Advantages and Disadvantages of Epoxy Solar Panel

Epoxy Solar Panel is a kind of solar panel, but the encapsulation method is different. The solar cell is cut into small pieces by using a laser cutter to make the required voltage and current, and then encapsulated. Due to the small size, the encapsulation method such as glass laminated or PET laminated solar panel is generally not used, but the solar cell sheet is covered with epoxy resin and bonded with the PCB circuit board.

6V Solar Panel (Epoxy) for Solar Lighting

Application notes

The size of the solar panel can be customized according to the size required by the customer. The working voltage and working current can be customized. Generally, the epoxy solar panel is used to charge the battery of solar charger, solar light, toy and other small solar application electronic products. The working current is measured in the simulated standard light intensity. The standard test conditions are 1000 W/M 2, 25 ° C, and AM 1.5 conditions. The voltage and current emitted will change with the light intensity of the day. In sunny days, the power generated by the solar panel can be calculated in 4 hours.

Product Usage

Epoxy solar panel is an accessory for solar products. It can charge battery or directly connect load. It can be used in solar lawn light, solar floor lamp, solar garden lamp, solar charger, solar street sign, solar road stud, solar traffic sign, solar flashlights, solar toys and other small electrical products. Medium or large-size solar panels are generally encapsulated in a laminate way. Only solar panels with too small size and a power of only a few watts will be made into epoxy solar panels. Because laminated solar panels have a longer life than epoxy solar panel.

Advantages and Disadvantages of Epoxy Solar Panel

The epoxy solar panel has the characteristics of high production speed, pressure and corrosion resistance, beautiful appearance and low cost.

However, its disadvantage is that the lifespan of the epoxy solar panel is shorter than that of laminated solar panels, and usually the lifespan is only about one year. If it is often exposed to the outdoors, the surface of the epoxy solar panel will become whitish and yellow, which affects the appearance. Therefore, if you want a long-life solar panel, you better choose glass laminated solar panels, ETFE or PET laminated solar panels. 

Editor: Carrie Wong / WSL Solar

WSL Solar has been a quality and professional manufacturer of custom solar panels and solar solution provider in China since 2006. 

https://www.wsl-solar.com

What’s the Construction of a Small Custom Solar Panel?

A solar panel is a device that converts solar energy into electrical energy. Since solar panels can be customized flexibly, small custom solar panels have been applied to many off-grid solar applications, such as solar chargers, solar attic fans, and solar LED lights etc.

Usually the solar panels we see are a complete piece of panel, but do you know what the internal structure of the solar panels is?

Small Custom Solar Panel

Here, we mainly introduce the crystal silicon solar panels that are more common on the market as an example.

The structure of crystalline silicon solar panels is usually: tempered glass / EVA / solar cell / EVA / backsheet.

Solar Panel Construction

(1) Tempered glass: Its function is to protect the main body of power generation (such as solar cells). The choice of light transmission is required:

1. The light transmittance must be high (generally 91% or more); 2. Ultra-white tempering treatment.

(2) EVA: Used to bond fixed tempered glass and solar cell. The quality of transparent EVA material directly affects the life of solar panels. EVA exposed to air is prone to aging and yellowing, thus affecting the light transmission of solar panels, so then, affecting the power generation quality of the solar panels. In addition to the quality of the EVA itself, the influence of the lamination process of the custom solar panel manufacturers is also very large. For example, if the EVA adhesiveness is not up to standard, the bonding strength of EVA and tempered glass and backing plate is insufficient, which will cause EVA early aging, thus affects solar panel’s life.

(3) Solar Cell: Solar cells are the core components of solar panels. The main function of solar cell is power generation. 

(4) Back sheet: Its function is sealed, insulated and waterproof. Generally, materials such as TPT and TPE must be resistant to aging. Most solar panel manufacturers are guaranteed for 25 years. Tempered glass and aluminum alloys are generally no problem. The key is whether the back sheet and silica gel can meet the requirements.

 When the solar cell is soldered, the next step is to laminate, according to the following sequence, tempered glass / EVA / solar cell / EVA / back plate, stacked, and then sent to the laminator for vacuuming, and high temperature lamination. EVA is solid at room temperature, but when EVA is exposed to high temperatures, it becomes liquid. Therefore, in the laminator, after the EVA is melted into a liquid state, the solar cell sheet and the tempered glass and the back sheet are glued together.

Just after laminating from the laminator, usually on the four sides of the solar panel, there is some excess EVA overflow, which requires a knife to cut and burr. After processing, a complete solar panel is produced.

Editor: Carrie Wong / WSL Solar