x 3.25" x 5.12" - white canon usa handheld hand held calculators pocket 8-digit dual power solar pocket simple calculator canon cnaon uas handehld hadn caclulators pockte 8-digti poewr pokcet cnaon portable port-able calculators handheld calculators portalbe potr-albe handheld caluclators canon, inc 1010068284 ts82h calculators 44101801 038569105454 206712534 cnmts82h cnm ts-82h cnmts82h cnmts-82h [Read more]
Brand: Canon
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Casio 8-Digit Solar Math Calculator - SL450
Casio 8-Digit Solar Math Calculator - 8 Character(s) - LCD - Solar Powered, [Read more]
Brand: Casio
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Casio Solar Scientific Calculator - FX-300ES
Casio Solar Scientific Calculator - 2 Line(s) x 10 Character(s) - Solar, casio solar scientific calculator - 2 line(s) - 10 character(s) - solar powered - gray graph graphics calculators graphing scientific calculators grapichs caclulators graphign scietnific calculatros casio computer co., ltd 10764634 fx300es calculators 44101801 079767171223 fx300es fx300es 203257912 csofx300es cso fx-300es csofx300es csofx300es [Read more]
Brand: Casio
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3-LINE SOLAR DESKTOP CALCULATOR WITH 12-DIGIT DISPLAY
12 DIGITS WITH LARGE, EASY-TO-READ DISPLAY & 3-DIGIT COMMA MARKERS; TIME, TAX & CHANGE CALCULATIONS; CURRENCY CONVERSION MODE; INDEPENDENT MEMORY & GRAND TOTAL KEY; DECIMAL SELECTOR 5/4 CUT OR FULL; PROFIT MARGIN; CHANGE SIGN ( /-); KEY ROLLOVER; AUTO POWER OFF AFTER 6 MIN; SOLAR PLUS POWER WITH BATTERY BACKUP SUBCATEGORY2: ERGONOMICS. Warranty: ONE YEAR. [Read more]
Brand: Casio
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Alpine Solar LED Torch Lantern With Glow In The Dark- Red
A Creative Addition to any Garden or Patio, this beautiful glass gazing globe is hand made with traditional blown glass. Gazing Globes are a great way to enhance your garden or patio area. These beautiful creations reflect the sun and surrounding light to create a dazzling focal point. [Read more]
Brand: Alpine
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Alpine Solar Light, Plastic Small Cup Height 13 Inch
Illuminate Your Outdoors with this Solar Powered LED garden light. It is fully automated, uses no electricity, has no wiring and installs by turning it on. Made of plastic, aluminum, and stainless steel, it will illuminate your driveway, sidewalks, or outdoor stairs. [Read more]
Brand: Alpine
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Alpine Solar Stake With 6 Inch Diameter Blue Glass Ball
A Creative Addition to any Garden or Patio, this beautiful glass gazing globe is hand made with traditional blown glass. Inside is a dark-blue swirl finish with a glow-in-the-dark streak of light blue and green. The luminescent crystals in the globe capture the essence of the night sky by absorbing the light of the sun during the day and emitting it in the evening in a warm, ambient glow for up to four hours. To recharge the globe, simply bring the unit indoors and put it under any incandescent light source for several minutes and then place it back outside. Gazing Globes are a great way to enhance your garden or patio area. These beautiful creations reflect the sun and surrounding light to create a dazzling focal point. [Read more]
Brand: Alpine
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Alpine Solar Stake With 6 Inch Diameter Green Glass Ball
A Creative Addition to any Garden or Patio, this beautiful glass gazing globe is hand made with traditional blown glass. Inside is a dark-blue swirl finish with a glow-in-the-dark streak of light blue and green. The luminescent crystals in the globe capture the essence of the night sky by absorbing the light of the sun during the day and emitting it in the evening in a warm, ambient glow for up to four hours. To recharge the globe, simply bring the unit indoors and put it under any incandescent light source for several minutes and then place it back outside. Gazing Globes are a great way to enhance your garden or patio area. These beautiful creations reflect the sun and surrounding light to create a dazzling focal point. [Read more]
Brand: Alpine
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Brunton Solarflat, 15-Solar Amorphous 15wt
Brunton is committed to bringing outdoor energy alternatives to the masses. For this reason we developed the SolarFlat rigid solar panel series. Mount a SolarFlat to the roof of your RV or camper and continuously charge your battery every day, or charge your boat battery while you re out on the water. The weatherproof SolarFlat does not require bright light to function properly. Instead, low-light, overcast days can still provide lots of power. Features: - Amorphous solar cells for high-low light performance - Weatherproof - Reverse flow protection - Durable aluminum frame - Link multiple like-units together for more output - Use up to five together with SolarController for perfect charge control - Includes: 10 ft. Cable, vehicle cable, battery clamps, link adapter cable (SF 15) Specifications: - Dimensions - 14 inchx48 inchx0. 75 inch - Weight - 10 lbs 2 oz - Panel type - Amorphous - Ouput - 12V - Power/current - 15 watts 1000mA [Read more]
