Outline of solar energy


The following outline is provided as an overview of and topical guide to solar energy:
Solar energy is radiant light and heat from the Sun. It has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar energy technologies include solar heating, solar photovoltaics, solar thermal electricity and solar architecture. These can make considerable contributions to solving some of the most urgent problems that the world now faces.

Overview

Solar energy can be described as all of the following:
  • Energy – an indirectly observed quantity, often understood as the ability a physical system has to do work on other physical systems.
  • * Renewable energy – energy which comes from natural resources which are naturally replenished.
  • Natural resource – materials and components that can be found within the environment. Every man-made product is composed of natural resources. A natural resource may exist as a separate entity such as fresh water, and air, as well as a living organism such as a fish, or it may exist in an alternate form which must be processed to obtain the resource such as metal ores, oil, and most forms of energy.
  • * Renewable resource – natural resource with the ability to reproduce through biological or natural processes and are replenished with the passage of time.

Sunlight

  • Sun – the star at the center of the Solar System
  • Sunlight – in the broad sense, is the total frequency spectrum of electromagnetic radiation given off by the Sun, particularly infrared, visible, and ultraviolet light.

History of solar energy

Conversion of solar energy

Solar power – the conversion of sunlight into electricity, either directly using photovoltaics, or indirectly using concentrated solar power.
  • Active solar – technologies are employed to convert solar energy into another more useful form of energy.
  • Heliostat – a device that includes a mirror, usually a plane mirror, which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the Sun's apparent motions in the sky.
  • Solar tracker – devices that orient various payloads toward the Sun.
  • Role of copper in generating and transmitting energy with maximum efficiency in solar photovoltaic power generation, concentrating solar thermal power, and solar water heaters.
  • Solar cell efficiency
  • Solar cell – made from a monocrystalline silicon wafer
  • Solar chemical – a number of possible processes that harness solar energy by absorbing sunlight in a chemical reaction in a way similar to photosynthesis in plants but without using living organisms.
  • Solar constant – a measure of flux density, it is the amount of incoming solar electromagnetic radiation per unit area that would be incident on a plane perpendicular to the rays, at a distance of one astronomical unit .
  • Solar inverter – or PV inverter, converts the variable direct current output of a photovoltaic solar panel into a utility frequency alternating current that can be fed into a commercial electrical grid or used by a local, off-grid electrical network.
  • Solar photovoltaics

Solar thermal energy

Solar thermal energy – technology for harnessing solar energy for thermal energy.
  • Solar district heating and solar district cooling. See: Seasonal thermal energy storage.
  • Solar water heating – or solar hot water systems comprise several innovations and many mature renewable energy technologies that have been well established for many years.
  • Solar air conditioning – any air conditioning system that uses solar power.
  • Thermal mass – a concept in building design regarding how the mass of the building provides "inertia" against temperature fluctuations, sometimes known as the thermal flywheel effect.
  • Solar pond – a pool of saltwater which acts as a large-scale solar thermal energy collector with integral heat storage for supplying thermal energy.
  • Solar chimney – solar chimney – often referred to as a thermal chimney – is a way of improving the natural ventilation of buildings by using convection of air heated by passive solar energy.

Concentrated solar power

Concentrated solar power – a system that uses mirrors or lenses to concentrate a large area of sunlight, or solar thermal energy, onto a small area. Electrical power is produced when the concentrated light is converted to heat, which drives a heat engine connected to an electrical power generator.

