Myers Emergency & Power Systems, a U.S.-based leader in intelligent power infrastructure solutions, has announced that its EnerShed 2.0 Battery Energy Storage System (BESS) has successfully passed the UL 9540A Large-Scale Fire Test 6th Edition conducted by the CSA Group, becoming the first company to achieve this milestone in North America, reinforcing its market leadership in safety and regulatory compliance.
“At Myers, safety is not a checkbox. It is a core engineering principle that shapes every product decision we make,” commented Chief Product Officer Troy Renken. “Successfully completing the UL 9540A 6th Edition Large-Scale Fire Test reflects our commitment to designing systems that customers and communities can trust, while also staying ahead of evolving codes and standards. Being the first in our industry to achieve this milestone cements Myers’ position as an emerging market leader in the BESS category.”
Published in March, the UL 9540A 6th Edition introduces the most substantial updates to the standard in years, including formal integration of LSFT testing into the certification framework. Manufacturers must now demonstrate that a thermal runaway event in one unit will not propagate to adjacent units under defined conditions. To support transparency and validation, Myers completed this testing at Safe Laboratories under the observation of the CSA Group and independent subject matter experts, including Atar Fire, a leading fire protection engineering firm with nearly two decades of experience.
Dana Parmenter, CSA Group Commercial VP, Industrial, added: “As BESS safety standards continue to evolve, large-scale fire testing under UL 9540A, 6th Edition is critical to demonstrating system compliance under real-world fire conditions. To support these requirements, CSA Group has invested in specialized capabilities and technical expertise to deliver rigorous, high-precision large-scale fire testing. Working with Myers, CSA Group supported and observed this testing, helping generate system-level fire performance data for the EnerShed 2.0 system to support safety validation and the evaluation of fire propagation risk.”
EnerShed 2.0 underwent testing in extremely demanding, real-world conditions with unit spacing at a mere two inches apart. Its innovative air-cooled architecture, passive barriers and open module design required a more robust test scenario than conventional liquid-cooled systems—and it passed. Results showed no fire propagation in adjacent enclosures, the most stringent outcome defined by the standard, validating the system’s compliance with fire safety performance obligations under extreme conditions.
Nicholas Bartlett, P.E., Senior Fire Protection Engineer at Atar Fire, went on: “Large-scale fire testing represents the highest level of system safety validation in the battery energy storage industry. EnerShed 2.0’s unique design required a demanding test protocol intended to simulate worst-case scenarios. Myers’ decision to conduct open-door testing under these extreme conditions reflects a strong commitment to both transparency and safety at the highest levels, and we recognize its successful completion of testing under the 6th Edition standard.”
Passing the UL 9540A 6th Edition LSFT represents a key milestone in EnerShed 2.0’s path to market. As authorities having jurisdiction (AHJs), insurers and developers increasingly rely on large-scale fire test data for permitting and deployment, this achievement supports project readiness and streamlines approval processes, giving Myers’ customers, partners and project stakeholders the confidence they need to move forward.
Myers’ leadership in achieving this first-of-its-kind certification underscores the company’s commitment to engineering excellence, regulatory compliance and the responsible commercialization of next-generation BESS technology.