What is a back contact solar panel?

A back contact solar panel is a type of photovoltaic solar panel that differs from conventional solar panels in the way that the photovoltaic solar cells are manufactured and arranged. In a back contact solar panel, the electrodes that collect the electrical current generated by the solar cells are located on the back of the cell, rather than on the front and sides as in a traditional solar panel. This configuration allows for a potentially higher electrical output per cell and an overall higher efficiency of the panel since there are fewer areas for energy loss or shading to occur.

Back contact solar panels are also known for their durability, as they don’t have any front-side wires that are vulnerable to breakage or corrosion. They are often used in special applications such as space satellites and outdoor equipment, where high efficiency and durability are important factors.

However, back contact solar panels may be more expensive to manufacture than traditional solar panels since they are built using more specialized manufacturing techniques.

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


What is an ETFE solar panel?

An ETFE solar panel is a type of solar panel that uses a lightweight and durable plastic called ETFE (ethylene tetrafluoroethylene) as its transparent cover material. ETFE is a fluoropolymer that is known for its toughness, high transparency, and corrosion-resistant properties. Compared to glass, which is a common material used in conventional solar panels, ETFE has a few advantages, such as being more flexible, lightweight, and able to withstand extreme temperatures and harsh weather conditions.

The use of ETFE enables the creation of flexible and thin-film solar panels that can be used in a wide range of applications, such as electric vehicles, portable chargers, and IoT applications etc. ETFE solar panels are also considered to be more aesthetically pleasing than traditional solar panels due to their translucency, which allows them to blend in more naturally with the surroundings.

Overall, ETFE solar panels are a promising technology that could open up new possibilities for solar power generation and integration in various industries.

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


Mono Solar Panel vs Poly Solar Panel

Which is better, polycrystalline silicon solar panels or monocrystalline silicon solar panels?

Both polycrystalline and monocrystalline silicon solar panels have their advantages and disadvantages depending on the specific application. Here are a few differences:

1.    Efficiency: Monocrystalline solar panels generally have a higher efficiency, as the manufacturing process produces more pure silicon that has a uniform look and consistent performance. Polycrystalline solar panels, on the other hand, use silicon fragments and have a lower efficiency.

2.    Space: Monocrystalline solar panels tend to have a higher power output per unit of space, making them a good option for installations with limited space. Polycrystalline solar panels require more space to generate the same amount of power, making them a good option for larger installations with ample space.

3.    Cost: Polycrystalline solar panels are generally less expensive to produce than monocrystalline solar panels, making them a more affordable option. However, as manufacturing processes improve, the difference in pricing has become less noticeable.

4.    Temperature and shading: Polycrystalline solar panels are better suited for installations with high outdoor temperatures and shading, while monocrystalline solar panels perform better under low light conditions.

Ultimately, the choice between polycrystalline and monocrystalline solar panels will depend on a variety of factors, including budget, space limitations, and performance requirements.

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


Source of origin: https://www.wsl-solar.com/Product_News/2023/0510/mono-solar-panel-vs-poly-solar-panel.html

What is an Amorphous Silicon Solar Cell ?

Amorphous silicon solar cells (a-Si solar cell) are devices that convert light energy into electrical energy through photoelectric or photochemical effects. Amorphous silicon cells are solar cells made of amorphous silicon thin films deposited on conductive glass substrates. This kind of solar cell features with low cost and good performance at weak light condition, it has been widely used in micro-low-power power supplies for indoor use, such as watch batteries, calculator batteries and self-powered wireless sensor etc . Welcome to watch this video to know more about a-Si solar cell.

Created by 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.


Manufacturer of Custom Solar Panels – WSL Solar

Many thanks to our employees for their hard work. Pay attention to every detail in the production process, such as wire welding, silicone molding, EL testing, measuring dimensions, etc. It is because of their carefulness and hard work that we can produce high quality solar panels.

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


What is the Difference Between Solar Photovoltaic Glass and Float Glass?

Photovoltaic glass is a special type of glass that converts sunlight into electricity by encapsulating solar cell modules in layers of glass. Usually low-iron tempered glass or double-layer glass is used, and the surface is coated with anti-reflection coating and transparent conductive layer.

Float glass is a common glass manufacturing process. In the production process, glass raw materials (such as silica sand, sodium carbonate, limestone, etc.) are melted, flowed out evenly from the top of the glass melting bath, and solidified into thin flake glass after cooling. This technique produces high-quality, uniform-thickness glass for a wide variety of applications.

