High‑Current Module Junction Box Certification: Suzhou Tongtai New Energy has obtained the DEKRA Seal certificate for a 30‑A rated, three‑piece photovoltaic junction box, supporting 166/210 mm large‑wafer modules.

Release date:

2020-04-21 16:18

With the launch of large‑wafer cells and modules—such as 166 mm and 210 mm—photovoltaic module power can now reach up to 500 W, bringing us one step closer to grid parity.

However, increasing the silicon wafer area not only boosts efficiency and power output but also leads to a continuous rise in internal current. Recently, Suzhou Tongtai New Energy Technology Co., Ltd. obtained DEKRA’s world‑first DEKRA Seal certification for a three‑piece photovoltaic junction box with a rated current of 30 A.

This three‑piece junction box integrates a next‑generation modular system, delivering excellent thermal management even under high currents—far exceeding the conventional 18 A—and demonstrating particularly outstanding heat dissipation. The product not only complies with the IEC 62790:2014 standard for junction boxes but also significantly outperforms traditional PV junction boxes in terms of performance and reliability, elevating the operational safety and reliability of photovoltaic modules—especially those featuring large 166/210‑mm silicon wafers, TOPCon, HIT, and bifacial cells—by an additional level.

Mr. Bai Chengli, Director of Solar Energy Services for DEKRA East Asia and South Asia, stated: “Suzhou Tongtai New Energy Technology Co., Ltd. boasts a professional team dedicated to the development and design of modular junction boxes. The newly launched 30A-rated junction box product is better equipped to meet the demands of large‑wafer, high‑current modules, ensuring their long‑term reliable operation. Moving forward, we plan to deepen our collaboration with Tongtai New Energy, helping domestic PV companies maintain their global leadership.”

Mr. Tai Xiaojun, General Manager of Suzhou Tongtai New Energy Technology Co., Ltd., stated: “Achieving grid parity at low cost is a shared goal for the entire photovoltaic industry. Recently, increasing silicon wafer sizes has indeed led to substantial reductions in module costs; however, this approach has also introduced additional compatibility challenges—for instance, conventional junction boxes have low current ratings, making it difficult to ensure the reliable operation of high‑current modules. To address these industry pain points, Tongtai has assembled an R&D team that is comprehensively strengthening its core competitiveness—spanning power device design and manufacturing, as well as the development of corresponding junction box applications—so that modules equipped with large‑size wafers such as 166 mm or 210 mm can continue to operate reliably over the long term.”

About Suzhou Tongtai New Energy Technology Co., Ltd.

Suzhou Tongtai New Energy Technology Co., Ltd. was established in April 2013 and is a manufacturer of modular junction boxes. Since its inception, the company has been dedicated to the research, design, and production of Reliable-Box photovoltaic bypass‑integrated junction boxes, with the mission of ensuring module safety and reliability. It has successfully disrupted and set the trend in junction box technology. To date, the company holds more than 70 invention and utility‑model patents for modular junction boxes, including five international patents. Since their market launch, its products have received consistent acclaim from customers both domestically and internationally. The company has forged strong partnerships with numerous globally renowned module manufacturers, contributing meaningfully to the development of the photovoltaic industry. 。