Quick Answer
Dual-Axis Trackers can partially compensate for cloudy days, but their effectiveness depends on the frequency and duration of the clouds. Even with tracking, energy production will be reduced compared to clear days, but the trackers can still provide a significant amount of energy during overcast conditions. They are most beneficial in locations with moderate to high cloud cover.
Benefits of Dual-Axis Tracking
Dual-axis trackers can compensate for cloudy days by adjusting the solar panel’s angle and orientation to maximize energy production. By tracking the sun’s movement, they can maintain a higher angle of incidence, which reduces the impact of cloud cover on energy production. For example, a dual-axis tracker can maintain a 30% higher angle of incidence than a fixed rack system, resulting in a 10-20% increase in energy production on cloudy days.
Impact of Cloud Cover on Tracker Performance
Cloud cover can reduce energy production by up to 50% or more, depending on the cloud density and duration. However, dual-axis trackers can mitigate this effect by adjusting their angle and orientation to capture more sunlight. For instance, a study on a commercial solar farm found that dual-axis trackers produced 25% more energy on a cloudy day with 50% cloud cover compared to a fixed rack system.
Practical Considerations
When selecting a dual-axis tracker, consider the site’s specific climate and cloud cover patterns. In regions with frequent and prolonged cloud cover, dual-axis trackers can provide significant benefits. However, in areas with clear skies, the added cost of a dual-axis tracker may not be justified. It’s essential to perform a detailed analysis of the site’s energy production potential to determine the most cost-effective solution.
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