The Influence of The Solar Panel’s Installation Direction and Installation Angle

Since the amount of solar radiation that hits the solar cell module changes depending on the orientation in which the solar cell is installed, the amount of power generated also changes. The best installation orientation is south, but it can be installed in other orientations. However, when installing on the roof on the north side, the power generation output of the solar cell module will be smaller than in other directions, and depending on the conditions, the reflected light of the solar cell module may affect the neighborhood, so be careful. Is required.

Power generation ratio when the south side is 100%

* Calculation example in Tokyo when the solar cell is tilted 30 degrees with respect to the horizontal and installed facing south.

In addition, the amount of power generated varies greatly depending on the installation angle.

The figure below shows the relationship between the azimuth and tilt angles of the amount of solar radiation in Tokyo. It can be said that the condition for the largest amount of solar radiation throughout the year is when the angle of inclination is about 30 degrees in the direction of the south.

Effect of installation angle on power generation