Photovoltaics

Photovoltaics
  • Photoelectric effect – electrons are emitted from matter as a consequence of their absorption of energy from electromagnetic radiation of very short wavelength, such as visible or ultraviolet radiation.
  • Photovoltaics – is a method of generating electrical power by converting solar radiation into direct current electricity using semiconductors that exhibit the photovoltaic effect.
  • Growth of photovoltaics – showing the history of installed photovoltaics.
  • Timeline of solar cells – begins in the 19th century when it is observed that the presence of sunlight is capable of generating usable electrical energy.
  • Solar insolation – a measure of solar radiation energy received on a given surface area and recorded during a given time. It is also called solar irradiation. Not to be confused with insulation.
  • Solar constant – a measure of flux density, is the amount of incoming solar electromagnetic radiation per unit area that would be incident on a plane perpendicular to the rays, at a distance of one astronomical unit|astronomical unit .
  • Solar cell efficiency – the percentage of the solar energy to which the cell is exposed that is converted into electrical energy. Also referred to as "energy conversion efficiency".
  • Third generation photovoltaic cell – are solar cells that are potentially able to overcome the Shockley-Queisser limit of 31-41% power efficiency for single bandgap solar cells.
  • Solar cell research – in universities and research institutions around the world.
  • Quantum efficiency of a solar cell
  • Cadmium telluride – a crystalline compound formed from cadmium and tellurium, used as an infrared optical window and a solar cell material.
  • Thermophotovoltaic – energy conversion is a direct conversion process from heat differentials to electricity via photons.
  • Polycrystalline silicon photovoltaics – are a type of solar cell.
  • Thermodynamic efficiency limit – the absolute maximum theoretically possible conversion efficiency of sunlight to electricity.
  • Sun-free photovoltaics
  • Polarizing organic photovoltaics – is a concept for harvesting energy from Liquid crystal display screens, developed by engineers from UCLA.
  • Solar cell – made from a monocrystalline silicon wafer.
  • Polymer solar cell – are a type of flexible solar cell.
  • Nanocrystal solar cell – are solar cells based on a substrate with a coating of nanocrystals.
  • Solar panel – is a packaged, connected assembly of photovoltaic cells.
  • Photovoltaic system – use solar panels to convert sunlight into electricity.
  • Photovoltaic power station – also known as a solar park or solar farm, is a large-scale photovoltaic system designed for the supply of merchant power into the electricity grid.

Photovoltaic system

Photovoltaic system
Solar cells

Photovoltaic power stations

Photovoltaic power station

Experimental proposed solar power

  • Solar updraft tower – a renewable-energy power plant for generating electricity from solar power.
  • Solar-pumped laser – laser that shares the same optical properties as conventional lasers such as emitting a beam consisting of coherent electromagnetic radiation which can reach high power, but which uses solar radiation for pumping the lasing medium. This type of laser is unique from other types in that it does not require any artificial energy source.
  • Thermoelectric generator – are devices which convert heat directly into electrical energy, using a phenomenon called the "Seebeck effect".
  • Solar chemical – a number of possible processes that harness solar energy by absorbing sunlight in a chemical reaction in a way similar to photosynthesis in plants but without using living organisms.
  • Space-based solar power – : Part of the solar energy is lost on its way through the atmosphere by the effects of reflection and absorption.
  • Solar sail – are a form of spacecraft propulsion using the radiation pressure of light from a star to push large ultra-thin mirrors to high speeds.
  • Magnetic sail – or magsail is a proposed method of spacecraft propulsion which would use a static magnetic field to deflect charged particles radiated by the Sun as a plasma wind, and thus impart momentum to accelerate the spacecraft.
  • Solar thermal rocket – a theoretical spacecraft propulsion system that would make use of solar power to directly heat reaction mass, and therefore would not require an electrical generator like most other forms of solar-powered propulsion do.

Economics and politics of solar power

  • Cost of electricity by source – a calculation of the cost of generating electricity at the point of connection to a load or electricity grid.
  • Duck curve – graphs the mismatch between peak power load on the grid and hourly solar and wind energy production.
  • Financial incentives for photovoltaics – are incentives offered to electricity consumers to install and operate solar-electric generating systems, also known as photovoltaics.
  • Net metering – an electricity policy for consumers who own renewable energy facilities or V2G electric vehicles.
  • Feed-in tariff – standard offer contract advanced renewable tariff or renewable energy payments) is a policy mechanism designed to accelerate investment in renewable energy technologies.

