Path-Q Solar
How does high heat reduce solar panel output?
Answer
Solar panels generally produce less electrical power as their cell temperature rises above the reference temperature used for their ratings. The reduction is gradual and depends on the panel's temperature coefficient, operating temperature, sunlight, wind, mounting, and ventilation.
Key points
- Panel temperature can be substantially higher than the surrounding air temperature in direct sun.
- The effect reduces instantaneous power and can reduce total energy production during hot periods.
- Hot conditions do not necessarily mean poor annual performance because strong sunlight may still produce substantial energy.
What it depends on
- Panel temperature coefficient
- Ambient temperature, solar irradiance, and wind
- Roof surface and mounting configuration
- Airflow beneath the panels and other system losses
Risks and trade-offs
- Comparing output with the panel's nameplate rating without accounting for temperature can create unrealistic expectations.
- Adding spacing for airflow may improve thermal performance but can affect wind loading, appearance, and installation cost.
- Heat-related loss is normal and should be distinguished from a fault or shading problem.
Information you may need
- Panel model and temperature coefficient
- Local temperature and solar-resource assumptions
- Mounting arrangement and roof conditions
- Measured output compared with irradiance and temperature
Your next step
What to do next
Use the panel's temperature coefficient and local production model to estimate hot-weather output rather than applying a generic percentage reduction.
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