The difference between photovoltaic glass and float glass is mainly reflected in the following aspects:

Different uses: Photovoltaic glass is mainly used in the manufacture of solar panels, while float glass is widely used in construction, automobiles and other fields;

Different materials: Photovoltaic glass usually uses special materials such as low-iron tempered glass or double-layer glass, while float glass is produced by using ordinary glass raw materials through special processes;

The manufacturing method is different: photovoltaic glass needs to be coated with anti-reflection coating and transparent conductive layer on the surface, and the solar cell module is encapsulated in it. Float glass, on the other hand, is made from thin sheets of glass by melting the raw material.

Different performance requirements: Photovoltaic glass needs to have certain special properties such as transmittance, reflectivity and wind pressure resistance, while float glass mainly requires uniform thickness, high strength and light transmission performance.

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

Comparative Analysis of Conversion Efficiency of Various Solar Panels

Considering factors such as conversion efficiency of solar panels, technical level, maturity of production process, market share, etc., for large-scale grid-connected photovoltaic power plants, the types of solar panels currently commonly used can be roughly divided into crystalline silicon solar panels and amorphous silicon solar panels. Crystalline silicon solar panels are further divided into monocrystalline silicon solar panels and polycrystalline silicon solar panels. Amorphous silicon solar panels are mainly thin-film solar panels. The following is a brief analysis of the conversion efficiency of various photovoltaic solar panels:

1. Monocrystalline silicon solar panels
Monocrystalline solar panels are the most common high-efficiency solar panels on the market today. The production process and technological breakthroughs of the single crystal industry chain determine that it has a more perfect crystal lattice, can better absorb light, and has a higher conversion efficiency. For monocrystalline solar panels, the efficiency of PERC high-efficiency monocrystalline solar cells has exceeded 23%, setting a world record. The conversion efficiency of ordinary monocrystalline solar cells is also above 19%, which is the highest photoelectric conversion efficiency among all types of solar cells.
With the continuous maturity of technology, the price of monocrystalline solar panels is almost the same as that of polycrystalline. Because monocrystalline silicon is generally encapsulated with tempered glass and waterproof resin, it is durable and its service life can generally reach 20 years, and the maximum can reach 30 years.

2. Polycrystalline silicon solar panels
Compared with monocrystalline solar cells, the silicon wafer of polycrystalline solar cells is a combination of multiple tiny single crystals, with a large number of grain boundaries in the middle, including many defects. It is actually a minority carrier recombination center, thus reducing the polycrystalline silicon. At present, the conversion efficiency of polycrystalline solar cells is about 18%-20%.

3. Thin film solar panels
After several years of rapid development, the laboratory efficiency of single-junction amorphous silicon thin-film solar cells can reach about 12.7%, and the laboratory efficiency of microcrystalline silicon multi-junction solar cells can reach 13.4%. The laboratory photoelectric conversion efficiency of solar cells can reach 16%, and the average efficiency of commercial solar cells is 8%-10%. The conversion efficiency of copper indium gallium selenide can reach 14%.

However, compared with crystalline silicon solar panels, the main problem of thin-film solar panels is the low photoelectric conversion efficiency, and the area of thin-film solar panels required to convert the same amount of electric energy is huge. In addition, thin-film solar panels also have the disadvantage of poor stability, and their energy conversion efficiency changes with the prolongation of irradiation time. These shortcomings are the biggest obstacles to the wide application of thin-film solar panels.
From the analysis of the conversion efficiency of the above three types of photovoltaic solar panels, it is not difficult to see that the conversion efficiency of crystalline silicon solar panels is significantly higher and more stable than that of thin-film solar panels. Monocrystalline silicon solar panels have significantly higher conversion efficiency and are more stable than polycrystalline silicon solar panels. For the selection of photovoltaic power plant components, it should be combined with the specific conditions of the project, and the corresponding technical and economic comparison analysis should be carried out to finally determine the best solar panel selection suitable for the photovoltaic power plant.

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

3W Solar Panel | Custom Solar Panel

Key Features:
– Utilize high efficiency mono PERC solar cell, up to 22.5% efficiency
– Laminated by tempered glass, rigid, durable and long lasting
– Waterproof, scratch resistant, and UV resistant
– Customized solar panels for industrial use

5V 3W Solar Panel

This custom shaped 3w solar panel utilizes high efficiency mono PERC solar cells with efficiency up to 22.5%, to ensure its high output. It is laminated by tempered glass to protect the solar cells inside, making it rigid, durable and long lasting. This rigid solar panel is waterproof, scratch resistant, and UV resistant, specially designed for long term outdoor use in any challenging condition.

