When you buy a solar panel, you usually ask for the Wattage. What is provided to you as a specification is Peak Wattage, or in general, Peak Capacity.
What is a Peak Capacity or Peak Wattage of a solar cell?
Peak capacity of solar cells refers to the amount of power generated by the solar cells under the best possible solar radiation.
Peak capacity of solar cells, denoted in Watt-peak (Wp), Kilowatt peak (kWp) or MW peak (MWp), refers to the maximum power the solar cells can deliver under standard conditions typically referring to conditions of good sunlight. A 1 kWp solar cell can generate power at 1 kW if the standard conditions are met.
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