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• Myers Achieves BESS Industry Milestone: EnerShed 2.0 First to Pass UL 9540A 6th Edition Fire Test in North America with CSA Group

Air-cooled system demonstrates superior fire performance in advanced testing, spaced only two inches apart, setting a new benchmark for BESS safety compliance

BETHLEHEM, PA, May 7, 2026 — Myers Emergency & Power Systems, a U.S.-based leader in intelligent power infrastructure solutions, today 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 CSA Group, a leading Nationally Recognized Testing Laboratory with a strong presence in the BESS industry. Myers is the first company to achieve this milestone in North America, working  with CSA Group for compliance testing to the newly published 6th Edition of the UL 9540A standard, marking a significant step forward in the commercialization of EnerShed 2.0 and reinforcing the company’s 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,” said Troy Renken, Chief Product Officer of Myers. “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 2026, 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 CSA Group and independent subject matter experts, including Atar Fire, a leading fire protection engineering firm with nearly two decades of experience.

“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,” says Dana Parmenter, Commercial Vice President, Industrial, CSA Group. “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.”

Rigorous Testing, Proven Results

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. These results validate the system’s compliance with fire safety performance obligations under extreme conditions.

“Large-scale fire testing represents the highest level of system safety validation in the battery energy storage industry,” said Nicholas Bartlett, P.E., Senior Fire Protection Engineer at Atar Fire. “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 their successful completion of testing under the 6th Edition standard.”

Advancing Market Readiness

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.

To learn more about EnerShed 2.0, visit: bess.myerseps.com.

About Myers

Myers Emergency & Power Systems is a US-based leading manufacturer and turnkey provider of intelligent power infrastructure solutions with more than 60 years of trusted backup power and controls experience. Myers’ advanced life safety and critical power systems, energy storage, and energy management software solutions are engineered for superior reliability and power density, proudly Made in America, and backed by a nationwide service network. Having served more than 10,000 customers worldwide, Myers protects critical infrastructure when it matters most and helps companies and communities across the globe achieve greater energy independence.

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Media Contact:

Carrie Martinelli
carrie.martinelli@myerseps.com