Winaico showcases 500 W back-contact solar module with 24.5% efficiency

Taiwanese solar module provider Winaico, a unit of technology company Win Win Precision Technology Co. Ltd, has launched a new back-contact (BC) solar module for rooftop applications.

“With a power density of 245 W/m², the new glass-glass module sets new standards in its performance class,” the manufacturer said in a statement. “This is made possible by the rear placement of the interconnects and slightly larger cells. As a result, the module is particularly well-suited to applications with limited roof space, where maximum energy yields and high aesthetic standards are required.”

The Back Contact Series module features 108 monocrystalline n-type bifacial half-cells and delivers a rated power output of 500 W, with a module efficiency of 24.5%. It measures 1,800 mm × 1,134 mm × 35 mm and weighs 25 kg.

The panel features an open-circuit voltage of 40.84 V, a short-circuit current of 15.18 A. Its temperature coefficient is -0.26%/C.

The module uses an ethylene-vinyl acetate / polyolefin elastomer / ethylene-vinyl acetate (EPE) encapsulation layer positioned between 2 mm highly transparent front glass and 2 mm partially black-printed rear glass, creating the series’ “Ultra Black” appearance. Winaico has also incorporated unspecified cell-level shading technology to reduce power losses caused by partial shading conditions.

As a bifacial module, the panel can generate additional electricity from rear-side irradiance, with the manufacturer stating that output can reach up to 600 W under optimal conditions with a 20% bifacial gain, depending on factors such as ground albedo and installation environment.

For mechanical durability, the module is equipped with a 35 mm black anodized aluminum frame designed to improve resistance against glass breakage. It has been tested for maximum mechanical loads of 5,400 Pa on the front side and 2,400 Pa on the rear side. The electrical design includes an IP68-rated junction box with three bypass diodes.

The module complies with IEC 61215:2021 and IEC 61730:2023 standards and has also passed anti-PID testing according to IEC TS 62804-1 as well as hail resistance tests. According to Winaico, the glass-glass construction and optimized cell layout help reduce the risk of long-term microcrack formation.

Winaico is offering the Back Contact Series with a 30-year product warranty and a 30-year linear performance warranty. The warranty conditions include a maximum first-year degradation of 1%, followed by annual degradation of no more than 0.35% from the second to the thirtieth year, guaranteeing at least 88.85% of the initial rated power after 30 years.

The manufacturer is also providing one year of comprehensive insurance coverage for the complete solar system as an additional measure to protect installers and system owners.