Solar power by country

  • Solar power by country – many industrialized nations are installing significant solar power capacity in their grids as a supplement or alternative to other power sources. Long distance transmission allows remote renewable energy resources to be used to displace fossil fuel consumption.
  • * Solar power in Australia – growth in the amount of installed PV capacity in Australia has been dramatic with a 10-fold increase between 2009 and 2011. Feed-in tariffs and mandatory renewable energy targets designed to assist renewable energy commercialisation in Australia have largely been responsible for the rapid increase.
  • * Solar power in Canada – Canada has many regions that are sparsely populated and difficult to access. Photovoltaic cells are increasingly used as standalone units, mostly as off-grid distributed electricity generation to power remote homes, telecommunications equipment, oil and pipeline monitoring stations and navigational devices.
  • * Solar power in China – China has over 400 photovoltaic companies. In 2007 China produced 1.7 GW of solar panel capacity, nearly half of the world production of 3.8 GW, although 99% was exported.
  • * Solar power in the European Union – During 2010, the European solar heating yield was 17.3 TWh, annual turnover was 2.6 Billion € and employment was 33,500 persons.
  • ** Solar power in Germany – in 2011, solar PV provided 18 TWh of electricity in Germany, about 3% of its total electricity capacity.
  • ** Solar power in Italy – ranked among the world's largest producers of electricity from solar power with an installed photovoltaic nameplate capacity of 12,750 MW at the end of 2011 and 263,594 plants in operation as of 18 August 2011.
  • ** Solar power in Portugal
  • *** Serpa solar power plant
  • *** Moura Photovoltaic Power Station
  • ** Solar power in Romania – had in 2007 an installed capacity of 0.
  • ** Solar power in Spain – one of the most advanced countries in the development of solar energy, and it is one of the European countries with the most hours of sunshine. Spain is the fourth largest manufacturer in the world of solar power technology and exports 80 percent of this output to Germany.
  • *** Olmedilla Photovoltaic Park – photovoltaic power plant in Olmedilla de Alarcón, Spain, with 270,000 solar photovoltaic panels generating 60 megawatts. It produces enough electricity to power more than 40,000 homes.
  • ** Solar power in the United Kingdom – with a total installed generating capacity of 750 megawatts.
  • * Solar power in India – already a leader in wind power generation, India is planning to produce 20 GW of solar power by 2020.
  • * Solar power in Israel – with no oil reserves and the country's tenuous relations with its oil-rich neighbors, the search for a stable source of energy is a national priority. Solar technology in Israel has advanced to the point where it is almost cost-competitive with fossil fuels.
  • * Solar power in Japan – a leading manufacturer of solar panels and is in the top 5 ranking for countries with the most solar PV installed.
  • * Solar power in Pakistan
  • * Solar power in the United States – an area of considerable activity and there are many utility-scale solar power plants.
  • * Solar power in Turkey

Storage of solar energy

Applications of solar energy

  • Solar balloon – a balloon that gains buoyancy when the air inside is heated by the Sun's radiation, usually with the help of black or dark balloon material.

Agriculture

  • Greenhouse – is a building in which plants are grown.
  • Polytunnel – a tunnel made of polyethylene used to grow plants that require a higher temperature and/or humidity than that which is available in the environment.
  • Row cover any material used as a protective covering to shield plants, usually vegetables, primarily from the undesirable effects of cold and wind, and also from insect damage.
  • Solar-powered pump – an off-the-grid system made up of solar panels, its controller and a pump

Appliances

  • Solar-powered refrigerator – An appliance to keep food or other things cool; runs on energy directly obtained from the Sun.
  • Solar air conditioning – To keep buildings cool; runs on energy directly obtained from the Sun.
  • Solar lamp – a portable light fixture composed of an LED lamp, a photovoltaic solar panel, and a rechargeable battery.
  • Solar charger – employs solar energy to supply electricity to devices or charge batteries.
  • Solar backpack – a cloth sack carried on one's back and secured with two straps that go over the shoulders, equipped with thin film solar cells and batteries.
  • Solar tree – a decorative means of obtaining solar energy.
  • Solar-powered pump – a pump running on electricity generated by photovoltaics. The operation of solar-powered pumps is more economical and has less environmental impact than pumps powered by an internal combustion engine.
  • Solar-powered watch – partly or wholly powered by solar cells integrated within the watch face.
  • Solar Tuki – a portable solar lamp unit with white LED bulbs designed to provide rural Nepal with an alternative to traditional kerosene tukis, their main current source of night-time illumination.
  • Photovoltaic keyboard – a wireless computer keyboard that charges its batteries from a light source such as the Sun or interior lighting, addressing a major drawback of wireless computer peripherals that otherwise require regular replacement of discharged batteries.
  • Solar road stud – maintenance-free flashing lighting devices powered by solar cellsand used in road construction to delineate road edges and centre lines.
  • Solar cell phone charger – uses solar panels to charge cell phone batteries.
  • Solar notebook – a laptop with powerful batteries that are recharged by a solar panel attached to the notebook.
  • Solar-powered calculator – hand-held electronic calculators powered by photovoltaic panels mounted on the device.
  • Solar-powered fountain – an electrical fountain powered by a solar panel.
  • Solar-powered radio – a portable radio receiver powered by photovoltaic panels.
  • Solar-powered flashlight – flashlights powered by solar energy stored in rechargeable batteries.
  • Solar-powered fan – a mechanical fan powered by solar panels.
  • Solar street light – raised light sources which are powered by photovoltaic panels generally mounted on the lighting structure.
  • Solar traffic light – a signalling device powered by solar panels positioned at road intersections, pedestrian crossings and other locations to control the flow of traffic.

