MacBook Core m7 12in Buying Guide Why Its A Great Option? Recombination can take place in the bulk of the semiconductor, at the surfaces, in the junction region, at defects, or between interfaces. fill factor The ratio of a photovoltaic cells actual power to its power if both current and voltage were at their maxima. The solar glossary contains definitions for technical terms related to solar power and photovoltaic (PV) technologies, including terms having to do with electricity, power generation, and concentrating solar power (CSP).1, A B C D E F G H I J K L M N O P Q R S T U V W X Y Z. The meaning of WHAT WITH is used to introduce the part of a sentence that indicates the cause of something. Knowing the battery voltage is important to convert it to a unit comparable to Wh. Is the lumen really space or does it just absorb all other wavelengths and appear empty? Direct link to Leela's post How do carotenoids dissip, Posted 5 years ago. For normal operations, daily and weekly forecasts of the hour-by-hour demand are used to help develop generation schedules to ensure that sufficient quantities and types of generation are available when needed. Smoke Detector Flashing Red Every 30 Seconds | Reasons + Fix, Carbon Monoxide Detector Went Off Then Stopped (Cause + Fix), Hardwired Smoke Alarm Keeps Going Off At Night | Cause + Fix, Does Elon Musk Have An Engineering Degree? Your old batteries capacity is typically listed in the mAh rating. annual solar savings The annual solar savings of a solar building is the energy savings attributable to a solar feature relative to the energy requirements of a non-solar building. The control element is in series with the PV array and battery. Changing the batteries in your solar lights regularly, maybe once or twice a year is a good idea. In a metal, the Fermi level is very near the top of the filled levels in the partially filled valence band. charge controller A component of a photovoltaic system that controls the flow of current to and from the battery to protect it from over-charge and over-discharge. A p-dopant creates electron vacancies (holes). See also single-crystal silicon an polycrystalline silicon. reactive power The sine of the phase angle between the current and voltage waveforms in an alternating current system. superconducting magnetic energy storage (SMES) SMES technology uses the superconducting characteristics of low-temperature materials to produce intense magnetic fields to store energy. To be used for typical 120 volt or 220 volt household appliances, DC must be converted to alternating current, its opposite. Also, the earth or ground in a cathodic protection system. It consists of a direct current source, four switches, and the load. The colors, from longest wavelength to shortest, are: red, orange, yellow, green, blue, indigo, and violet. The reactions are almost completely reversible. This is used to creates steam, which spins a turbine to generate electricity. A absorber In a photovoltaic device, the material that readily absorbs photons to generate charge carriers (free electrons or holes). pyranometer An instrument used for measuring global solar irradiance. See also resistance. high voltage disconnect hysteresis The voltage difference between the high voltag disconnect set point and the voltage at which the full photovoltaic array current will be reapplied. lattice The regular periodic arrangement of atoms or molecules in a crystal of semiconductor material. Answered, How Much Electricity Does It Take To Kill A Human? Pounds are to bananas. A residential photovoltaic system is a distributed system. junction diode A semiconductor device with a junction and a built-in potential that passes current better in one direction than the other. building integrated photovoltaics A term for the design and integration of photovoltaic (PV) technology into the building envelope, typically replacing conventional building materials. The combined radiation in the wavelength region from 280 nm to 4,000 nm is called the broadband, or total, solar radiation. kilowatt-hour (kWh) 1,000 thousand watts acting over a period of 1 hour. I incident light Light that shines onto the face of a solar cell or module. Landscape lighting can help improve your home's security, illuminate pathways, brighten outdoor living spaces and complement the overall landscaping. Lastly, try changing the batteries in the solar lights. hydrogenated amorphous silicon Amorphous silicon with a small amount of incorporated hydrogen. Chlorophyll looks green not because it absorbs green light, but actually because it doesn't absorb it. See also inverter. QE is given as a function of either wavelength or energy. depletion zone Same as cell barrier. concentrating photovoltaics (CPV) A solar technology that uses lenses or mirrors to concentrate sunlight onto high-efficiency solar cells. parallel connection A way of joining solar cells or photovoltaic modules by connecting positive leads together and negative leads together; such a configuration increases the current, but not the voltage. photovoltaic (PV) generator The total of all PV strings of a PV power supply system, which are electrically interconnected. 