Temperature-irradiance dependency of the bifacial power gain. For higher irradiances, bifacial power gain is less. For higher temperatures, the bifaciality is less as well. The lower bifacial power gain for higher irradiances is caused in the midrange by weather conditions, and in the lower range by the changing solar angles. The lower gain for higher temperatures is caused by the higher temperature dependency of the bifacial rear device as compared to the front device. The gain of high temperature low irradiance is very high as that is caused by northern sunset/sunrise.