LONGi’s Hi-MO X10 series lightweight module has received TÜV Rheinland’s Grade AAA certification under the 2PfG 2992/08.24 standard
The module offers 4 advantages: lightweight, fast installation, enhanced mechanical durability
This module is commercially available and carries a product warranty of up to 15 years and a performance warranty of up to 30 years
Leading vertically integrated PV maker LONGi’s Hi-MO X10 series back contact (BC) module has received grade AAA certification from TÜV Rheinland Germany under the 2PfG 2992/08.24 standard.
This standard evaluates lightweight modules for flexibility and rigidity, categorizing them into 3 levels: AAA, AA, and A, with AAA indicating the highest degree of reliability.
According to the company, this module, weighing 7.2 kg/m², is up to 42% lighter than standard single-glass-based counterparts and is targeted at low-load-bearing roof applications. It eliminates the need to reinforce mounting structures and supports front-side clamp-based mountings that are compatible with standard tools. With its ease and speed of installation, the company claims the module helps save up to 34 working days on a 1 MW project, compared to reinforced-structure-based alternatives. LONGi also claims a saving of up to 10 days compared to adhesive-based flexible module installations, without specifying the reference project capacity.
Despite its reduced weight, the module was found to maintain mechanical durability through the integration of multiple mechanical customizations. The use of ‘high-strength’ front glass enhances surface rigidity and offers better protection against external impacts. The thickened aluminum frame improves the overall load-bearing capacity, helping the module withstand higher static pressure from wind and snow than its standard peers. In addition, its I-shaped reinforcing ribs, laminated at the backside, provide additional internal support, minimize flexing across the module surface, and reduce stress on the cells during installation. Meanwhile, its mortise-and-tenon frame connection, a mechanical interlocking structure at the module frame's corners, is derived from the traditional mortise-and-tenon joint used in woodworking and architecture. It enhances corner stability, limiting torsional deformation when the module is subjected to uneven forces. In addition, the BC cell’s lower reverse breakdown voltage characteristics bypass individual shaded cells rather than an entire substring of a standard half-cut PV module, and recover up to 70% potential power loss. The company also states that the module incorporates a thicker adhesive film to aid in humid environments, without sharing many details about this material.
On the performance side, this module has an average mass-production wattage of 560 W and an efficiency of up to 24.8%. While the company didn’t share the module’s dimensions, it claims a power density of 248 W/m².
LONGi introduced the Hi-MO X10 series lightweight module in May 2025, engineered for old factories, lightweight steel roofs, and other low-load structures. The company backs the product with a 15-year material warranty and a 30-year power warranty.