With the accelerating reshaping of the global energy landscape

the photovoltaic (PV) industry

is emerging as a cornerstone of clean energy

Chinese PV enterprises

leveraging significant advantages in technology and 

are continuously releasing competitive advanced production capacity

Tongwei has launched a new generation of TOPCon modules

TNC 2.0

integrating 908 technology

(Tongwei's proprietary 0BB technology)

TPE technology, Poly Tech

and stencil printing—four core technologies

that comprehensively enhance the power generation performance of products across various scenarios

Today, we will delve into

one of the four core technologies of TNC 2.0: 908 technology

908 technologyWhat kind of cutting-edge technology does it conceal

and why does it further enhance module power generation capabilities?

Tongwei 908 Technology

Answers with the "Multiplication" of Efficiency Evolution

Traditional PV cells are covered with fine grid lines, which act like "capillaries" to collect the current generated by sunlight. This collected electricity needs to converge on thicker main grid lines before being transmitted to external circuits. In addition to its primary function of current transmission, the main grid must also accommodate the requirements of welding. This functional complexity necessitates that the main grid design balances conductivity and mechanical adaptability. Even with engineers repeatedly optimizing parameters such as main grid width and spacing, "shadowing areas" that limit efficiency improvements remain.

In the traditional era, main grids were thick and sparse, resembling a few major roads, causing significant shading and limiting efficiency. The multi-busbar era, with advancements in welding technology, increased the number of main grids to nine or more, resulting in thinner grid lines and reduced shading. The ultra-multi-busbar era saw further breakthroughs in welding technology, increasing the number of main grids to 16 or more, achieving less light obstruction and shorter current transmission distances.

Now, Tongwei's 908 technology has emerged. Through further breakthroughs in welding processes, it reduces the width of the main grid, gradually removing its welding function and restoring its original role as a "connecting wire." By shortening the grid line width and optimizing PAD points, the electrical performance of TNC 2.0 cells is improved. Simultaneously, a "highway network" composed of 24 connecting lines further shortens the current transmission distance, reduces resistance, and minimizes losses, significantly enhancing the system's power generation capacity of the modules.

Compared to conventional modules, TNC 2.0 modules using 908 technology can increase power generation by more than 0.5%. A 100 MW PV power station can generate an average of 1.34 million kWh more electricity per year, equivalent to the electricity consumption of 100 urban households for over five years.(Note: The TNC 2.0 module G12R 66 (650W) version, which applies 908 interconnection technology, is compared with a traditional module (620W) to construct a calculation model, using the 100MW Madrid project in Spain as an example, with a capacity ratio of 1.2, using a 320kW string inverter.)

Tongwei 908 Technology

Flexible Connection, Superior Composite Durability

The Achilles' heel of conventional photovoltaic (PV) modules may lie within the minuscule solder joints. Traditional soldering techniques rely on silver solder to connect circuits. These silver points are not only expensive but also obstruct incident light, thereby diminishing the light-harvesting efficiency of the module. Furthermore, the rigid connections of silver solder lead to stress concentration, which, under the combined stresses of high and low temperatures and load pressure, can easily foster risks such as microcracks and grid fractures, becoming "invisible killers" that restrict module efficiency and lifespan.

Today, Tongwei has achieved a significant breakthrough with a single drop of "glue." The 908 technology of the TNC 2.0 module replaces the majority of traditional silver solder joints with silicone adhesive dots, enabling greater light capture and a leap in power generation efficiency. The 908 technology innovatively employs "flexible connections." Typically, after the cells are soldered, residual stress always exists in the soldering area. The placement of solder joints is, to some extent, intended to release soldering stress and achieve better electrical connections.

The flexible adhesive dot connection adopted by Tongwei can further release stress and enhance the reliability of electrical connections. Silicone adhesive dots do not easily break down at high temperatures, with a thermal decomposition temperature exceeding 300°C. In low-temperature conditions, their molecular chain segments are in a highly elastic state, and the material exhibits rubber-like elasticity. Generally speaking, even in extremely high-temperature environments such as deserts, where the module surface temperature can approach 90°C, the silicone adhesive dots can still remain stable without softening or breaking. With a lower glass transition temperature, they can maintain a highly elastic state even in extremely low-temperature scenarios, avoiding material embrittlement and hardening.

The TNC 2.0 module, which uses silicone adhesive dot connections, exhibits superior composite resistance in high and low-temperature environments and stronger impact resistance. Currently, Tongwei has taken the lead in formulating industry standards, promoting the industry's upgrade towards high reliability and high efficiency.

Focusing on long-term power generation capacity

Tongwei TNC 2.0

with the "dual engines" of technological innovation and intelligent manufacturing

accelerates efficiency evolution

The power generation capacity per watt is significantly improved

allowing every ray of sunlight to realize higher returns

driving development with "sunlight" and promoting development with "green energy"