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Explained: Bifacial Solar Panels

If you want to install solar panels, then you need to know that they can produce as much energy as possible. This makes Bifacial solar panels well worth considering because they generate electricity not only from the light-facing side but also from the back, providing more energy to your home than single-sided, Bifacial solar panels. So now let’s understand what is a double-sided battery assembly

What is a Bifacial solar panel?

Conventional monocrystalline solar panels capture sunlight on the light-absorbing side, and light that cannot be captured is reflected away. This is not the case with Bifacial solar panels, which have solar cells on either side. This allows the panel to absorb light from both the back and the front. In practice, this means that Bifacial solar panels can absorb light reflected from the ground or in its direction.

Bifacial solar modules can be used effectively in certain residential applications such as pergolas and some ground-mounted systems. But dual panels don’t make sense for most home owners rooftop installations – bifacial solar panels are best used for commercial or utility-scale applications, where panels are raised and tilted away from the mounting surface, allowing light to reflect off the back of the panel.

Bifacial solar panelsBifacial Solar Panels

Bifacial and monocrystalline solar panels

Most solar panels are single-sided monocrystalline. This means they have a side that absorbs sunlight and converts it into energy. Double-sided solar panels absorb light from both sides, requiring less space.

Because Bifacial panels have more surface area to absorb sunlight, they have been shown to be more effective than traditional panels. If the double-sided modules are installed vertically, they can capture energy at two of the sun’s peak times: sunrise and sunset. Vertically set panels are also more resistant to weather, such as snow and the sun may cover the panel and hinder some of its efficiency. Bifacial solar panels are also more durable than conventional panels.

Despite some advantages, there are many reasons why single-sided solar panels may be better for you than bifacial solar panels. Because bifacial panels are so unique, they often require additional work and equipment to function. Although they have a higher efficiency rating, they can still be more expensive for homeowners due to factors such as the ground mounting required to install panels vertically. There are other requirements, such as the needed sun tracking system.

Of course, its advantages are relatively obvious, we can from their own characteristics elaborate

Features of bifacial solar modules

1、The back can generate electricity. The back of the double-sided photovoltaic module can use the reflected light from the ground to generate electricity. 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. Double-sided photovoltaic modules can increase power generation by 8 to 10 percent on grass, and up to 30 percent on snow.

2, accelerate the winter component snow melting. When conventional photovoltaic modules are covered with snow in winter, if the snow cannot be cleared in time, the modules are easy to freeze in the continuous low-temperature environment, which not only seriously affects the power generation efficiency, but also may causes unpredictable damage to the modules. When the front side of the double-sided solar module is covered with snow, the back side of the module can receive the reflected light from the snow and generate electricity and heat, which accelerates the melting and sliding of the snow and can improve the power generation

3, bifacial solar panel. The backplane of a double-sided photovoltaic module is usually transparent glass, which can be called a double-glass module. The double glass module can reduce the consumption of the confluence box and cable in the 1500V photovoltaic system, and reduce the initial system investment cost. At the same time, since the glass water permeability is almost zero, it is not necessary to consider the output power reduction caused by water vapor entering the component-induced PID. Moreover, this type of module is more adaptable to the environment and is suitable for photovoltaic power stations built in areas with more acid rain or salt spray.

4、Installation direction and location are flexible. Because the front and back of the solar panel can be photogenerated, the power generation benefit is more than 1.5 times of the general component under the condition of vertical placement, and the influence of the installation direction is very small, suitable for the installation mode is limited, such as guardrail, sound wall, BIPV system and so on.

5、Special bracket forms required. The conventional form of the bracket will block the back of the double-sided photovoltaic module, which not only reduces the light on the back but also causes a series mismatch between the cells in the module, affecting the power generation effect. The bracket of the double-sided solar module shall be designed as a “mirror frame” to avoid obscuring the back of the module.

 

Factors affecting power generation of bifacial solar panel

  1. Influence of component lowest ground height on power generation

According to the current installation experience, the higher the height of the PV module above the ground, the more obvious the gain effect of the back. When the height of the PV module above the ground is 1.3M, the increase of the irradiance received by the back will slow down. If the support load, cost, maintenance, and other factors are taken into consideration, the height of the PV module above the ground should be between 0.7-1.2M

  1. Influence of ground reflectance on power generation

The back of the double-sided solar module can use the reflected light from the ground to generate electricity. 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.

 

Photovoltaic industry professionals have made an analysis, comparing the power generation situation of double-sided modules on the ground of snow, cement, yellow sand and grass. Through the analysis of annual power generation data, it is found that compared with the conventional component system, double-sided modules combined with the snow background have the largest power generation gain, followed by cement, yellow sand, and grass, which can increase the power generation by up to 30% on the snow. Grass can increase by 8 to 10 percent.

  1. Influence of component Angle on power generation

When installing, it is necessary to proofread the Angle and direction of the maximum solar radiation as far as possible. In most areas of the country, the installation Angle is generally -5 degrees on the basis of the local latitude, and the installation Angle is generally due south and slightly west. The lower the latitude is, the smaller the influence of the installation Angle is. In high latitudes, installation Angle has a great influence on one-day/short-term energy generation of solar modules, and the difference between single-day energy generation can be up to 1 time. In the high latitude area, the inclination Angle should be reduced on the basis of the above calculation

  1. Influence of component array spacing on power generation

From the current installation experience, the spacing of component arrays has an obvious influence on power generation. According to the calculation, the larger the space between the components, the more obvious the back gain effect will be. Considering the construction cost of the power station, the space between the components should be determined according to the project itself in the actual installation process.

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