Types of Solar Backsheet in Solar Panel

From solar cells to EVA encapsulants to backsheets, each solar panel material plays a relevant role in a PV module. By meaning, solar backsheets are the outermost layer of a solar panel that protects the solar cells against harsh environmental conditions. They are made from polymers or a combination of polymers.

They ensure that the panel remains electrically insulated and the longevity of the entire solar panel is dependent on this polymer film. The solar backsheet failure can lead to the failure of an entire panel, unexpected power shortage, and the safety of the entire PV module is questioned. It is not just a plastic film that is made from polymer, the entire functioning of the panel is dependent on it.

To understand more about the backsheet, browse through this blog for more conceptual clarity and to make a rightful decision on which types of solar backsheet you choose:

Types of Solar Backsheet

Polyvinyl Fluoride (PVF) Backsheets

PVF, also known as Tedlar backsheets. It offers exceptional weather resistance. This type of solar backsheet is ideal for various applications due to its reliability and durability.

Polyvinyl Fluoride (PVF) backsheets are also known for their exceptional durability, weather resistance, and moisture barrier properties. They offer excellent resistance against UV rays, humidity, and chemicals, ensuring long-term performance and protection for the solar panels.

These kinds of solar backsheets find applications in various environments due to their reliability and durability. They are used in both residential and commercial solar installations, especially in areas prone to harsh weather conditions or pollution.

Fluoropolymer Backsheets

Materials like ETFE (ethylene tetrafluoroethylene) provide resilience in harsh climates and polluted environments, making them suitable for challenging conditions.

Fluoropolymer backsheets are best in extreme weather conditions and polluted environments mainly in industrial areas. They exhibit high resistance to UV radiation, temperature fluctuations, corrosion, and chemicals, making them ideal for challenging settings.

Polyvinylidene Fluoride (PVDF) Backsheets

PVDF backsheets boast UV resistance, high mechanical strength, and excellent fire resistance. They are known for their durability and ability to withstand harsh outdoor conditions, making them suitable for commercial-scale solar panel applications.

PVDF backsheets are frequently used in larger areas of solar installations, such as commercial or utility-scale projects, where durability and long-term performance are crucial.

Polyester Backsheets

This type of backsheet is cost-effective which finds suitability in residential and small-scale installations, balancing affordability and reliability.

Due to their cost-effectiveness and moderate durability, polyester backsheets are commonly utilized in smaller solar panel setups, including residential rooftop installations or small-scale off-grid systems.

Each type of backsheet offers unique characteristics suited for various environmental conditions, project requirements, and applications. The choice of backsheet you make should depend on factors such as climate, expected lifespan, cost considerations, and the specific needs of the solar panel installation in your premise or area.

Factors Influencing Backsheet Choice

Considerations like climate, weather conditions, panel type, and anticipated lifespan influence backsheet choice. Tailoring the backsheet to specific project requirements ensures optimal performance.

How to Choose the Right Backsheet?

As discussed above, the choice of solar backsheet depends upon various factors like climatic conditions, longevity, expected lifespan, and on the area where the solar panel is going to be installed. Here’s a guide on how to make the right choice of the backsheet:

Environmental Conditions

If the PV installation area is prone to extreme weather conditions, such as high temperatures, humidity, pollution, or heavy rainstorms then opt for backsheets with excellent weather resistance like PVF/Tedlar or ETFE. These two backsheets are the best choice for harsh weather and also the purpose is commercial or industrial where the PV installation is in a vast area.

Durability and Longevity

Evaluate the expected lifespan of the solar panels. Backsheets like PVDF are known for their long-term durability and are suitable for commercial-scale installations where longevity is crucial.

Budget and Cost-effectiveness

Consider the project budget. Polyester backsheets offer a cost-effective solution for smaller-scale installations while still providing adequate protection.

Application Type

Determine the scale and purpose of the solar installation—residential, commercial, or utility-scale. Choose backsheets tailored to the specific requirements of each application. PVF and ETFE might be more suitable for harsh environmental conditions, while PVDF is commonly used in larger commercial setups.

Compatibility of Types of Solar Panel

Ensure the backsheet selected aligns with the type of solar panels being used. Different panel technologies may have specific compatibility requirements.

Reputation of Backsheet Manufacturer

Consider the reputation and reliability of the solar backsheet manufacturer. Reputable manufacturers often produce high-quality backsheets that meet industry standards and offer better performance.

Consultation and Expert Advice

Seek advice from the solar industry professionals. They can provide insights and recommendations based on your project’s unique needs and environmental conditions.

Performance and Efficiency

While durability is crucial, ensure the selected backsheet doesn’t compromise solar panel efficiency. Some backsheets may offer excellent protection but can reduce the panel’s efficiency due to increased reflectivity.

By carefully considering these factors and balancing performance, durability, and cost, you can choose the most suitable solar backsheet for your specific solar panel installation, ensuring optimal performance and longevity.

Conclusion

Selecting the right backsheet is pivotal in maximizing solar panel efficiency and lifespan. It’s imperative to weigh various factors and project requirements to ensure the best performance, durability, and reliability of solar panels. The solar backsheet produced by Vishakha catches the needs of application of both solar panel applications- residential and commercial and is the largest producer of PET, PVDF, and PVF backsheet in India. Contact us to join the journey of sustainability. Provide high-quality backsheet support to your PV modules with Vishakha Renewables.

Answering More Questions About Solar Backsheets

What is the difference between Pvdf and pet backsheet?

PVDF are fluoropolymer-based backsheets while PET is a non-fluoropolymer-based backsheet. Fluoropolymer backsheet has high performance; however, the production process is complex.

What is the material of the backsheet?

The backsheet is made from polymers or a combination of polymers such as EVA, polyester, or fluoropolymer

Which is better PTFE or PVDF?

PTFE has better performance, better sunlight transmission, and is comparatively higher in price. PVDF is more suited for non-aggressive and mild organic solutions. You can make choices according to your needs considering various factors of PV module installation.