Study on Optimum Installation Angle of Photovoltaic Module Considering Sunlight Reflection

This paper shows photovoltaic (PV) power generation systems in Nagaoka University of Technology. On the basis of acquired data, installation angle of PV module and effect of sunlight reflection in winter are examined. Consequently, it is cleared that there is the optimum angle for each season, and the reflection against snow is very effective for the PV power generation. The angle usually depends on the latitude of location, but taking account of this effect, suitable installation angle changes. It implies that the optimum angle of all year round has flexibility. Actually, we can get about the same electric power when the angle is between 30 and 60 degrees.