Brand: Brunton
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Brunton Solarflat, 2-Solar Amorphous 2 Watt
Brunton is committed to bringing outdoor energy alternatives to the masses. For this reason we developed the SolarFlat rigid solar panel series. Mount a SolarFlat to the roof of your RV or camper and continuously charge your battery every day, or charge your boat battery while you re out on the water. The weatherproof SolarFlat does not require bright light to function properly. Instead, low-light, overcast days can still provide lots of power. Features: - Amorphous solar cells for high-low light performance - Weatherproof - Reverse flow protection - Durable aluminum frame - Link multiple like-units together for more output - Use up to five together with SolarController for perfect charge control - Includes: 10 ft. Cable, vehicle cable, battery clamps, link adapter cable (SF 15) Specifications: - Dimensions - 7 inchx12 inchx0. 75 inch - Weight - 1 lb 14. 8 oz - Panel type - Amorphous - Output - 12V or 24V Power/current - 2 watts 140 mA [Read more]
Brand: Brunton
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Brunton Solarroll 9, 9 Watt Flexible Solar Module
Brunton s drive and desire to pioneer a line of rugged power sources led to the introduction of the first flexible solar panel, the SolarRoll. Since then, the evolution of this concept has flourished. Backed by glowing reviews in every major magazine and newspaper in this country and others, the SolarRoll has officially taken its place as one of Brunton s most talked about products. The proof, though, is in the remarkable performance. The waterproof SolarRoll has given sea kayakers the power to photograph their voyages from the far reaches of the planet. And next spring, it will assist Ed Viesturs in his final summit, Annapurna, as he polishes off the last peak of Endeavor 8000. Ideal for powering satellite phones, members of expeditions worldwide pack the SolarRoll in place of expensive extra batteries that don t offer much relief in the form of weight. Brunton realizes however, that not everyone is defying the ordinary. Some of us simply need the SolarRoll for charging our car bat... [Read more]
Brand: Brunton
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Bushnell Trail Scout Pro Solar Panel
The Bushnell Trail Scout Pro Solar Panel Accessory extend the battery life of a Trail Scout Pro camera indefinitely, for extremely long observation periods. Just mount it in a sunny location and connect to your Trail Scout Pro camera. Features: - Extend Battery Life Indefinitely - Easy to Mount Specifications: - Solar-Powered [Read more]
Brand: Bushnell
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Casio G-Shock Solar Powered Atomic Watch
Solar Powered Atomic Timekeeping (Automatic Receive 4x per day or manually) Shock Resistant 200M Water Resistant Auto EL Backlight World Time (30 Cities) 5 Alarms & 1 Snooze Alarm 1/100 Second Stopwatch (Elapsed Time - Split Time & Two Finish Times) Time Recorder (30 Records) Weight: 1. Average Freight: 6. 64. [Read more]
Brand: Casio
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Casio G-Shock Solar Powered Atomic Watch
Solar Powered Atomic Timekeeping (Automatic Receive 4x per day or manually) Shock Resistant 200M Water Resistant Auto EL Backlight World Time (30 Cities) 5 Alarms & 1 Snooze Alarm 1/100 Second Stopwatch (Elapsed Time - Split Time & Two Finish Times) Time Recorder (30 Records) Weight: 1. Average Freight: 6. 20. [Read more]
Brand: Casio
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COMPACT DESKTOP SOLAR CALCULATOR
12-DIGIT, ANGLED DISPLAY; LAST-DIGIT ERASE; FULL DECIMAL SYSTEM, FLOATING, ROUND UP/OFF OR CUTOFF; FULL-FUNCTION MEMORY; GRAND TOTAL & MARKUP KEYS; PERCENT & SQUARE ROOT KEYS SUBCATEGORY2: ERGONOMICS. Warranty: NINETY DAYS. [Read more]
Brand: Royal
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Fire Magic Gas Grills Echelon E1060i All Infrared Natural Gas Built-In Grill With Solar Panel & Magic View Window
This Fire Magic Echelon Gas Grill features sleek styling with seamless control panel, double-walled tear-drop hood with warming rack, 110v hard wired electrical supply which powers the 12 volt electric hot surface ignition system with flash tubes, angled halogen internal oven lamps, and 4-zone backlit digital meat and grill thermometer in control panel. Unique solar panel powers internal lights, rotisserie motor and ignition. Features Magic View Window allowing you to view your food without lifting the lid and losing valuable heat. Also features a wood chip smoker drawer with dedicated burner, heat zone separators, feather lite easy lift hood, stainless valve manifold, polished Comfort Touch control knobs, disposable foil drip tray liners and water and rain resistant construction. Comes ready to be built in to your island opening. 4 Infrared Burners. 1056 square inches of cooking surface (48 x 22 main grilling area). Includes (2) 15, 000 BTU back burners and rotis kit. Island cut-ou... [Read more]
