Most people don’t give the color of their roofs a second thought, but it could be costing their business a lot of money.
White or light gray roofs can increase rooftop bifacial PV energy yields by up to 25 percent and increase the return on investment by up to 10 percent, according to new research by Opsun, a bifacial PV racking company.
Other companies are improving performance more directly. According to Reuters, a German company called Enerparc improved their bifacial performance by adding a field layer — they covered the ground with gravel, which reflected more light on the panels. They also found that performance changed with the season, improving during the winter when there’s presumably ice and snow on the ground.