LONGi bifacial glass-glass modules - double the light yield, double the resistance


The glass-glass modules with bifacial technology from LONGi Solar combine high energy yields with a robust design - ideal for PV projects with high demands on service life, stability and yield optimization. Thanks to the bifacial cell layout, they can convert not only direct sunlight but also reflected light from the back into electricity. The double-sided glass structure also protects the cells from environmental influences, resulting in less degradation and greater reliability in the long term.

The modules belong to the n-type TOPCon solar module category and are particularly suitable for ground-mounted systems, rooftop systems with reflective surfaces or systems with an east-west orientation.

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Technologies in detail

With bifacial cell technology and a robust glass-glass structure, these modules from LONGi focus on maximum energy yield and durability. The combination of both technologies not only ensures higher yields through backlighting, but also protects the cells permanently from the effects of the weather - ideal for demanding PV projects in the commercial and ground-mounted sectors.

Bifacial cell technology

  • Additional energy yield: rear-side yields of up to 25 % depending on the substrate and installation situation (e.g. gravel, foil, concrete).

  • Higher overall efficiency due to additional light absorption on the back of the module.

Glass-glass structure

  • Double-sided glass structure (e.g. 2.0 mm + 1.6 mm): Protection against micro-cracks, UV radiation and moisture.

  • Long-term yield security: Lower degradation (0.40 % p. a. from year 2) and 30-year linear performance guarantee.

  • High load capacity: snow load up to 5400 Pa, wind load up to 2400 Pa, certified to IEC/UL.

Technological highlights at a glance

  • n-type or p-type cell structure depending on series

  • Module efficiency up to 22.5 % (LR5-54HTD) or up to xx % (LR5-72HGD)【xx if unclear】

  • SMBB technology for reduced resistance and even current distribution

  • Power tolerance: 0 to +3 %

  • IEC-certified and compatible with common inverters

Available series with this technology


LONGi currently offers bifacial glass-glass modules in the following technical series:

  • LR5-54HTD - Compact design (54 cells), up to 440 Wp, especially for residential and commercial roofs

  • LR5-72HGD - Large-format version (72 cells), up to 590 Wp, ideal for ground-mounted systems and large-scale projects

Suitable for which projects?


The combination of bifaciality and glass-glass construction is particularly suitable for

  • Ground-mounted systems with reflective surfaces

  • Industrial and commercial roofs with high availability of space

  • Projects with a focus on longevity and low degradation

  • Systems that need to deliver a stable yield even in diffuse light

Discover more LONGi solar technologies


LONGi offers a broad portfolio of high-performance modules - tailored to a wide range of requirements:
Discover more about glass-glass technology and bifacial technology and find the ideal product for your project.