When the temperature is the same, with the increase of sunlight intensity, the open circuit voltage of the photovoltaic module is almost unchanged, the short-circuit current increases, and the maximum output power increases; The current increases and the maximum output power decreases; no matter at any temperature and sunlight intensity, photovoltaic modules always have a maximum power point, and the temperature (or sunlight intensity) is different, and the position of the maximum power point is also different.
Determining the inclination angle of the photovoltaic array needs to maximize the amount of solar radiation received by the square array throughout the year, and at the same time consider the self-cleaning effect of rainwater and snow self-clearing of photovoltaic modules, as well as the combination with the building.
In the case of a good combination with the building and considering the self-cleaning of the components, the selection of the inclination angle of the photovoltaic array is based on the maximum annual total radiation at different inclination angles.
Under normal circumstances, when the photovoltaic array is oriented to the south, that is, the azimuth angle is 0°, the power generation of solar cells is the largest, so the azimuth angle of the photovoltaic array is determined to be 0°. The main orientation of buildings with photovoltaic systems should be south or close to south.
The relationship between different orientations and power generation is as shown in the figure below. In different locations and under different climatic conditions, the proportion of power generation in different orientations is different.