Quick Answer
Solar panels perform most efficiently in temperatures between 59°F (15°C) and 95°F (35°C).
Ideal Temperature Range
The ideal temperature range for solar panel performance is between 59°F (15°C) and 95°F (35°C). Performance drops below 32°F (0°C) due to reduced solar radiation and increased electrical resistance. Above 104°F (40°C), efficiency decreases as increased heat reduces panel voltage.
Temperature Coefficients
Temperature coefficients measure the change in solar panel performance relative to temperature. A typical temperature coefficient for solar panels is -0.3 to -0.5% per degree Celsius. This means that for every degree Celsius increase above 25°C, panel efficiency decreases by 0.3 to 0.5%. Most solar panels experience a 0.4% efficiency loss per degree Celsius above 25°C.
Effects of Extreme Temperatures
Solar panels can withstand extreme temperatures, but prolonged exposure can lead to degradation. A study by the National Renewable Energy Laboratory (NREL) found that solar panels lose 0.7% of their nameplate capacity for every year of exposure above 104°F (40°C). This degradation rate accelerates to 1.2% per year above 122°F (50°C). Regular cleaning and monitoring can help mitigate the effects of extreme temperatures on solar panel performance.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.