STEM与日常科技·英语30篇（6）
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Why Solar Panels Work Better on Cool, Sunny Days
为什么晴朗凉爽的天气更利于太阳能发电
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Solar panels convert sunlight into electricity using photovoltaic cells made of silicon.
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Though bright sun is essential, high temperatures actually reduce their efficiency by 0.3–0.5% per degree Celsius.
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On hot days, electrons in the silicon become too energetic, causing more resistance and heat loss.
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Cooler air improves heat dissipation, helping cells maintain optimal voltage and current output.
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That’s why cities like Portland or Berlin often get more annual energy per panel than hotter places like Phoenix—despite fewer sunny hours.
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Modern inverters also adjust voltage dynamically to match changing panel performance in real time.
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Dust, snow, or shading from trees can cut output more than heat, so regular cleaning matters too.
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Engineers now design bifacial panels that capture reflected light from rooftops or ground surfaces.
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Researchers are testing perovskite layers to boost efficiency without raising operating temperatures.
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So next time you see solar panels gleaming on a crisp autumn morning, remember: cool + sun = peak power.