Do Bifacial Solar Panels Show Different Degradation Trends?

Degradation Mechanisms

Bifacial panels have been shown to exhibit lower degradation rates, particularly in the first 10 years of operation, due to the self-cleaning effect of the rear side. This reduces the impact of dirt and pollution on the panel’s surface, which is a major contributor to degradation. Studies have demonstrated that bifacial panels can retain up to 97% of their initial power output after 25 years, compared to 92% for monofacial panels.

Impact of Light Intensity

The degradation trends of bifacial panels are also influenced by the intensity of light on both sides of the panel. Research has shown that panels exposed to high-intensity light on the rear side can exhibit higher degradation rates, particularly in the form of LID (Light-Induced Degradation). This highlights the importance of careful system design and installation to ensure optimal light absorption and minimize the risk of degradation.

Field Performance Data

Field performance data from large-scale bifacial solar farms have consistently shown lower degradation rates compared to monofacial panels. For example, a study of a 100 MW bifacial solar farm in California reported an average degradation rate of 0.34% per year over 10 years, compared to 0.46% per year for a nearby monofacial solar farm. These findings demonstrate the potential for bifacial panels to provide longer-lasting and more efficient energy production.