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Power is a fundamental term in photovoltaics that describes the ability of a solar module or inverter to generate electricity. It is measured in watts (W) and is a critical indicator of the efficiency of solar systems. The higher the power rating of a module or inverter, the more energy it can produce. The output of solar modules is measured under standardised test conditions to ensure comparability. In photovoltaics, it is crucial to ensure that the output of the solar system is optimally matched to the energy needs of the household or business to achieve maximum energy yield.