Solar Panel Encapsulation: a key component you may ignore

· About Solar Panels,PV Technology News

What is solar panel encapsulation? What does it do?

Encapsulation films for solar panels primarily consist of EVA, POE, and PVB (polyvinyl butyral).

Solar Panel encapsulation adhesive film is one of the key materials of the Solar Panel module and is placed between the glass of the Solar Panel module and the solar cell or the back sheet and the solar cell to encapsulate and protect the solar cell.

broken image

How many different types of solar panel encapsulation films?

EVA: EVA resin is the main raw material, and it is modified by adding a cross-linking agent, a silane coupling agent, a light stabilizer, an antioxidant, an ultraviolet absorber, and other additives before being formed by melt processing.

It has high light transmittance and a wide process window, and because EVA resin and additives are polar, it has good compatibility and absorption.

EVA

POE: POE resin is used as the primary raw material, which is then modified by the addition of a crosslinking agent, a silage coupling agent, a light stabilizer, an antioxidant, an ultraviolet absorber, and other additives before being formed by melt processing.

Although it has excellent water vapor barrier and anti-PID performance, because POE is a non-polar resin, it is prone to additive precipitation.

POE:

PVB: PVB resin is the main raw material, and it is modified with plasticizers, silane coupling agents, light stabilizers, antioxidants, ultraviolet absorbers, and other additives before being formed by melt processing. Has a high mechanical strength.

PVB

EPE: EVA and POE melt-processed co-extrusion film.

Transparent film: Transparent film comes in two varieties: high-transparency and UV cut-off. The high-transparency type can pass through full-band sunlight to maximize solar energy conversion efficiency. The UV cut-off type absorbs ultraviolet rays, which can effectively improve the aging of materials caused by UV rays.

White film: a non-woven composite structure and a pre-crosslinked white film that is primarily colored with titanium dioxide. The white film with a non-woven composite structure has a good cushioning effect, anti-spill glue effect, and zero depth reflection, which improves power gain.

By adjusting the initial degree of crosslinking, the pre-crosslinked white film can control the whitening, wrinkling, and reflectivity of overflowing glue.

Single-layer structure adhesive film: refers to pure EVA, POE, or PVB adhesive film.

Multi-layer composite structure adhesive film:​ The term "multi-layer composite structure adhesive film" refers to a white film and EPE co-extruded adhesive film made of EVA, POE, and non-woven fabric.

Frosted film: anti-sticking and non-slip frosted film on the front and back sides.

Prism-shaped film: The steel roller's surface is a film with regular prismatic patterns that is anti-sticking and non-slip, and is suitable for high-weight film.

Casting film: The film is formed and processed by casting. Currently, the Solar Panel encapsulation film is primarily processed and formed through casting. The cast film is soft and fluid, with little internal stress and shrinkage.

Calendered film: a film created through the process of calendering. Calendered film has a high mechanical strength, hardness, internal stress, and flatness.

Thermosetting adhesive film: A network structure is formed through a chemical cross-linking reaction at a specific temperature and time to produce an adhesive film with mechanical strength, bonding and sealing effect. EVA is a thermosetting film, whereas POE comes in two varieties: thermosetting and thermoplastic. The thermosetting adhesive film is primarily intended for encapsulating traditional crystalline silicon Solar Panel modules.

Thermoplastic film: A hot-melt, non-chemically cross-linked film with no added peroxides. It has the properties of recyclable use and repeated processing. PVB is a thermoplastic film that is primarily used in BIPV (Building Integrated Solar Panel) modules. Thermoplastic POE is primarily used in thin-film solar panel modules.

For which different types of solar panels are different Encapsulation suitable?

Ordinary crystalline silicon modules are frequently encapsulated with EVA film. The front panel of single-glass modules is made of high-transmittance EVA film, while the back panel is made of UV-cut EVA film.

The front and back of the double-glass module are both made of high-transparency POE film. Thin-film modules are commonly encapsulated with PVB film, UV cut-off POE film, and thermoplastic POE film. Maysun's double glass products are coated with POE film; click on the product for more information.

530W-550W Double Glass PV Modules PERC 182mm 144 cells

What is the significance of solar panel encapsulation?

As the core material of Solar Panel modules, Solar Panel encapsulation adhesive film is critical to the encapsulation process and module performance.

The working environment of Solar Panel modules is primarily outdoors, where they are frequently exposed to sunlight, rain, ice, and snow, and the warranty period of Solar Panel modules is typically more than 25 years.

As a result, encapsulation technology is constantly improving in terms of matching characteristics and materials, process adaptation, performance requirements, and reliability assurance.

How does the Solar Panel Encapsulation ensure that the Solar Panel works properly?

Keeps light and electricity flowing by keeping moisture out: Moisture and dust that collect on solar cells can block sunlight and disrupt electricity flow. Encapsulation protects against moisture and dust by providing a protective cover.

Maintains the structure of the Solar Panel: Encapsulation protects the Solar Panel from deformation and ensures its integrity. It protects the delicate solar cells from damage and degradation over time.

To keep Solar Panels working: Proper encapsulation is critical for a Solar Panel's performance and lifespan. It acts as a shield for the sensitive solar cells and electrical components, allowing them to perform at their best.

Ensure the dependability of solar panels: Module warranties of more than 25 years have stringent performance degradation and material aging requirements.

The PID effect reduces the module's power, and the easy entry of water vapor causes the hydrolysis reaction of the EVA film to generate acetic acid, which reacts with the alkali precipitated on the glass surface to produce a large number of freely mobile Na ions, which move to the cell's surface under the action of an external electric field. PID effect is produced by enriching the anti-reflection layer.

Note:

What exactly is the PID effect?

PID effect: Water vapor and high temperatures reduce the volume resistivity of the adhesive film, accelerating corrosion of the battery ribbon and leading to PID attenuation and component aging.

PID effect

IEC/TC82 (International Electrotechnical Commission Solar Solar Panel Energy System Standardization Technical Committee) created and published a set of standards known as IEC62788 "Material Test Procedures for Solar Panel Module Encapsulations." Maysun Solar Panels has been focusing on the production of high-quality Solar Panel modules with international standard encapsulations since 2008.

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