China's housing construction is generally divided into three roof structures: cement roof, color steel plate roof and tile roof. According to the photovoltaic installation conditions, it is mainly divided into plane roof and inclined roof.
When we install a photovoltaic power station, we should not only know what kind of roof we have, but also know the orientation of our house and the area where we can install photovoltaic modules.
Orientation of roof
The best way to install
photovoltaic power stations is to install them in the south, because in the northern hemisphere, when the power generation board faces south, the power generation is the highest, and the solar radiation is also the best. Especially in summer, the solar
radiation is strongest after noon. When the direction is due south to west, the maximum power generation will be obtained; Similarly, the maximum solar radiation direction in winter is slightly eastward. Therefore, as long as your roof is within ± 10
° in the south, it will not have much impact on power generation
Not all roofs facing south can be paved with photovoltaic modules. We should consider that the surrounding trees and other buildings will not block the photovoltaic modules. Obstacles will cause hot spot effect on solar panels, which will not only
affect the overall power generation, but also cause fatal damage to the panels.
Actual usable area
It's easy to determine the direction of the roof, but how to calculate the shielding area of obstacles? There is a simple algorithm. The width
of the shelter can be approximated by the height of the shelter × 2。 Subtract this area from the total area of the roof where the components are installed, and it is the actual usable area of the roof.