Brand: Fire Magic
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Fire Magic Gas Grills Echelon E1060s All Infrared Propane Gas Grill With Solar Panel, Single Side Burner & Magic View Window On Cart
This Fire Magic Echelon Gas Grill features sleek styling with seamless control panel, double-walled tear-drop hood with warming rack, 110v hard wired electrical supply which powers the 12 volt electric hot surface ignition system with flash tubes, angled halogen internal oven lamps, and 4-zone backlit digital meat and grill thermometer in control panel. Unique solar panel powers internal lights, rotisserie motor and ignition. Features Magic View Window allowing you to view your food without lifting the lid and losing valuable heat. Also features a wood chip smoker drawer with dedicated burner, heat zone separators, feather lite easy lift hood, stainless valve manifold, polished Comfort Touch control knobs, disposable foil drip tray liners and water and rain resistant construction. Includes pre-assembled all stainless cabinet cart with dual storage doors inside shelves, condiment holders, sliding propane cylinder tray with latch and four lockable swivel casters. Also includes 110v po... [Read more]
Brand: Fire Magic
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Fire Magic Gas Grills Echelon E660i All Infrared Propane Gas Built-In Grill With Solar Panel
This Fire Magic Echelon Gas Grill features sleek styling with seamless control panel, double-walled tear-drop hood with warming rack, 110v hard wired electrical supply which powers the 12 volt electric hot surface ignition system with flash tubes, angled halogen internal oven lamps, and 4-zone backlit digital meat and grill thermometer in control panel. Unique solar panel powers internal lights, rotisserie motor and ignition. Also features a wood chip smoker drawer with dedicated burner, heat zone separators, feather lite easy lift hood, stainless valve manifold, polished Comfort Touch control knobs, disposable foil drip tray liners and water and rain resistant construction. Comes ready to be built in to your island opening. 3 Infrared Burners. 660 square inches of cooking surface (30 x 22 main grilling area). Includes 19, 000 BTU back burner and rotis kit. Island cut-out dimensions: 31. 25 width x 23. 5 depth x 12 height. No hose and/or regulator assembly included. [Read more]
Brand: Fire Magic
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Fire Magic Gas Grills Echelon E660i Natural Gas Built-In Grill With Solar Panel And Magic View Window
This Fire Magic Echelon Gas Grill features sleek styling with seamless control panel, double-walled tear-drop hood with warming rack, 110v hard wired electrical supply which powers the 12 volt electric hot surface ignition system with flash tubes, angled halogen internal oven lamps, and 4-zone backlit digital meat and grill thermometer in control panel. Features Magic View Window allowing you to view your food without lifting the lid and losing valuable heat. Unique solar panel powers internal lights, rotisserie motor and ignition. Also features a wood chip smoker drawer with dedicated burner, heat zone separators, feather lite easy lift hood, industry exclusive cast stainless E burners, stainless rod cooking grids, stainless valve manifold, polished Comfort Touch control knobs, disposable foil drip tray liners and water and rain resistant construction. Comes ready to be built in to your island opening. 3 main burners producing 78, 000 BTU. 660 square inches of cooking surface (30 x... [Read more]
Brand: Fire Magic
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Fire Magic Gas Grills Echelon E660i Propane Gas Built-In Grill With Solar Panel And Magic View Window
This Fire Magic Echelon Gas Grill features sleek styling with seamless control panel, double-walled tear-drop hood with warming rack, 110v hard wired electrical supply which powers the 12 volt electric hot surface ignition system with flash tubes, angled halogen internal oven lamps, and 4-zone backlit digital meat and grill thermometer in control panel. Features Magic View Window allowing you to view your food without lifting the lid and losing valuable heat. Unique solar panel powers internal lights, rotisserie motor and ignition. Also features a wood chip smoker drawer with dedicated burner, heat zone separators, feather lite easy lift hood, industry exclusive cast stainless E burners, stainless rod cooking grids, stainless valve manifold, polished Comfort Touch control knobs, disposable foil drip tray liners and water and rain resistant construction. Comes ready to be built in to your island opening. 3 main burners producing 78, 000 BTU. 660 square inches of cooking surface (30 x... [Read more]
Brand: Fire Magic
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Fire Magic Gas Grills Echelon E790s Natural Gas Grill With Solar Panel & Single Side Burner On Cart
