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The efficiency of a solar panel is not solely determined by its wattage. While a 400-watt panel can generate a significant amount of electricity, its performance is also influenced by factors such as temperature, orientation, and the angle of installation. Therefore, knowing the size of the panel helps users assess how many panels they can fit on their roof or in their yard, and how much energy they can potentially generate.
size of a 400 watt solar panel

Solar energy is electrical or thermal energy harvested from sunlight. Solar panels contain photovoltaic (PV) cells made up of semiconductor materials (such as silicon) to absorb elemental particles from the sun called photons. When absorbed by the panel, the photons release electrons from the atoms of the semiconductor material and the flow of these electrons within the cell creates an electric current we can direct to our circuits.