Do Solar Panels Work in Hot Weather? Temperature Effects

Solar panels lose some output as they heat up. The temperature coefficient (typically −0.25% to −0.35% per °C above 25°C) tells you how much. A hot 40°C day can cost a panel ~4–5% output versus standard conditions.

But hot regions still win overall

Higher sun hours in hot climates usually outweigh the temperature penalty many times over. A system in sunny Arizona or inland Australia still massively out-generates the same system in a cool, cloudy climate.

Lowering heat loss

• Allow airflow behind panels (mounting gap)
• Choose panels with a better (lower) temperature coefficient
• Accept that mid-summer midday clipping is normal