Vertical PV And Pre-commercial Tandem Modules From Huasun

At Intersolar Europe 2025, where the continent’s solar sector was on full display, Huasun Energy stood out with its innovations designed to address both current market pressures and long-term technology shifts. Speaking with TaiyangNews, Huasun’s Christian Comes offered a closer look at two strategic product developments that reflect the company’s continued leadership in heterojunction (HJT) technology.

Optimizing for Price Peaks: Vertical Bifacial HJT Modules

Huasun’s first highlight addresses a growing issue in mature PV markets – the steep midday drop in electricity prices due to oversupply from solar generation. “In markets like Spain and Germany, midday prices often fall to near-zero or even negative levels,” noted Comes. To counter this, the company proposes an intelligent system design: east-west vertical module installations.

Such configurations shift energy production to the early morning and late afternoon, when power prices tend to be higher. But the catch is, such an approach requires best-in-class bifaciality. Indeed, Huasun claims its Kunlun G12R module, with 22.5% efficiency and 570 W output, achieves 100% bifaciality and is among the absolute contenders for such vertical installations. This ensures that vertical systems can match the total energy yield of conventional south-facing arrays while generating electricity during more profitable periods. According to Huasun’s calculations, a vertical bifacial system in Germany, under current market conditions, can deliver around 20% more revenue for the same installed capacity. The advantage is rooted in both the superior bifaciality of HJT cells and their suitability for non-tilted, symmetrical light capture.

The Next Gen

The second innovation Huasun presented is a step toward the next generation of high-performance solar technology: HJT-perovskite tandem modules. In contrast to showing a prototype mini-module held in his hand at last year’s Intersolar, Comes drew our attention to a full-size module display at Huasun’s booth this year. Currently under pilot production, these tandem modules are projected to deliver power outputs exceeding 800 W and module efficiencies in the range of 27 to 28%. What sets this approach apart, according to Comes, is the manufacturing compatibility. “The tandem requires only a small additional step on top of existing HJT production, keeping costs comparable or even lower than today’s HJT modules.” This positions the solution as a scalable, cost-effective upgrade path once perovskite reliability meets long-term performance expectations. To that end, Huasun has already set up a dedicated pilot line to validate the reliability and performance of its tandem architecture. Iterative testing is ongoing, with commercial deployment targeted within the next 2 to 3 years, depending on the progress in stability improvements.