This Fire Magic Echelon Gas Grill features sleek styling with seamless control panel, double-walled tear-drop hood with warming rack, 110v hard wired electrical supply which powers the 12 volt electric hot surface ignition system with flash tubes, angled halogen internal oven lamps, and 4-zone backlit digital meat and grill thermometer in control panel. Unique solar panel powers internal lights, rotisserie motor and ignition. This Fire Magic Echelon BBQ Gas Grill also features a wood chip smoker drawer with dedicated burner, heat zone separators, feather lite easy lift hood, industry exclusive cast stainless E burners, stainless rod cooking grids, stainless valve manifold, polished Comfort Touch control knobs, disposable foil drip tray liners and water and rain resistant construction. Includes pre-assembled all stainless cabinet cart with dual storage doors inside shelves, condiment holders, sliding propane cylinder tray with latch and four lockable swivel casters. Also includes 110... [Read more]
Brand: Fire Magic
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Brunton Solaris 6 - solar charger
CHARGER, SOLARIS 6WATT, FOLDABLE [Read more]
Brand: Brunton
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Brunton Solaris i6 Foldable - solar charger
SOLAR CHARGER, F-SOLARISi6, IPOD [Read more]
Brand: Brunton
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Brunton SolarRoll 9 - solar charger - 9 Watt
Solar Charger Cell Phone MP3 Player iPod Smart Phone GPS Navigator Digital Camera Portable Game Player Two Way Radio AA Battery Charger Satellite Phone Video Camera Portable DVD Player Power Tool Charger Laptop Electric Fence Battery Radio Tuner Air Pump Portable Fan Automobile Battery Brunton Products: Solo 3.4 Solo 7.5 Solo 15 12"" Height x 40"" Width - open F-SOLARROLL9 Brunton drive and desire to pioneer a line of rugged power sources led to the introduction of the first flexible solar panel, the SolarRoll 9 Solar Charger. Since then, the evolution of this concept has flourished. Backed by glowing reviews in every major magazine and newspaper in this country and others, the SolarRoll has officially taken its place as one of most talked about products. 9 W 1 Year 15.4 V DC 10.60 oz Brunton, Inc SolarRoll 9 Solar Charger Brunton 600 mA [Read more]
Brand: Brunton
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Brunton SolarRoll 4.5 - solar charger
CHARGER, SOLARIS 4.5WATT, FLEXIBLE [Read more]
Brand: Brunton
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Brunton SolarRoll 14 - solar charger - 14 Watt
CHARGER, SOLARIS 14WATT, FLEXIBLE [Read more]
Brand: Brunton
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Calculator, Scientific, Solar
The fx-260 scientific calculator features 144 built-in functions, 10-digit display with 2-digit exponent, backspace key to fix entry mistakes and fraction functions. Calculator is also capable of basic scientific, exponential and trigonometric functions, and single-variable statistical calculations. Solar powered. Slide-on case is included. [Read more]
Brand: Casio
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Arch Tabletop Solar Lantern with Frosted Glass, Set of Two
-Powder coated in weathered brown -Die cast aluminum construction -Candle light LED Six glass panels -On off switch -Includes 2AA 1.2V rechargeable batteries. [Read more]
Brand: Starlite Garden & Patio Torche
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Black 3.5-Foot Solar LED Single-Lantern Outdoor Post Light
Illuminate or line your walkway with our 3.5? energy efficient, super-bright low lamp post. The LED lights use a special patented cone reflector to make the light brighter in each of our solar lamp posts. The gas-light design of our solar lamp lights is classic and adds an elegant appeal to your front or back yard. Using efficient solar-powered technology, the solar lamp lights receive their energy from built-in batteries charged daily by the sun, which in turn light the 8 super-bright LED bulbs. Each solar lamp post has real beveled glass panes that add to the late 19th Century appeal. No maintenance is required with the powder-coated cast-aluminum solar lamp posts that are weather resistant won?t rust. Worry-free, the solar lamp post turns on automatically at dusk and off at dawn. There is also a manual on/off switch for your convenience. The solar lamp post can be bolted down (bolts included). -Rechargeable battery: Ni-Cd -Voltage: 4 x 1.2V AA -Charging Capacity: 600mAh -Lamp typ... [Read more]
Brand: Gama Sonic
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Exploring Our Solar System - Hand Autographed by Sally Ride