Tempered glass solar panels are widely used in IoT applications, marine buoys, wireless sensors, traffic warning devise, GPS devices, asset tracking, electric fence chargers, outdoor lighting systems, weather monitoring systems etc.

  Solar Panel Specification

Item No.WSL-C029
Solar Panel Size155x155x4.5mm
Peak Power (Pmax)3.2W
Voltage at Pmax (Vmp)5V
Current at Pmax (Imp)640mA
Open Circuit Voltage (Voc)6V
Short Circuit Current (Isc)704mA
Solar Cell TypeMono PERC Solar Cell
Power Tolerance±5%
Encapsulation method3.2mm Tempered glass
Back sheetTPT
Product Warranty5 Years
Lead time25 Days
Storage temperature-40°C ~ 85°C
Working temperature-40°C ~ 85°C
Standard Test Conditions (STC)1000W/m2, 1.5AM, 25°C Cell temperature

Click here to watch the video of this type of custom solar panels. 

View More Custom Solar Panels

5V Solar Panels   |  6V Solar Panels   |  9V Solar Panels

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

Source of origin: https://www.wsl-solar.com/3w-solar-panel.html

Custom Solar Panel Construction

The construction of custom solar panels varies slightly depending on the lamination method and the materials used. The following is a brief introduction to the construction of tempered glass solar panels and ETFE solar panels.

1. Solar Panel Construction of Tempered Glass Solar Panels
Tempered Glass / EVA / Solar Cell / EVA / Backsheet

2. Solar Panel Construction of ETFE Solar Panels
ETFE film / EVA / Solar Cell / PCB

Tempered glass:
The role of tempered glass is to protect the solar cells, the selected photovoltaic glass must have high light transmittance (generally more than 91%), and requires ultra-white tempering treatment. The thickness of photovoltaic glass is either 3.2mm or 2.0mm. The most commonly used is the 3.2mm thick glass.

EVA is an important encapsulant material, which is used to bond tempered glass and solar cells. It is usually cut into a thin sheet that can be inserted at the front and rear of the solar cells. The quality of transparent EVA material directly affects the lifespan of the solar panel. Should EVA be exposed to the air, it will easily age and turn yellow, thus affecting the light transmittance of the solar panel, and power generation quality.
The thickness of EVA ranges from 3mm to 4.5mm; among them, 4mm and 4.5mm are used the most.

Solar Cell:
Solar cells convert sunlight into electricity via the photovoltaic effect. They are the core parts of solar panels. Generally speaking, the power of a solar panel is proportional to the area of the solar cell.

The function of the backsheet is to seal, insulate and waterproof. Therefore, the selected backsheet materials such as TPT and TPE must be resistant to aging.
The backsheet is available in white and black. The white backsheet is commonly used, but some clients choose to use the black backsheet in order to maintain the color consistency with the application product and to be aesthetically pleasing. 

ETFE Film:
ETFE film is a film used to protect solar cells inside solar panels. Its thickness is usually less than 0.2mm, making it thin and light. In addition, it has the characteristics of resistance to temperature changes, high light transmittance of up to 95%, high self-cleaning, corrosion resistance, and long service life.

IBC Solar Cell
ETFE solar panels adopt IBC solar cells (interdigitated back contact) with efficiency up to 24%, to achieve a higher power output in a limited area. Traditional solar cells achieve energy conversion by having front contacts in the cell, while IBC solar cells have the contacts on the rear side, instead of placing them in the front of the cell. This allows them to achieve higher efficiency due to reduced shading on the front of the cell, and also increases the aesthetics since no contacts are visible on the front. IBC solar cell technology also improves the temperature coefficient, which means an IBC solar panel can deliver a better performance in hot climate installations. It also has excellent performance under low light conditions.

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

Source of origin: https://www.wsl-solar.com/Product_News/2022/1212/Custom-Solar-Panel-Construction.html

High Quality Custom Solar Panel Manufacturer – WSL Solar

Quality is of paramount importance to us. To deliver outstanding quality solar panels while meeting highly customized demands for solar applications is the most import thing to us. From the selection of raw materials, through the process of manufacturing, to packaging and transportation; quality control is strictly implemented.

At WSL Solar facility, in-process inspection is an overall effort performed at each stage of solar panel manufacturing. We will conduct 100% visual inspection and performance tests of all custom solar panels before packaging and shipping.


custom solar panel - WSL Solar

customized solar panel - WSL Solar

custom shape solar panel - WSL Solar

custom size solar panel - WSL Solar