LONGi launches fire-resistant version of Hi-MO X10 module for rooftop PV market
Chinese solar manufacturer LONGi has unveiled a fire-resistant version of its Hi-MO X10 module, targeting safety concerns in the distributed solar sector. The new product was launched on March 9 during the 19th China International Solar Utilization Conference and Exhibition (SUCE).
According to the company, the module is built on LONGi’s Hi-MO X10 platform and incorporates its second-generation hybrid passivated back contact technology, known as HPBC 2.0.
The Hi-MO X10 series features a peak module efficiency of 24.8%, a power temperature coefficient of –0.26%/°C, and a 30-year product and performance warranty. The portfolio is primarily positioned for distributed photovoltaic applications.
Addressing rooftop PV fire risks
LONGi said the fire-resistant version was developed in response to growing safety concerns in China’s rooftop solar segment, particularly risks linked to hot spots and DC arcing that can trigger module-related fires.
The company noted that the product is designed not only to reduce the probability of ignition but also to slow or prevent flame spread if an external fire occurs.
The module retains the Hi-MO X10 series’ “three-defense” positioning — anti-ignition, anti-shading, and anti-dust — while integrating an additional fire-resistance package. Earlier, the Hi-MO X10 series received Class A certification for shadow resistance from TÜV Rheinland, highlighting its focus on limiting localized overheating under partial shading conditions.
Technical specifications
The fire-resistant module uses a 108 half-cell design and supports 1,500 V DC system architecture. It is available in power outputs ranging from 580 W to 630 W.
LONGi said the module achieves a maximum conversion efficiency of 24.8%, with average mass-production efficiency exceeding 24.5%. Its operating temperature range is listed as –40 C to +85 C.
The company described the safety design as a multi-layer architecture combining protection at the cell, string and module levels. Key features include a honeycomb-style current diversion structure intended to limit hot-spot formation, reinforced junction-box sealing and welding designed to reduce arcing risk, and the use of flame-retardant materials in encapsulation and junction-box components.
In addition, the module incorporates high-temperature-resistant front glass engineered to withstand prolonged flame exposure longer than conventional PV glass.
The product has obtained Class A fire certification from TÜV Rheinland at the full-module, mass-production level. LONGi said the module has also undergone performance and safety verification by the National Center of Supervision and Inspection on Solar Photovoltaic Products Quality (CPVT), as well as testing under the international standards IEC 61215 and IEC 61730.
The launch reflects a broader shift in China’s distributed solar market, where manufacturers are increasingly focusing on application-specific product differentiation rather than efficiency alone. New designs are incorporating features such as improved dust resistance, lightweight structures, enhanced shading tolerance and dedicated fire-resistant configurations.
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