Exploring Our Solar System - Hand Autographed by Sally Rideby Sally Ride and Tam O'ShaughnessyExploring Our Solar System is the latest book by the awarding-winning team of Sally Ride and Tam O'Shaughnessy. The mysteries of space are endless, but some of the most extraordinary places in the universe can be found right in our own solar system. In this book, you'll take a thrilling tour of our solar system, starting with the birth of our Sun. From the four terrestrial planets-with a special stop at our unique, life-supporting Earth-through the Asteroid Belt to the four giant planets, tiny Pluto, and beyond. With the latest research from telescopes and spacecraft and over 120 stunning photographs and helpful diagrams, this is the definitive guide to our solar system.NSTA/CBC Outstanding Science Trade Book for ChildrenFeatures:Hand Autographed by Sally Ride For readers ages 9 and up Hardcover8 3/4x 11 5/8 110 pages [Read more]
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Our Solar System
The full-color photographs and illustrations are spectacular. Each of the planets gets several pages of coverage, with comets, meteors, and asteroids also receiving attention. This book serves best as an introduction to the single topic books since the information presented here is quite brief. The endpapers have a nicely organized chart of useful statistics such as diameter, rotation period, revolution period, etc., for each planet. Not sufficient in itself for most report needs, this title's eye-catching illustrations and understandable text should encourage young readers to look for further information. Hardcover, 64 pages. Grades 3-6. [Read more]
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Our Amazing Solar System
The Grand TourFeaturing the amazing picture and sound quality that only DVD can offer, this fully-narrated video reveals new worlds beyond our imagination. This is the epic adventure, as never before presented, a captivating program featuring the latest and best visuals from the golden age of space exploration.An Epic AdventureWith supercomputer visualizations, you will soar over the volcano-scarred landscape of Venus and journey to the Grand Canyon of Mars. Experience the eerie majesty of the giant outer planets and their amazing moons, unique gems in this wondrous solar system we call home. From comets to solar flares, from the scorched surface of Mercury to the frozen outer worlds of Neptune and Triton, this is the complete video saga of our amazing solar system.Special Features:Incredible Digital Picture and Sound Interactive Menus Chapter Search Bonus Video - On Robot Wings - flying by the planets! Screen Saver for your PC or Mac computer Internet Resources DVD 90 minutes. Colo... [Read more]
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Our Solar System Place Mat
Our Solar System Place MatBeautifully-illustrated, educational placemat brings an added dimension to mealtime. Borders are filled facts, and information. Made of durable polypropylene and are PVC free, the 11"" x 17"" placemat easily wipes clean after every meal. Conforms to both U.S. and European safety standards. Ages 1 to 8 [Read more]
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Planetology: Unlocking the Secrets of the Solar System (Hardcover)
Planetology: Unlocking the Secrets of the Solar System (Hardcover)Noted planetary geologist Ellen Stofan and veteran astronaut Tom Jones pair images of Earthmany captured by space shuttle and space station crewmemberswith astonishing scenes of alien surfaces beamed home by NASAs far-ranging robotic probes. Vivid illustrations of searing lava plains, windswept deserts, and stark craters demonstrate how natural forces have shaped these varied landscapes. This comprehensive new portrait of the solar system brings to light an array of important features never seen until todayand it highlights, for the first time, the similarities and contrasts between Earth and its neighbors in space.In a stunning and completely new view of the solar system, an astronaut and a geologist team up to investigate, through parallel views made possible by cutting-edge space technology, how the earth itself can help science unravel the mysteries of the heavens.Anecdotal stories from space flights and explorato... [Read more]
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Mirage Hanging Solar Light, Set of Two
Mirage Series rechargeable hanging garden lights. New LED technology for extra long run times. Aluminum hanging hook is adjustable. [Read more]
Brand: Brinkmann
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Emperor Solar Light Set, Set of Four
Black finish with frosted lens. Includes ground stake and deck/wall mounting bracket. No wiring is required. Assembles and installs in seconds. At night, the light turns on automatically. Four Light Set. [Read more]
Brand: Brinkmann
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Kettle Lantern Solar Accent Lights, Set of Four
These beautifully designed, solar garden accent lights feature the L.E.D. technology for extra-long run times and special internal reflectors to enhance and distribute light evenly. No wiring is required - they assemble and install in seconds! The solar panel converts sunlight into electricity and charges the rechargeable battery during the day. At night, the light turns on automatically. Steel finish with frosted bubble glass lens. 4 light set. [Read more]
Brand: Brinkmann
