Advantages of alpine solar systems (Switzerland)

Alpine solar systems have the following advantages, among others:

• Temperature
  The temperature decreases with increasing altitude above sea level. The efficiency of the solar cells increases as the temperature decreases.
  See also Temperature climate standard values by altitude.
• Global radiation
  Global radiation increases with increasing altitude. On average, slightly more in winter than in summer. As global radiation is the "fuel" of the solar cells, the higher global radiation has a positive effect on the yield.
  See also Global radiation climate standard values by altitude.
• Reflection (albedo)
  Snow reflects much more of the incident radiation than a snow-free meadow, for example. The reflected radiation increases the yield of the solar cells. The prerequisite is that the solar cells are aligned almost vertically and preferably facing south.
  The reflections can be better utilized if so-called bifacial solar panels are used. These panels can also convert radiation incident on the rear side into energy. According to the manufacturers, the additional yield is between 5 and 30%.
  The additional yield due to the reflections is reduced in large alpine solar systems by the shadows cast by the solar tables arranged in x rows.
  

For the reasons mentioned above, an alpine solar system generally produces more energy than a comparable system in the lowlands. Especially in winter. The magnitude of the additional yields can be seen here.