Quick Answer
Bifacial panels can generate 10-25% more energy in winter due to reflected light from snow. This increase is more pronounced in areas with heavy snowfall. The exact amount depends on panel efficiency, snow depth, and irradiance.
Bifacial Performance in Winter
Bifacial panels are designed to capture light from both the front and back sides, increasing energy output. In winter, this design shines as snow on the ground can reflect up to 20% of incident irradiance back onto the panel. Assuming an average winter irradiance of 400 W/m² and a snow albedo of 0.8, we can estimate the additional energy gain. For a 250 W module operating at 20% bifaciality, the energy gain from reflected light would be around 10-15 W, corresponding to a 3-5% increase in winter energy production.
Bifacial Efficiency Factors
The efficiency of bifacial panels in winter also depends on the panel’s rear-side reflectivity. High-efficiency modules with improved rear-side coatings can capture up to 90% of reflected light. The efficiency also depends on the panel’s angle of incidence. Panels installed at a 30° angle can capture more reflected light than those installed at a 0° angle. A more aggressive angle, such as 45°, can result in even higher energy gains.
Real-World Examples
Studies have shown that bifacial solar farms in cold climates can achieve energy gains of up to 25% in winter compared to traditional monofacial panels. For example, a study on a 10 MW bifacial solar farm in Minnesota found that the system produced 15% more energy in January compared to July. The study attributed this increase to the high albedo of the surrounding snow. As the technology continues to evolve, we can expect to see even higher energy gains from bifacial panels in cold climates.
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