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Moderna Solar Light, Set of Four
These beautifully designed, solar garden accent lights feature the L.E.D. technology for extra-long run times and special internal reflectors to enhance and distribute light evenly. No wiring is required - they assemble and install in seconds! The solar panel converts sunlight into electricity and charges the rechargeable battery during the day. At night, the light turns on automatically. Verde finish with frosted lens. [Read more]
Brand: Brinkmann
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Kettle Lantern Solar Light, Set of Two
These beautifully designed, solar garden accent lights feature the L.E.D. technology for extra-long run times and special internal reflectors to enhance and distribute light evenly. No wiring is required - they assemble and install in seconds! The solar panel converts sunlight into electricity and charges the rechargeable battery during the day. At night, the light turns on automatically. Steel finish with frosted bubble glass lens. 2 light set. [Read more]
Brand: Brinkmann
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Emperor Solar Light, Set of Two
Black finish with frosted lens. Includes ground stake and deck/wall mounting bracket. No wiring is required. Assembles and installs in seconds. At night, the light turns on automatically. Two Light Set. [Read more]
Brand: Brinkmann
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SOLAR-POWERED ;CALLA LILY GARDEN ART
SOLAR-POWERED GARDEN ACCENT LIGHT & PLANT STAKE; HIGH-POWERED AMBER LED LASTS OVER 100, 000 HOURS; SUPERIOR QUALITY SOLAR CELL KEEPS PRODUCT LIT FOR A ;MINIMUM OF 6 8 HOURS; HAND-BLOWN CRACKED GLASS; INTERCHANGEABLE TOPS; DETACHABLE BOTTOM STAKE ;& TIP ALLOW FOR 2 ;DIFFERENT STAKE HEIGHTS SUBCATEGORY2: YARD TOOLS. Warranty: LIMITED LIFETIME. [Read more]
Brand: Allsop
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SOLAR BATTERY CHARGER (20-WATT)
SOLAR BATTERY CHARGER FOR 12V BATTERIES; SEMI-FLEXIBLE, DURABLE & ALL-WEATHER DESIGN; HIGH-EFFICIENCY POLYCRYSTALINE CELLS; LIGHTWEIGHT, RUGGED & COMPACT; EASY CONNECTION WITH UTILITY ADAPTER; SELF REGULATING; 20W SUBCATEGORY2: SOLAR CHARGERS. Warranty: FIVE YEARS. [Read more]
Brand: Gopower
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Black Solar LED Outdoor Wall Light
This beautiful wall fitting solar light comes ready to install to add a great feature to your home. It uses a special patented cone reflector to make the light brighter. This all alluminium construction wall light will illuminate your garden with our energy efficient, super-bright LEDs. The gas-light design of our solar lamp is classic and adds an elegant appeal to your front or back yard. Using efficient solar-powered technology, the solar lamp lights receive their energy from built-in batteries charged daily by the sun, which in turn light the 8 super-bright LED bulbs. Each solar lamp post has real beveled glass panes that add to the late 19th Century appeal. No maintenance is required with the powder-coated cast-aluminum solar lamp posts that are weather resistant and won?t rust. Worry-free, the solar lamp turns on automatically at dusk and off at dawn. There is also a manual on/off switch for your convenience. -Rechargeable battery: Ni-Cd -Voltage: 4 x 1.2V AA -Charging Capacity... [Read more]
Brand: Gama Sonic
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Moderna Solar Light, Set of Two
Black finish with Frosted lens. Includes Ground Stake. No wiring is required. Assembles and installs in seconds. At night, the light turns on automatically. Two Light Set. [Read more]
Brand: Brinkmann
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FOLDING SOLAR CALCULATOR
12-DIGIT, EXTRA-LARGE DISPLAY; COMPACT CASE WITH 1-TOUCH OPENING; LAST-DIGIT ERASE; FULL DECIMAL SYSTEM, FLOATING, ROUND UP/OFF OR CUTOFF; FULL-FUNCTION MEMORY; GRAND TOTAL & MARKUP KEYS; PERCENT & SQUARE ROOT KEYS SUBCATEGORY2: ERGONOMICS. Warranty: NINETY DAYS. [Read more]
Brand: Royal
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Solar System Planetarium Model
Creative fun for the young AND the young at heart!Assemble and paint your own planetarium model. You can even highlight your solar system model with the glow paint provided. Charge it with any light source, turn the light off, and it will glow like magic!This inspiring science craft contains:- 1 set of 3-dimensional Solar System planetarium model- 1 brush - 1 stripe of paint pots and glow paint- 1 set stand and rotating arms- 9 steel bars - 1 sand paper- 1 Saturn ring template- Detailed instructions- Bonus wall chart of Solar SystemRecommended for ages 7+ [Read more]
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Solar System Light Up Mobile
