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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

Semiconductor materials, such as silicon, gallium arsenide, and cadmium telluride, are commonly employed in the manufacturing of solar cells. Each material has a specific bandgap that dictates its efficiency in converting sunlight into electricity. Silicon, for example, has a bandgap of about 1.1 eV, which allows it to effectively utilize a significant portion of the solar spectrum. However, while silicon-based solar cells dominate the market due to their cost-effectiveness, they often operate at efficiencies around 15-22% in real-world conditions.
solar panel theoretical efficiency