Building

  • Passive solar building design – windows, walls, and floors are made to collect, store, and distribute solar energy in the form of heat in the winter and reject solar heat in the summer.
  • Building-integrated photovoltaics – photovoltaic materials are used to replace conventional building materials in parts of the building envelope such as the roof, skylights, facades, or bri-soleil.
  • Urban heat island – is a metropolitan area which is significantly warmer than its surrounding rural areas due to the modification of land surfaces, and waste heat from buildings and transportation.

Lighting

  • Hybrid solar lighting – or hybrid lighting systems combine the use of solar with artificial light for interior illumination by channelling sunlight through fiber optic cable bundles to provide solar light into rooms without windows or skylights, and by supplementing this natural light with artificial—typically LED—light as required.
  • Solar lamp – a portable light fixture composed of an LED lamp, a photovoltaic solar panel, and a rechargeable battery.
  • Solar Tuki – a portable solar lamp unit with white LED bulbs designed to provide rural Nepal with an alternative to traditional kerosene tukis, their main current source of night-time illumination.
  • Light tube – or light pipes are used for transporting or distributing natural or artificial light.
  • Daylighting – the practice of placing windows or other openings and reflective surfaces so that during the day natural light provides effective internal lighting.

Process heat

  • Solar pond – a pool of saltwater which acts as a large-scale solar thermal energy collector with integral heat storage for supplying thermal energy.
  • Solar furnace – a structure that uses concentrated solar power to produce high temperatures, usually for industry.
  • Salt evaporation pond – also called salterns or salt pans, are shallow artificial ponds designed to produce salts from sea water or other brines.

Solar cooking

  • Solar cooker – or solar oven, is a device which uses the energy of sunlight to heat food or drink to cook it or sterilize it.

Solar disinfection

  • Solar water disinfection – also known as SODIS is a method of disinfecting water using only sunlight and plastic PET bottles.
  • Soil solarization – an environmentally friendly method of using solar power for controlling disease agents in the soil by mulching the soil and covering it with tarp, usually with a transparent polyethylene cover, to trap solar energy.

Solar-powered desalination

  • Solar desalination – a technique to desalinate water using solar energy.
  • Solar still – a low-tech way of distilling water, powered by the heat of the sun.
  • Desalination – desalinization, or desalinisation refers to any of several processes that remove some amount of salt and other minerals from saline water.

Solar water heating

  • Solar water heating – or solar hot water systems comprise several innovations and many mature renewable energy technologies that have been well established for many years.
  • Solar combisystem – provides both solar space heating and cooling as well as hot water from a common array of solar thermal collectors, usually backed up an auxiliary non-solar heat source.
  • Solar controller – an electronic device that turns on and off power to the circulating pump in a solar water heater.

Solar-powered transport

  • Electric boat – were popular from the 1880s
  • Electric aircraft – an aircraft that runs on electric motors rather than internal combustion engines, with electricity coming from fuel cells, solar cells, ultracapacitors, power beaming, or batteries.
  • Solar vehicle – an electric vehicle powered completely or significantly by direct solar energy.

Land transport

  • Solar vehicle – an electric vehicle powered completely or significantly by direct solar energy.
  • Solar car – a solar vehicle used for land transport.
  • Solar roadway – a road surface that generates electricity by solar photovoltaics.
  • Solar golf cart – are golf carts powered by mounting a photovoltaic or thin film panel on top of the existing roof or using a PV panel as the roof itself.
  • The Quiet Achiever – also known as the BP Solar Trek, was the world's first practical solar-powered car built to be driven by a person for long distances and powered solely by photovoltaic solar cells with no other back-up power source (i.
  • Sunmobile – was a model of a solar-powered automobile.

Air transport

  • Electric aircraft – an aircraft that runs on electric motors rather than internal combustion engines, with electricity coming from fuel cells, solar cells, ultracapacitors, power beaming, or batteries.
  • Mauro Solar Riser – an American biplane ultralight electric aircraft that was the first crewed aircraft to fly on solar power.
  • Solar panels on spacecraft – spacecraft in the inner Solar System use solar panels for power.
  • Solar-Powered Aircraft Developments Solar One
  • Gossamer Penguin – was a solar-power experimental aircraft created by Paul MacCready's AeroVironment.
  • Qinetiq Zephyr – a lightweight solar-powered UAV which was originally designed and built by the QQ1 "Edge of Space" team who were sponsored by the United Kingdom defence firm, Qinetiq.
  • Solar Challenger – was a solar-powered electric aircraft designed by Paul MacCready's AeroVironment.

Water transport

  • Solar powered boat – Photovoltaic power, temporarily stored in accumulator batteries, is used to drive a propeller via an electric motor.

Solar vehicle racing

Solar energy organizations

Solar energy publications

Persons influential in solar energy