The perfect centerpiece for the space-theme room! A remote controlled solar system including motorized planets and a light up Sun. Now you can explore the wonders of the solar system right in your own room! Just look up at your ceiling and watch as all nine planets orbit around the light-up sun. Listen as the audio CD (see inset photo) takes you on a fascinating tour of our solar system. Use the included light-pointer to locate each planet and make comets and meteors streak through the night sky. Realistic, colorful planets rotate around the sun Sun lights up with a push of a button Mounts easily to any HORIZONTAL ceiling Does NOT need an existing light fixture Infrared remote control Light pointer Automatic shut-off after 20 minutes 42 inches in diameter CD with 15-minute guided audio tour included Comes with set of glow-in-the-dark star stickers * Batteries not included. Requires 3 ""C"" batteries and 2 ""AAA"" batteries [Read more]
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Emerging solar technologies
There are several technologies being developed that bypass mirrors and collectors to capture the sun. Solar paints contain conductive polymers, extremely small semiconducting wires, or quantum dots. Such paints could be used to coat any surface and turn it into an electrical generator. Other companies are working on similar technologies for plastics. Rolls of plastic are coated with an electricity-generating film. The plastic could be spread over roofs or other surfaces to convert sunlight into electricity.
The use of solar energy to cool homes and buildings is another area under more development. Such systems use solar panels to produce electricity. These panels power a pump connected to an absorber machine. This machine works something like a refrigerator.
The absorber employs hot air to compress a gas. When this gas expands, it causes a reaction that cools the air. Solar thermal coolers are expected to reach the commercial market in the early twenty-first century.
Many new solar technologies are still in the experimental stage. One possibility is solar-powered air flights. Another is a different kind of solar lighting, in which a building's interior is lit by a parabolic collector on the roof. This collector is connected to the interior by fiber optic light pipes. Such a system would make its own electricity to power the lights.
Benefits and drawbacks to solar energy
One of the primary benefits to solar energy is that it is a renewable resource. Sunshine is available everywhere free. There is no limit to its renewability, at least not until the sun burns itself out billions of years from now. Solar energy also does not contribute to pollution and thus is considered a ''clean'' energy source. Using it produces no greenhouse gases and thus does not contribute to global warming.
The biggest drawback to using solar energy is the cost of the technology. Solar photovoltaic cells and solar collectors are still very expensive. While the technology may become cheaper over time, it is still costly when compared to the amount of energy it will produce over its use cycle. Similarly, it is very expensive to build solar power towers and furnaces. Using such technology to generate power on a wide scale is too expensive to be used realistically, at least as of the early twenty-first century.
Another major problem with solar technology is that solar energy is not available on demand in every location on Earth.
Heavy cloud cover can limit the use of some solar energy systems. Some systems cannot be used at all if direct sunlight is not available. In most areas of the world, only low-power solar energy applications can be used because of the lack of direct sunlight.
For large-scale projects such as solar power towers and solar furnaces, or even smaller-scale projects such as solar ponds, dish systems, and trough systems, large areas of land are needed. In the desert, where a number of these systems are currently located, the solar technology that is put there to capture the intense sunshine is considered unsightly by some people.
Environmental impact of solar energy
Solar energy can have both positive and negative effects on the environment. On the positive side, most solar technologies are environmentally friendly. They do not pollute the atmosphere by emitting (giving off) greenhouse gases, they do not produce radioactive waste like nuclear energy reactors, and they do not contribute to global warming or acid rain. Most solar energy systems are silent or quiet when they operate, which cuts down on noise pollution. If solar technologies that make electricity on a significant scale can be adopted, many countries can lessen their dependence on electricity produced by fossil fuels. This change could decrease the amount of environmental pollution in the world.
However, solar energy technologies are not perfect. In addition to large-scale projects negatively affecting the landscape, these solar technologies can negatively affect the animal life around them. Big dish systems, trough systems, and power towers take up land that animals live on and affect their habitats. The very building of these projects can pollute otherwise pristine (clean) lands, even if the solar technology itself does not. Also, while the use of solar technology does not pollute the environment, the manufacture of certain types of solar technology can.
