Lower Temperature Coefficient

What is Temperature Coefficient in Solar Panels?

The temperature coefficient of a solar panel is the percentage of power output lost per degree Celsius of temperature increase. The higher the temperature coefficient, the greater the power loss at high temperatures. The temperature coefficient is an important factor to consider when selecting a solar panel, as it will affect the panel’s power output in hot weather. What causes this to happen is that when temperature increases it increases the energy of the bound electrons disrupting the exciting state for the solar cells that results in a reduction of power in the solar panel output. However, the Temperature Coefficient in Solar Panels differs from one type to another. To understand more about the temperature coefficient, it is measured in percentage per degree Celsius so if a random solar panel has a temperature coefficient of 0.4%/ °C then if the surrounding temperature is 30 which is five degrees higher than the STC temperature we are talking of around 2% power decrease if it applied on a 10KW solar panel array the lost in power will be around 200W which is a noticeable decrease for solar power plants.

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What is the temperature coefficient of different types of solar panels?


  • Polycrystalline cells: Polycrystalline cells made from multiple silicon crystals have a temperature coefficient range from - 0.39 to 0.43 % /°C
  • Monocrystalline cells: Monocrystalline cells are made of single silicon crystals that have a temperature coefficient range from - 0.35 to 0.40 % /°C
  • Monocrystalline IBC cells: Monocrystalline Interdigitated Back Contact (IBC) solar cells have a temperature coefficient range from - 0.28 to 0.31 % /°C
  • Monocrystalline HJT cells: Monocrystalline heterojunction solar cells have a temperature coefficient range from - 0.25 to 0.27 % /°C

Which type of Solar Panel has the lowest temperature coefficient?

To achieve the lowest temperature coefficient the structure of solar cells has to have a higher excitation resistance for its bound electrons to prevent it from excitation when the temperature increases. Therefore, the Monocrystalline HJT solar panels have the lowest temperature coefficient of - 0.25 to 0.27 % /°C making them not only suitable for high-temperature areas but also making them more efficient in real output power.  

What is a Lower Temperature Coefficient?

In the ever-evolving world of solar energy, solar installers, procurement managers, and EPC (Engineering, Procurement, and Construction) professionals must stay abreast of the latest technological advancements. One such vital aspect is the temperature coefficient of solar panels, and particularly, the "Lower Temperature Coefficient" feature. In this comprehensive guide, we will delve into what exactly a Lower Temperature Coefficient is, its benefits, the techniques employed by solar manufacturers to incorporate this feature, its various applications, and how to verify whether a solar panel possesses this critical attribute.

Benefits and Advantages of Lower Temperature Coefficient

Improved Energy Output

Solar panels generate electricity by converting sunlight into electrical energy. However, they are sensitive to temperature variations. As the temperature of a solar panel increases, its efficiency tends to decrease. This phenomenon is well known as the temperature coefficient, which quantifies the panel's efficiency loss as a function of temperature rise.   A Lower Temperature Coefficient implies that the panel's efficiency loss is minimal with increasing temperature. In practical terms, this translates to a solar panel maintaining a higher level of energy output on hot days, ensuring that your solar installation continues to perform optimally in varying weather conditions.

Enhanced Durability

Solar panels are designed to withstand the rigors of outdoor exposure, but they still experience temperature fluctuations over their operational lifetime. Panels with a Lower Temperature Coefficient are better equipped to handle these variations, resulting in improved durability and longevity. Reduced heat-induced stress on the solar cells can help extend the overall lifespan of the solar panel.

Increased Energy Harvesting in Real-World Conditions

Real-world conditions aren't always ideal. Solar panels are subjected to varying temperatures, especially in regions with extreme climates. Solar panels with a Lower Temperature Coefficient can harvest more energy in these challenging conditions. This can be particularly advantageous for solar installations in locations with high temperature differentials, such as deserts or areas prone to temperature fluctuations.

Cost Savings

A solar panel with a Lower Temperature Coefficient can lead to cost savings in the long run. By maintaining higher efficiency even in high-temperature environments, you'll need fewer panels to achieve your desired energy output. This reduces the upfront costs of your solar installation, as well as the ongoing maintenance expenses, making solar energy even more financially attractive.

