Characteristics Of Bifacial Solar Panels And Factors Affecting The Power Generation Of Bifacial Panels

 

With the continuous development and innovation of photovoltaic panel technology, the research on high-efficiency batteries has achieved fruitful results. For example, bifacial solar panels, compared with single-sided cells, the back of bifacial cells can also absorb sunlight to increase the power generation of bifacial panels. Today we share the characteristics of bifacial solar panels and the factors affecting the power generation of bifacial panels.

The back can generate electricity

The back of bifacial photovoltaic panels can generate electricity using reflected light from the ground, etc. The higher the reflectivity of the ground, the stronger the light received by the back of the battery, and the better the power generation effect. The application of bifacial photovoltaic panels on the grass can increase the power generation by 8%-10%, and on the snow, it can increase the power generation by up to 30%.

Accelerate the melting of snow on the panels in winter

After conventional photovoltaic panels are covered with snow in winter, if the snow cannot be cleared in time, the panels are easy to freeze in a continuous low temperature environment, which not only seriously affects the power generation efficiency, but also is very likely to cause unpredictable damage to the panels. When the front side of the bifacial solar panel is covered by snow, the back side of the panel can receive reflected light from the snow to generate electricity and heat, which accelerates the melting and sliding of the snow and increases the power generation.

Double-glass panels

The back panel of the bifacial photovoltaic panel is generally made of transparent glass, which can be called double-glass panels. Double-glass panels can reduce the use of junction boxes, cables, etc. in 1500V photovoltaic systems, reducing the initial system investment cost. At the same time, since the water permeability of the glass is almost zero, there is no need to consider the problem of water vapor entering the component to induce PID and cause the output power to drop; and this type of component has stronger environmental adaptability and is suitable for photovoltaic power stations built in areas with more acid rain or salt fog.

Flexible installation direction and location

Since the front and back sides of the component can generate electricity by light, the power generation efficiency under vertical placement conditions is more than 1.5 times that of general components, and it is little affected by the installation direction, which is suitable for installation methods with limited installation methods, such as guardrails, soundproof walls, BIPV systems, etc.

According to current installation experience, the higher the height of the photovoltaic module from the ground, the more obvious the back gain effect. When the module is above 1.3M from the ground, the increase in irradiance received by the back slows down. If the bracket load, cost, maintenance and other factors are considered comprehensively, the height of the module from the ground is preferably between 0.7-1.2M.

The back of the bifacial solar module can generate electricity using reflected light from the ground, etc. The higher the ground reflectivity, the stronger the light received by the back of the battery. The better the power generation effect.

Photovoltaic industry professionals have conducted an analysis and compared the power generation of bifacial modules on four types of ground: snow, cement, yellow sand, and grass. Through the analysis of power generation data throughout the year, it was found that compared with conventional module systems, bifacial modules combined with snow background have the largest power generation gain, followed by cement, yellow sand, and grass. On snow, the power generation can be increased by up to 30%, and on grass, it can be increased by 8%-10%.

During installation, it is necessary to calibrate as much as possible towards the angle and direction with the maximum solar radiation. In most parts of the country, the installation angle is generally -5 degrees based on the local latitude, and the installation angle is generally slightly west of due south. The lower the latitude, the smaller the impact of the installation inclination. In high-latitude areas, the installation inclination has a great impact on the single-day/short-term power generation of solar modules, and the difference in single-day power generation can be up to 1 times. In addition, in high-latitude areas, the inclination should be appropriately reduced based on the above calculation.

Taking Baoding, Hebei as an example, the local latitude is about 38 degrees, and the installation inclination is suitable at about 33 degrees.

Based on the current installation experience, the spacing between the arrays of components has a significant impact on the power generation of the power station. According to calculations, the larger the spacing between the arrays, the more obvious the gain effect on the back. Considering the construction cost of the power station, in the actual installation process, the spacing between the arrays of components should be determined according to the project itself.

The back of the bifacial photovoltaic module can bring additional power generation, realizing the cost reduction and efficiency improvement of the photovoltaic power station. At the same time, it meets the goal of photovoltaic power generation at parity and accelerates the realization of photovoltaic power generation at parity.