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Tecnologías solares emergentes
Hay varias tecnologías que están siendo desarrolladas que no recurren a los espejos y los colectores para capturar el sol. Las pinturas solares contienen polímeros conductores, los alambres semiconductores extremadamente pequeños, o los puntos de quántum. Tales pinturas se podrían utilizar para cubrir cualquier superficie y transformarla en un generador eléctrico. Otras compañías están trabajando en tecnologías similares para los plásticos. Rollos de plástico son cubiertos con una película generadora de electricidad. El plástico podría ser extendido por azoteas u otras superficies para convertir luz del sol en electricidad.
El uso de la energía solar para refrigerar hogares y edificios es también otra área en desarrollo. Tales sistemas utilizan paneles solares para producir electricidad. Los estos paneles accionan una bomba conectada con una máquina de absorción. Esta máquina funciona un poco como un refrigerador.
El producto absorbente emplea el aire caliente para comprimir un gas. Cuando este gas se expande, causa una reacción que refresca el aire. Se espera que los refrigeradores térmicos solares alcancen el mercado comercial éste siglo.
Muchas tecnologías solares nuevas todavía están en la etapa experimental. Una posibilidad es de vuelos aéreos con impulsión solar. Otra es una variante de iluminación solar, en la cual el interior de un edificio es iluminado por un colector parabólico en la azotea. Este colector es conectado con el interior por cañerías de fibra óptica ligeras. Tal sistema crearía su propia electricidad para encender las luces.
Ventajas y desventajas a la energía solar
Una de las ventajas primarias a la energía solar es que es un recurso renovable. La luz del sol está disponible por todas partes libremente. No hay límite a su renovabilidad, por lo menos hasta que el sol se apague en unos mil millones de años de ahora en adelante. La energía solar tampoco contribuye a la contaminación y así se la considera una fuente de energía "limpia". Su uso no produce ningún gas de efecto invernadero y no contribuye así al calentamiento del planeta.
La desventaja más grande de usar energía solar es el coste de la tecnología. Las células fotovoltaicas solares y los colectores solares siguen siendo muy costosos. Mientras que la tecnología pueda llegar a ser más barata en un cierto plazo, es todavía costosa al ser comparada con la cantidad de energía que se produciría sobre su ciclo del uso. Similarmente, es muy costoso construir torres y hornos de energía solar. El uso de tal tecnología para generar energía a gran escala es demasiado costosa para ser utilizada en forma realista, por lo menos hasta la fecha en éste siglo.
Otro problema grave con tecnología solar es que la energía solar no está disponible a pedido en cada localización en la tierra.
Una gruesa cubierta de nubes puede limitar el uso de algunos sistemas de energía solar. Algunos sistemas no se pueden utilizar en absoluto si la luz del sol directa no está disponible. En la mayoría de las áreas del mundo, solamente los usos de energía solar de baja potencia se pueden utilizar debido a la carencia de la luz del sol directa.
Para los proyectos en gran escala tales como torres de energía solar y hornos solares, o aún en proyectos menor escala tales como estanques solares, sistemas de plato, y sistemas concentradores solares, áreas extensas de tierra son necesarias. En el desierto, en donde un número apreciable de estos sistemas se localizan actualmente, la tecnología solar que se instala allí para capturar la luz de sol intensa es considerada antiestética por alguna gente.
Consecuencias para el medio ambiente de la energía solar
La energía solar puede tener efectos positivos y negativos sobre el medio ambiente. En el lado positivo, la mayoría de las tecnologías solares son respetuosas del medio ambiente. No contaminan la atmósfera emitiendo los gases de efecto invernadero, no producen desechos radioactivos como los reactores de energía nuclear, y no contribuyen al calentamiento del planeta o a la lluvia ácida. La mayoría de los sistemas de energía solar son silenciosos o estables cuando funcionan, lo que reduce la contaminación por ruido. Si las tecnologías solares que generan electricidad en una escala significativa pueden ser adoptadas, muchos países podrían disminuir su dependencia de la electricidad producida por los combustibles fósiles. Este cambio podría disminuir la cantidad de contaminación ambiental en el mundo.
Sin embargo, las tecnologías de energía solar no son perfectas. Además de los proyectos en gran escala que afectan negativamente al paisaje, estas tecnologías solares pueden afectar negativamente a la vida animal alrededor de ellos. Los sistemas grandes de plato, los sistemas concentradores convexos, y las torres de energía ocupan la tierra en donde los animales viven y afectan a su hábitat. La construcción misma de estos proyectos puede contaminar tierras de otra manera prístinas (limpias), incluso si no lo hace la tecnología solar por sí misma. También, mientras que el uso de la tecnología solar no contamina el ambiente, la fabricación de ciertos tipos de tecnología solar lo puede hacer. |
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