Techniques Employed by Solar Manufacturers to Build the Lower Temperature Coefficient Feature

The development of a solar panel with a Lower Temperature Coefficient involves several advanced techniques. Solar manufacturers invest heavily in research and development to create panels that can perform well in a variety of environmental conditions. Here are some of the key techniques employed:

Advanced Cell Materials

Solar cell materials play a pivotal role in determining a panel's temperature coefficient. By using advanced cell materials that are less sensitive to temperature changes, manufacturers can significantly reduce the temperature coefficient. Some of these materials include:  
  • Monocrystalline Silicon: Known for its high efficiency and low-temperature coefficient, monocrystalline silicon cells are a preferred choice for panels that need to operate in extreme conditions.
  • Polycrystalline Silicon: Polycrystalline cells have made great strides in recent years, offering improved temperature coefficients and cost-efficiency.

Enhanced Bypass Diodes

Bypass diodes are essential components of a solar panel, especially in shading or mismatched conditions. By enhancing the design and quality of bypass diodes, manufacturers can mitigate the impact of temperature-related efficiency losses. This results in a lower temperature coefficient and better performance under varying shading conditions.  

Optimized Encapsulation Materials

The encapsulation materials used to protect the solar cells from environmental factors can also influence the temperature coefficient. High-quality encapsulants with superior thermal properties can help maintain panel efficiency even when exposed to high temperatures.  

Improved Back Contact Design

The back contact design of solar cells has a significant impact on their temperature performance. By optimizing the design of the back contacts, manufacturers can reduce resistance and heat buildup within the panel, leading to a lower temperature coefficient.  

Applications of Solar Panels with Lower Temperature Coefficient

Solar panels with a Lower Temperature Coefficient find application in a wide range of scenarios where temperature fluctuations can affect energy production. Here are some notable applications:

Residential Solar Installations

For homeowners, having solar panels with a Lower Temperature Coefficient can ensure consistent energy generation throughout the year, even in regions with hot summers. This is especially beneficial for those who want to maximize the energy savings from their residential solar installations.

Commercial and Industrial Solar Projects

Businesses and industrial facilities often rely on solar energy to reduce their operational costs. In such applications, solar panels with a Lower Temperature Coefficient provide a reliable source of energy and help companies meet their sustainability goals, even in regions with extreme temperature variations.

Utility-Scale Solar Farms

Large-scale solar farms, which generate power for the grid, are increasingly adopting solar panels with a Lower Temperature Coefficient. These panels ensure consistent energy production, making them suitable for utility-scale projects that need to meet contractual obligations for energy supply.

Off-Grid and Remote Installations

Off-grid and remote installations, such as those used for telecommunications or water pumping, benefit from the reduced sensitivity of solar panels to temperature changes. These installations often have limited maintenance access, and having panels with a Lower Temperature Coefficient ensures stable energy production.  

How to Check Whether a Solar Panel has a Lower Temperature Coefficient Feature

Identifying whether a solar panel has a Lower Temperature Coefficient feature is crucial when procuring panels for your projects. Here's how you can verify this important attribute:  

Consult the Manufacturer's Specifications

The most straightforward way to determine a panel's temperature coefficient is to consult the manufacturer's specifications. Reputable manufacturers provide detailed information about their panels, including the temperature coefficient. Look for specifications that indicate the temperature coefficient in percentage per degree Celsius (°C) or per Kelvin (K). The lower this value is, the better the panel's performance in high temperatures.

Inquire with Your Solar Supplier

Your solar supplier or distributor is a valuable resource for information about the panels they offer. They can provide details about the panels' temperature coefficients and help you choose the right panels for your specific project requirements. Be sure to ask for documentation to confirm the temperature coefficient values.

Check Independent Testing Reports

Independent testing reports and certifications can also provide information about a solar panel's performance, including its temperature coefficient. Organizations like the National Renewable Energy Laboratory (NREL) often conduct testing and publish reports on various solar panels. These reports can be a valuable resource for making informed decisions.

Consult with Solar Experts

Engaging with experts in the solar industry, especially those with experience in solar panel technology, can be highly beneficial. They can provide insights, share their experiences with different panels, and help you choose the best option for your project.

Utilize Online Tools and Databases

Several online tools and databases are dedicated to helping you compare solar panels based on various parameters, including the temperature coefficient. Websites and apps that allow you to input panel specifications can provide recommendations based on your project's needs.   In conclusion, the Lower Temperature Coefficient feature in solar panels is a critical factor for ensuring consistent energy production, increased durability, and cost savings. As a solar installer, procurement manager, or EPC professional, being aware of this feature and how to verify it can help you make informed decisions when selecting panels for your solar projects. With the right panels in place, your solar installations can thrive in a wide range of environmental conditions, making solar energy a more dependable and sustainable source of power.