After selecting the solar photovoltaic panel, the first thing to consider during installation is the selection of the placement orientation angle. If the orientation angle is chosen incorrectly, it will not receive sunlight. If the installation angle is not correct, it will also affect the efficiency of power generation.

The common direction for solar photovoltaic panel installations nowadays is to choose the direction of due south, without deviating too much. According to physics, the longer the sun shines on a solar panel, the closer it is to vertical illumination, and the more energy it receives.

Because our country is located in the northern hemisphere, sunlight shines from the south. After scientific research, it has been found that the highest efficiency of power generation occurs when the orientation of solar panels is in the due south direction. The most efficient scenario is at 20 degrees southwest, which allows for good exposure to light regardless of the season. Because the Earth's rotational axis and orbital path are not perpendicular. In our opinion, the angle of the sun varies in different seasons, with a difference of about 23.4 degrees. The median angle of the sun appears at the vernal and autumnal equinoxes. Through comprehensive calculations, the optimal tilt angle for a year should be slightly larger than the latitude we are at in order to achieve the maximum value received throughout the year.

However, when choosing a direction, attention should also be paid to the influence of surrounding buildings and trees, as well as the factors of buildings blocking sunlight and shadows. These will have an impact on the power generation efficiency of solar panels.

To determine the orientation, it is necessary to determine the installation tilt angle. The optimal placement angle for solar photovoltaic panels is 45 degrees. Different placement angles result in varying amounts of sunlight exposure over the course of a year. If placed flat, the sun is not directly shining, and some may think that the difference in daily effects is not significant. However, solar photovoltaic panels collect light over time, and the difference is still significant over time. For the tilt angle, most solar photovoltaic panels have an angle of around 45 degrees, which is mainly determined by the local latitude.