Best mounting height for solar panels in desert climates?

Considering Ground-Level Shading

When mounting solar panels in desert climates, it’s essential to consider ground-level shading. Vegetation, buildings, or other obstructions can cast shadows on the panels, reducing their efficiency. A higher mounting height can help minimize this issue, ensuring that the panels receive direct sunlight throughout the day. In general, a height of 8-10 feet above the ground is sufficient to clear most obstructions while maintaining a stable and secure installation.

Accounting for Solar Summer Heat Derating

Solar panels in desert climates experience significant temperature increases, leading to derating and reduced efficiency. By mounting panels at a higher elevation, you can take advantage of natural cooling through wind flow. A study by the National Renewable Energy Laboratory (NREL) found that increasing the mounting height from 3 to 10 feet can reduce panel temperatures by up to 15°C (27°F), resulting in a 2-4% increase in efficiency. To maximize this effect, consider using a tilt angle of 30° to 40°, which allows for optimal wind flow and reduced shading.

Additional Considerations for Solar Panel Mounting

In addition to considering ground-level shading and solar summer heat derating, it’s also essential to ensure that the mounting structure is stable and secure. Use a sturdy racking system that can support the weight of the panels, and consider using a tracker system to optimize panel orientation and energy production. Finally, consult with local building codes and regulations to ensure compliance with all relevant requirements.