CSLB C-46 Solar ContractorPhotovoltaic System InstallationHard
A solar contractor is installing a ground-mounted PV system on a sloped terrain. To ensure optimal energy production throughout the year, what is the primary factor to consider when determining the tilt angle of the PV modules in a fixed-tilt system in California?
- AThe minimum snow load requirement for the region.
- BThe highest historical wind speed for the location.
- CThe angle that maximizes production during the summer months.
- DThe annual average solar altitude at solar noon.
Show answer & explanationAnswer & explanation
Correct answer: D. The annual average solar altitude at solar noon.
For a fixed-tilt system aiming for optimal annual energy production, the ideal tilt angle is generally close to the site's latitude. This angle approximates the annual average solar altitude at solar noon, balancing seasonal variations to maximize total yearly output.
Why the other options are wrong
- A. Snow load requirements influence structural design and module clearance, but not the optimal tilt angle for energy production.
- B. Wind speed is critical for structural design, not for optimizing energy production tilt angle.
- C. Maximizing summer production alone would lead to a flatter tilt, significantly reducing winter production and overall annual output.
Fixed PV Tilt Angle Optimization
Selecting the best stationary angle for PV modules to maximize annual energy yield, often approximated by the site's latitude.
- Tilt angle affects solar irradiance interception.
- Latitude is a common starting point for fixed tilt.
- Adjustments can be made for seasonal prioritization (e.g., more winter or summer production).
Memory trick: Latitude's your guide for annual gain, but seasons shift the sun's domain!