DAS Solar has launched its steel-frame-based PV module
This module exhibits higher yield and tensile strength compared to aluminum-frame-based peers
The coating of zinc-aluminum-magnesium over the steel substrate makes the frame resistant to corrosion
In addition, these frames eliminate the need for specific module-to-module grounding holes and support elastic-based mounting clamps
DAS Solar, a China-based PV cell and module maker, has launched its latest high-strength steel-framed PV module, aiming to withstand ‘severe structural and environmental challenges’ in typhoon-prone coasts to arid desert applications.
The company emphasizes mechanical strength or rigidity, resilience to corrosion, and cost-effective installation as key features of this module.
It features a zinc-aluminum-magnesium coated steel frame, which helps it achieve up to 75% higher yield strength and 110% greater tensile strength, compared to a standard aluminum-based counterpart. This translates into up to 50% higher wind and snow load resistance, preventing structural deformation or cell microcracks in extreme environmental occurrences. The company states that this advancement ensures the structural alignment of modules in high-wind-prone regions where they are prone to frequent static and dynamic wind loads. The modules are also resistant to bending due to the downward mechanical force exerted by the accumulated snow in high-altitude regions.
This module’s steel frame, coated with zinc-aluminum-magnesium, also provides protection against potential corrosion due to oxidation in scratched surface areas that may occur during installation or handling. Calling it a ‘self-healing corrosion protection’, the company says exposed surface areas get sealed by forming a MgZn₂ film through a reaction between magnesium and zinc to prevent further oxidation. The company adds that this anti-corrosion ‘characteristic’ ensures module reliability in coastal regions with salt spray and humidity, or in desert regions with windblown sand.
The high electrical conductivity of the steel frame supports the use of elastic-based clamping structures, unlike standard mounting systems that need dedicated module-to-module grounding holes. This clamping also simplifies installation, reduces turnaround time, and reduces the cost of long-term maintenance.
On the performance side, this module supports higher bifacial power gain due to its ‘open-back structure’, compared to a standard aluminum frame-based module that has an obstructive ‘C-side’ frame. This modification increases bifacial gain by around 2.5%, enabling more reflected and diffused light to reach the rear cell surface.
The commercialization details of DAS Solar’s steel-frame-based modules are not yet publicly available.
