How Temperature Affects Solar Panels

Do solar panels work better in hot or cold weather?

Solar panels lose approximately 0.3-0.5% of efficiency for every 1°C above 25°C (the testing temperature). On a 30°C UK summer day, output drops by about 2-3%. On a cool, bright spring day (15°C), panels are MORE efficient than on a hot day at the same light level. The UK's moderate temperatures are actually an advantage — panels run cooler than in desert climates, maintaining higher efficiency year-round.