Hi-MO X10 Guardian Fire-Resistant combines HPBC 2.0 back contact technology with a reinforced junction-box design, fire-resistant glass and flame-retardant materials to address two critical dimensions of PV fire safety: reducing potential ignition sources and limiting fire propagation.
PV-related fires are statistically rare. European Commission data citing findings from Germany and the Netherlands puts the incidence of fires caused by PV systems at 0.006–0.014%. For commercial and industrial buildings, however, the potential consequences can be significant when valuable equipment, inventory or critical operations are located beneath the PV installation.
A rooftop PV fire can have different origins. Some risks arise within the electrical system, while others originate outside the PV installation and expose the modules to fire.
Partial shading from leaves, dirt, snow or surrounding structures can cause individual cells to heat up significantly. Repeated or prolonged hot spots can damage module materials and increase fire risk.
Faulty, loose or ageing connections can cause DC arcing and intense localized heat.
Combustible materials, debris or a fire elsewhere on the building can expose modules directly to flames.
Consequences depend as much on the application as on the PV system itself.
Hi-MO X10 Guardian Fire-Resistant achieved a Class A fire rating according to UL 790, following fire testing under IEC 61730-2:2023 MST 23. IEC 61730 defines the safety testing requirements for PV modules, while UL 790 provides the Class A fire-performance classification for external fire exposure.
View certificatesHi-MO X10 Guardian Fire-Resistant addresses fire risk from both directions: technologies designed to reduce potential ignition within the PV module and a fire-resistant structure designed to limit propagation when fire comes from outside.
Hi-MO X10 Guardian Fire-Resistant combines HPBC 2.0 hot-spot control with reinforced electrical connections and an enhanced junction-box design. These measures help reduce conditions that can contribute to ignition, including severe localised overheating and connection-related faults.
Reinforced sealing and special welding technology strengthen electrical connections and help reduce the risk of DC arcing caused by connection faults.
High-strength fire-resistant glass forms a key part of the module's fire-protection design, supported by flame-retardant materials within the module structure.
LONGi testing shows the glass withstands repeated high-temperature thermal shock and resists shattering for more than 1.5 hours under high-temperature thermal shock.
The module's external fire performance has also been independently tested. Hi-MO X10 Guardian Fire-Resistant achieved Class A according to UL 790, with testing according to IEC 61730-2:2023 MST 23, including spread-of-flame and burning-brand tests.
Hi-MO X10 Guardian Fire-Resistant combines its enhanced fire-resistant design with the high power, efficiency and long-term performance of the Hi-MO X10 back contact platform.
One Class A fire-rated platform, offered in 54, 60 and 72 cell configurations — choose the format that fits your roof and string design.
For some commercial and industrial buildings, fire risk extends well beyond the PV system itself. High-value assets, combustible materials, critical operations or complex building environments can increase the potential consequences of an incident. Hi-MO X10 Guardian Fire-Resistant adds an additional layer of protection for applications where fire safety is a key consideration in PV system design.
Critical equipment and business continuity make fire prevention a priority.
Large roof areas combined with valuable or combustible inventory can increase potential fire consequences.
Insulation materials, temperature-control equipment and difficult access can create complex fire conditions.
High-value machinery and sensitive production processes require a high level of operational protection.
Sites handling combustible materials can require enhanced fire protection measures.
Additional module-level fire protection can support broader building fire-safety strategies.
Fire safety begins with the right design decisions. The building, its use and its individual risk profile influence the level of protection a rooftop PV system should provide. Selecting modules designed to reduce potential ignition sources and limit fire propagation integrates fire protection into the system from the outset.
Our C&I experts can help you assess the application and select the right LONGi module for your project.
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