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PV modules, (photovoltaic) often referred to as a solar cell, changes the energy in sunlight directly into electrical current with a process called the photovoltaic effect. pv modules are used to produce electrical power in all types of homes, commercial applications such as street lights and even to power satellites. The photovoltaic effect has been known since Edmund Becquerel observed light-induced currents in a dilute acid in 1839. Explanation of the effect were first proposed by Planck in nineteen hundred and Wilson in nineteen thirty. The first solid-state silicon pv modules were designed in nineteen fifty four, after the development of solid-state diodes and transistors. Since that time, the number of applications of pv modules has been increasing, the cost per watt of power generated has been declining, and efficiency has been increasing.
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