Rooftop PV performs better in spring and summer in the Arctic region, while vertical PV performs better in the fall and winter, new research from the University of Oulu in Finland has found.
According to the report, the best overall months for generating PV in the Finnish Arctic are June and July, while the best season is spring. In the winter season, the vertical PV outperformed the rooftop ones by 98.36% and in the autumn by 30.25%; while in the summer the rooftop panels outperformed the vertical one by 30.44% and in spring by 20.2%.
“Extreme weather and climatic conditions, significant variations in the day lengths leading to polar nights and days, sub-zero temperatures, snow, and significant seasonal temperature variations characterize the Arctic and subarctic regions,” the researchers stated, adding that the collected data provides accurate insights for future investments and improved predictability of the solar simulations.
As for the preferred tilt angle for the rooftop PV throughout the two years, the research has concluded that 28 degrees was the optimal one. According to the researchers, the panels with that tilt generated 3% more power than the others, in an annual comparison.
“It proved the increased potentiality of solar PV panel at this tilt angle to capture the maximum irradiation during the spring and summer seasons,” the paper explained. “The additional advantages of retaining lower tilt angles in the Arctic are the lesser mutual shading losses when the solar panels are in multiple rows, one behind another, allowing snow clearance at much faster rates.”
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