A photovoltaic panel assembly is a power generating device that produces direct current when exposed to sunlight, consisting of a thin, solid photovoltaic cell made almost entirely of semiconductor material, such as silicon. Since there is no active part, it can be operated for a long time without causing any loss. Simple photovoltaic cells provide energy for watches and calculators, and more complex photovoltaic systems provide lighting for the home and power the grid. The photovoltaic panel assembly can be made in different shapes, and the components can be connected to generate more power. In recent years, photovoltaic panels have been used on rooftops and building surfaces, and even as part of windows, skylights or shelters, which are often referred to as photovoltaic systems attached to buildings.
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