The Evolution of Photovoltaic Module Dimensions in China

The Evolution of Photovoltaic Module Dimensions in China: From Round Wafers to Industry Standardization Driven by "Container Fit"

China's photovoltaic (PV) module industry has undergone a development journey from early exploration to standardized mass production, followed by diversified innovation, and finally moving towards renewed standardization. The latest development indicates that leading manufacturers have reached a consensus on product dimensions, signaling a new phase of industrial synergy.

Early Stages: Circular Design Constrained by Materials

The origin of China's PV modules can be traced back to the 1980s. The initial products all utilized a monocrystalline structure. Because the original silicon ingots were cylindrical and to conserve materials, the industry directly used round silicon wafers to manufacture cells and modules, forming the distinctive product profile of that era.

The Standardization Process: From 125mm to the Rise of Polycrystalline

As the industry developed, monocrystalline products first achieved standardization, with the 125mm x 125mm wafer size becoming mainstream. Subsequently, due to rising monocrystalline prices, the more cost-competitive polycrystalline technology rapidly gained prominence and spurred the vigorous development of thin-film technology. Although thin-film and crystalline silicon routes once competed fiercely, crystalline silicon ultimately prevailed, with polycrystalline products dominating the market for an extended period.

The Return of Monocrystalline and Size Expansion

Around 2016, driven by technological advances and cost reductions, monocrystalline products returned to the mainstream, with their prices gradually becoming comparable to polycrystalline products. During this period, the 156mm x 156mm wafer size became the industry standard, and the corresponding module size (approximately 1.65m x 0.99m) long dominated the market.

Afterwards, to increase power output and efficiency, various manufacturers successively introduced larger modules, leading to a lack of uniform specifications in the market. Currently, the largest mass-produced module power has reached 760 watts, with dimensions of approximately 1.3 meters in width and 2.4 meters in length, an area close to the size of a table tennis table.

Unification Driven by Logistic：Although technology allows for even larger sizes, the practical requirements of logistics and transportation—particularly container loading efficiency—became a key limiting factor. This real-world constraint, however, has driven the industry towards dimensional unification.

Recently, nine leading domestic module manufacturers jointly established the mainstream product size as 1134mm x 2384mm. This specification, optimized for container transport, is expected to become the industry's common standard in the near term, putting an end to years of disparate sizing and laying a new foundation for the scaled and efficient development of China's PV industry.