March 28, 2024

Solar Stringer Machine: Important Things to Know

The solar industry is growing rapidly because more and more people are looking for renewable energy sources. Solar panels are really important in this industry and they are made using special machines like stringer machines. A solar stringer machine is used to connect solar cells together using flat ribbons called busbars. These connected cells make up a solar panel. It can be tricky to learn how to use a solar stringer machine, especially for newbies in the solar panel business.

In this blog post, we will give you helpful information about solar stringer machines for anyone thinking about buying or using them.

How an Automatic Solar Stringer Machine Works?

An automatic solar stringer machine is a sophisticated piece of equipment that plays a crucial role in the production of solar panels. Here's a step-by-step breakdown of how it works: 

  • Solar Cell Loading: The process starts by putting solar cells into the machine. The solar cell stringer machine can use different types of solar cells, ranging from 166mm to 210mm, including full and half-cut cells.
  • Soldering Process: The solar cell stringer machine uses a method called IR soldering to connect the solar cells together to make strings. This process involves using bus bars to solder the cells together. The soldering is done automatically to reduce any strain on the cells, resulting in high-quality solar panels with fewer breakages.
  • Servo Motor Driving and Industrial CCD Positioning: The machine uses a special kind of motor and camera system to accurately place the solar cells. This technology can also automatically find and remove any faulty cells, so only the good ones are used.
  • String Formation: The machine puts together solar cells by welding them with copper ribbon one by one. The cells are connected in a row to make a string. This whole process is done automatically and can be done very quickly, with some machines able to work on 7000 cells in just one hour.
  • String Collection or Transfer: After the strings are made, they are either gathered or moved straight to the next step in making them. This is done using different high-tech machines like PLC, linear module, servo motor, dispensing system, curing unit, and discharging mechanism.
  • Versatility: Automatic solar cell stringing machine is versatile and can handle various solar cell technologies, from traditional crystalline to advanced HJT and PERC cell stringers. It can accommodate flat and round solar ribbons, making it a comprehensive solution for solar cell soldering and interconnection needs.

Importance of Solar Stringer Machine in PV Manufacturing

Solar stringer machines are really important in making solar panels. They help make sure that the solar panels are made efficiently, with good quality, and can be made in large quantities. Let's take a look at why they are so crucial:

Efficiency and Speed: Solar stringer machines, especially automatic ones, significantly increase the speed of production by automating the process of connecting solar cells into strings. This allows manufacturers to produce more panels in less time, meeting the growing demand for solar energy solutions.

Precision and Quality: These machines make sure that solar cells are soldered accurately and consistently, which is important for how well solar panels work and how long they last. Good connections lower the chance of problems and make the panels more reliable.

Cost-Effectiveness: By using solar stringer machines, companies can save money by reducing the need for manual labor. This saved money can then be used for other things like research and development or increasing production.

Scalability: Solar stringer machines help companies increase their production in a smart way. These machines are important for big factories that need to make a lot of solar panels to keep up with what customers want.

Main Things to Consider When Purchasing a Automatic Solar Cell Stringer Machine

When purchasing a solar stringer machine, there are several key factors to consider to ensure you're making the right investment for your needs: 

  • Usage and Production Volume: Consider how you plan to use the machine. If you're a large-scale manufacturer, you'll need a machine capable of handling high volumes of solar cells. Some machines can interconnect 2000-2500 solar cells per hour, while others can handle up to 7000 cells per hour.
  • Compatibility with Solar Cell Types: The machine should be compatible with all types of solar cells available on the market, from 166mm to 210mm, including full and half-cut cells.
  • Soldering Technology: The soldering technology used by the machine is crucial. Traditional soldering can reach temperatures of over 240 degrees Celsius in a matter of seconds, increasing the risk of cracking the cells. Some machines use hybrid soldering technology, combining traditional contact soldering with hot air, which can result in high-quality soldering with minimal breakages.
  • Machine Footprint: Consider the space available in your factory. Some machines have a small factory footprint, making them suitable for smaller operations.
  • Budget: When you're thinking about buying a sewing machine, make sure to think about how much money you have to spend. Fancy machines with lots of cool features might be really great, but they can be expensive too. So, it's a good idea to find a machine that is not only affordable but also does everything you need it to do.
  • Safety and Quality: Make sure the machine is approved as safe by a testing lab that is not connected to the company. The machine should also work well and be able to make good solar panels without breaking too often during the process.
  • Automation and Ease of Use: The machine should be fully automatic and easy to operate, optimizing the delicate phase of stringing and tabbing.
  • Support and Training: Consider the level of support and training provided by the machine supplier. Some suppliers offer installation and training, which can be beneficial, especially if you're new to using such equipment.

Remember, the right solar stringer machine for you will depend on your specific needs, including your production volume, the types of solar cells you work with, your budget, and the space available in your factory.

Solar Panel Stringer Machine FAQ's

1. What is the Lifespan of a Solar Stringer Machine?

The lifespan of a solar stringer machine depends on different things like how often it's used, how clean it is, and how accurate it is. If you take good care of it, the machine can keep working for a long time. You just have to replace some parts when they wear out.

2. What are the Activities that are performed daily, as a Maintenance Task, on a Solar Stringer Machine?

Daily maintenance tasks mainly include keeping the machine clear of dust, checking all still-connected wires, and ensuring that all the safety features are in working order. The manufacturer's manual can provide detailed information about the maintenance of your machine.

3. Is any Training Required for the Operator of a Solar Stringer Machine?

The level of training needed can vary from machine to machine depending on the complexity of the machine's operation. In most cases, manufacturers provide training for the operators, usually covering safe operation procedures, basic maintenance tasks, and troubleshooting common issues.

4. What are the Essential Requirements for the Use of the Solar Stringer Machine?

Regular maintenance is vital to ensure the flawless operation of your solar stringer machine. This includes regular cleaning, verifying the calibration of temperature regulators and other control devices, conducting regular inspections, and ensuring the availability of spare parts in case of component failure.

5. How does the String Arrangement Affect the Stringing Machine's Performance?

The electrical configuration (series or parallel connection) of the solar cells within a string connection will determine the programming and operation of the solar stringer machine. Modern machines can produce a wide variety of string patterns through programming.

6. What is the Typical Payback Period of the Investment into a Machine for Stringing Solar Panels?

The payback time depends on factors such as the initial investment cost, increased production capacity, and labor cost reduction. A payback period of a few years or less can be achieved if the efficiency of operation and output are high.

7. What are Troubleshooting Common Issues about Solar Stringer Machines?

Common issues include poor soldering quality, cell cracking, and machine downtime. Regular calibration and servicing can help eliminate errors and improve the accuracy of the machine.

8. What are the Types of Soldering Used in Solar Stringer Machines?

There are two major types of soldering used in solar stringer machines: Laser Soldering and Infrared (IR) Soldering. Laser Soldering provides precise heat management but is more expensive, while IR soldering is more economical but requires excellent control over the quality of the work.

9. What are the Future Trends in Solar Stringing Technology?

Future trends include increased automation, integration with smart manufacturing techniques such as real-time monitoring or predictive maintenance, and a focus on sustainability with energy-saving stringer designs and the use of ecologically friendly materials.


Solar stringer machines are really important when it comes to making solar panels. To choose the right stringer machine, you need to know what they do, what makes them special, and what to look for when picking one out. In this article, we answer some common questions to help you decide which stringer machine is right for you if you're thinking about buying one.

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