Why should the solar panel be tilted?

Why should the solar panel be tilted? In fact, this problem is related to the efficiency of power generation. When the sun is directly shining on the solar panel, the power generation efficiency can be maximized. Because of the different latitudes in each region, the fixed photovoltaic panels in each region have an optimal tilt angle.

Of course, the best way is to make the board always perpendicular to the sunlight, which is used in many foreign countries. Due to the problems of power generation efficiency and cost in our country, there are few applications for the bracket system that allows the solar panel to track the sunlight.