1 kWh=3600 kJ. battery life The period during which a cell or battery is capable of operating above a specified capacity or efficiency performance level. NEMA See National Electrical Manufacturers Association. See also power factor. donor In a photovoltaic device, an n-type dopant, such as phosphorus, that puts an additional electron into an energy level very near the conduction band; this electron is easily exited into the conduction band where it increases the electrical conductivity over than of an undoped semiconductor. amorphous silicon A thin-film, silicon photovoltaic cell having no crystalline structure. peak power point Operating point of the I-V (current-voltage) curve for a solar cell or photovoltaic module where the product of the current value times the voltage value is a maximum. Circuitry: This is the most crucial component of a solar light, and the one that most often separates the good solar lights from the bad. Test results are subject to a list of defined requirements. "N" stands for an additional nylon coating that makes the wire both oil and gasoline resistant. one-axis tracking A system capable of rotating about one axis. Electricity transmission networks use AC because voltage can be controlled with relative ease. standby current This is the amount of current (power) used by the inverter when no load is active (lost power). One minus tare loss, expressed as a percentage, is equal to the controller efficiency. How would you tell? float service A battery operation in which the battery is normally connected to an external current source; for instance, a battery charger which supplies the battery load< under normal conditions, while also providing enough energy input to the battery to make up for its internal quiescent losses, thus keeping the battery always up to full power and ready for service.float-zone process In reference to solar photovoltaic cell manufacture, a method of growing a large-size, high-quality crystal whereby coils heat a polycrystalline ingot placed atop a single-crystal seed. The barrier inhibits the movement of electrons from one layer to the other, so that higher-energy electrons from one side diffuse preferentially through it in one direction, creating a current and thus a voltage across the cell. Has less harmonic content than a square wave. EDIT: turns out r/keyboards is pretty active so i'll ask there too EDIT 2: my windows key doesnt work so the "w" might be for windows. Used to describe the operating regime of appliances or loads in photovoltaic systems. direct current (DC) A type of electricity transmission and distribution by which electricity flows in one direction through the conductor, usually relatively low voltage and high current. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Can we conduct photosynthesis under monochromatic light rays such as green? infrared radiation Electromagnetic radiation whose wavelengths lie in the range from 0.75 micrometer to 1000 micrometers; invisible long wavelength radiation (heat) capable of producing a thermal or photovoltaic effect, though less effective than visible light. Often used as a front contact or one component of a heterojunction solar cell. dispatching (economic dispatch) A method by which system operators decide how much output should be scheduled from plants. See also stand-alone systems. The absorption spectrum of chlorophylls includes wavelengths of blue and orange-red light, as is indicated by their peaks around 450-475 nm and around 650-675 nm. gel-type battery Lead-acid battery in which the electrolyte is composed of a silica gel matrix. The lumen would contain all of the reactants and intermediates of the light-dependent reactions. levelized cost of energy (LCOE) The cost of energy of a solar system that is based on the systems installed price, its total lifetime cost, and its lifetime electricity production. inverted metamorphic multijunction (IMM) cell A photovoltaic cell that is a multijunction device whose layers of semiconductors are grown upside down. kilowatt (kW) A standard unit of electrical power equal to 1000 watts, or to the energy consumption at a rate of 1000 joules per second. Lumens let you buy the amount of light you want. This means that an electron jumps to a higher-energy orbital ( an orbital that is further from the nucleus). There, it would be reconverted into electricity and distributed the same as any other centrally generated power, through a grid. All rights reserved. contingency reserves Reserve services that are sufficient to cover the unplanned trip (disconnect) of a large generator or transmission line and maintain system balance. See also diffuse insolation and direct insolation. They're responsible for what light is absorbed and what light is reflected. battery energy storage Energy storage using electrochemical batteries. dendritic web technique A method for making sheets of polycrystalline silicon in which silicon dendrites are slowly withdrawn from a melt of silicon whereupon a web of silicon forms between the dendrites and solidifies as it rises from the melt and cools. inverter A device that converts direct current electricity to alternating current either for stand-alone systems or to supply power to an electricity grid.
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