A New Chapter in Fire Protection: Sungrow SBH Series Passes the World's First UL Solutions' Residential Fire Test

Against these stringent requirements, Sungrow's SBH Residential ESS successfully withstood a demanding 24-hour trial. Confronted with multiple challenges—including closely spaced battery units, deactivated active fire suppression, continuous ignition triggers, and no external intervention—the system demonstrated exceptional inherent safety controls, passing all evaluation criteria. Against these stringent requirements, Sungrow's SBH Residential ESS successfully withstood a demanding 24-hour trial...

HEFEI, China, 27/11/2025 (informazione.news - comunicati stampa - energia)

Against these stringent requirements, Sungrow's SBH Residential ESS successfully withstood a demanding 24-hour trial. Confronted with multiple challenges—including closely spaced battery units, deactivated active fire suppression, continuous ignition triggers, and no external intervention—the system demonstrated exceptional inherent safety controls, passing all evaluation criteria.

The SBH Residential ESS demonstrated unparalleled fire containment during the UL 9540B fire safety test, thanks to a range of advanced safety features, including cell-level fire-resistant insulation, bottom heat dissipation, and multi-directional pressure relief. During the test, when one unit ignited due to thermal runaway, the flames were confined to the pressure relief area. Adjacent units recorded internal surface temperatures of just 21°C—well below the 154°C venting threshold—while eave temperatures peaked at 35°C, far under the 150°C limit.

By leveraging structural designs that facilitate rapid heat dissipation and thermal isolation between modules, the SBH Residential ESS successfully confined thermal runaway to the bottom module. Without any fire suppression intervention, the open flames self-extinguished within one hour. Further ignition attempts over the next 24 hours resulted in no re-ignition, demonstrating the system's exceptional safety performance.

With the active fire suppression system disabled throughout testing, the SBH Residential ESS experienced no combustion events, explosions, or projectile hazards. The cabinet remained fully intact, showcasing outstanding fire resistance, explosion prevention, and structural stability.

Building on its previous success in the UL 9540A Thermal Runaway Fire Propagation Test, the SBH Residential ESS has now passed the rigorous UL 9540B large-scale fire test. This accomplishment further validates the system's comprehensive safety capabilities, covering everything from cell-level thermal runaway suppression to full system-wide fire control. As a result, homeowners can have confidence in the SBH Residential ESS's superior safety performance in real-world fire scenarios.

As a global leader in energy storage, Sungrow is committed to upholding the highest safety standards in the industry. With a focus on continuous innovation, Sungrow will continue to advance safety-driven technologies to ensure homeowners can rely on worry-free energy use, backed by uncompromising protection.

About Sungrow

Sungrow, a global leader in renewable energy technology, has pioneered sustainable power solutions for over 28 years. As of June 2025, Sungrow has installed 870 GW of power electronic converters worldwide. The Company is recognized as the world's most bankable PV inverter and energy storage company (BloombergNEF). Its innovations power clean energy projects across the globe, supported by a network of 520 service outlets guaranteeing excellent customer experience. At Sungrow, we're committed to bridging to a sustainable future through cutting-edge technology and unparalleled service. For more information, please visit: www.sungrowpower.com.

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