What is the power generation difference between the front and back sides of 850W N - type TOPCon Bifacial Double Glass PV module?
As a supplier of 850W N - type TOPCon Bifacial Double Glass PV modules, I am often asked about the power generation differences between the front and back sides of these advanced photovoltaic panels. In this blog, I will delve into the technical aspects of these differences and explain how they impact the overall energy production of the PV system.
Understanding the Basics of 850W N - type TOPCon Bifacial Double Glass PV Modules
Before we discuss the power generation differences, let's first understand the key features of 850W N - type TOPCon Bifacial Double Glass PV modules. The "850W" indicates the rated power output of the module under standard test conditions (STC). The "N - type" refers to the type of silicon used in the solar cells. N - type silicon has several advantages over P - type silicon, such as higher efficiency, better resistance to light - induced degradation (LID), and lower temperature coefficients.
TOPCon, which stands for Tunnel Oxide Passivated Contact, is a cutting - edge cell technology. It reduces recombination losses at the rear surface of the solar cell, thereby increasing the overall efficiency of the cell. The "Bifacial" feature means that these modules can generate electricity from both the front and the back sides. The "Double Glass" construction provides enhanced durability and protection for the solar cells, as the glass on both sides shields them from environmental factors like moisture, dust, and mechanical damage.
Power Generation from the Front Side
The front side of the 850W N - type TOPCon Bifacial Double Glass PV module is designed to capture direct sunlight. When sunlight hits the front surface of the module, the photovoltaic effect occurs within the solar cells. Photons in the sunlight are absorbed by the semiconductor material (silicon in this case), which causes electrons to be released and creates an electric current.
The efficiency of the front - side power generation is relatively high due to the N - type TOPCon technology. Under ideal conditions, the front side can achieve efficiency levels above 24%. However, the actual power output of the front side depends on various factors, including the intensity of sunlight, the angle of incidence, and the temperature. For example, in regions with high solar irradiance, such as deserts, the front - side power generation can be significantly higher compared to areas with lower sunlight intensity.
Power Generation from the Back Side
The back side of the bifacial module also has the ability to generate electricity. It captures the reflected and scattered sunlight from the ground or other surrounding surfaces. The amount of power generated from the back side depends on multiple factors. The albedo of the surface beneath the module is a crucial factor. Albedo is the measure of the reflectivity of a surface. Surfaces with high albedo, such as white gravel, snow, or light - colored rooftops, reflect more sunlight onto the back side of the module, resulting in higher back - side power generation.
Typically, the back - side power generation is expressed as a percentage of the front - side power generation. For 850W N - type TOPCon Bifacial Double Glass PV modules, the back - side power generation can range from 10% to 30% of the front - side power generation, depending on the specific installation conditions. In some cases, with optimal albedo and installation height, the back - side contribution can be even higher.
Factors Affecting the Power Generation Difference
There are several factors that contribute to the power generation difference between the front and back sides of the PV module.
1. Sunlight Availability
The front side receives direct sunlight, which is more intense and consistent compared to the reflected light received by the back side. Direct sunlight has a higher energy density, allowing the front - side cells to generate more electricity.
2. Albedo of the Surrounding Surface
As mentioned earlier, the albedo of the surface beneath the module has a significant impact on the back - side power generation. A low - albedo surface, such as black asphalt, reflects very little sunlight, resulting in a lower back - side power output.
3. Module Installation Angle and Height
The installation angle of the module affects both the front - and back - side power generation. An optimal installation angle can maximize the direct sunlight received by the front side and the reflected sunlight received by the back side. The height of the module above the ground also matters. A higher installation height can increase the amount of reflected light reaching the back side.
4. Shading
Shading can have a more severe impact on the front - side power generation. Even a small amount of shading on the front side can cause a significant drop in the overall power output due to the series - connected nature of the solar cells. In contrast, shading on the back side has a relatively smaller impact on the total power generation.
Benefits of the Bifacial Design
Despite the power generation difference between the front and back sides, the bifacial design of the 850W N - type TOPCon Double Glass PV module offers several benefits.
1. Increased Overall Power Output
The ability to generate electricity from both sides significantly increases the overall power output of the PV system. In a large - scale solar power plant, this additional power generation can translate into substantial economic benefits over the lifetime of the system.
2. Better Performance in Different Environments
Bifacial modules can perform well in a variety of environments. In areas with high albedo, such as snowy regions or deserts with light - colored sand, the back - side power generation can make up a significant portion of the total power output, enhancing the system's efficiency.
Comparison with Other PV Modules
When compared to other types of PV modules, such as Two Sided Solar Panels, 450W Bifacial, HJT Solar Panels, 310W Mono Solar Panel, and Solar Panel 670 Watt, the 850W N - type TOPCon Bifacial Double Glass PV module offers higher power output and better efficiency.
The N - type TOPCon technology provides better performance in terms of LID and temperature coefficients compared to some traditional PV technologies. The bifacial design also gives it an edge over single - sided modules in terms of overall energy production.
Conclusion
In conclusion, the power generation difference between the front and back sides of 850W N - type TOPCon Bifacial Double Glass PV modules is due to various factors related to sunlight availability, albedo, installation conditions, and shading. While the front side generates more power under normal circumstances, the back - side power generation can significantly contribute to the overall energy output of the PV system.
If you are interested in purchasing high - quality 850W N - type TOPCon Bifacial Double Glass PV modules for your solar project, please feel free to contact us for further discussions. Our team of experts is ready to provide you with detailed information and customized solutions.
References
- [1] Green, M. A., et al. "Solar cell efficiency tables (version 60)." Progress in Photovoltaics: Research and Applications 29.5 (2021): 394 - 404.
- [2] Jain, H., & Kapoor, A. "Bifacial photovoltaic modules: A review." Renewable and Sustainable Energy Reviews 101 (2019): 1029 - 1043.