Safety testing and certification for energy storage systems (ESS)
Large batteries present unique safety considerations because they contain high levels of energy. Additionally, they may utilize hazardous materials and moving parts.
We work hand in hand with system integrators and OEMs to better understand and address these issues.
Understanding UL 9540 and ESS certification
UL 9540, the Standard for Energy Storage Systems and Equipment, covers electrical, electrochemical, mechanical and other types of energy storage technologies for systems intended to supply electrical energy. The Standard covers a comprehensive review of ESS, including charging and discharging, protection, control, communication between devices, fluids movement and other aspects.
UL 9540 provides a basis for safety of energy storage systems that includes reference to critical technology safety standards and codes, such as:
- IEEE 1547 and 1547.1
- CSA FC1
- NFPA 70
- NFPA 2
- ASME Boiler and Pressure Vessel Code
- ASME B31 piping codes
The standard includes additional criteria to address materials, enclosures, including walk-in enclosures, controls, piping, utility grid interaction, and special purpose interactive systems, hazardous moving parts, signage and instructions.
If successful, ESS certification can be achieved by evaluation of off-the-shelf components that are put together by the manufacturer or integrator and submitted for certification.
ESS performance and reliability testing
We also offer performance and reliability testing, including capacity claims, charge and discharge cycling, overcharge abilities, environmental and altitude simulation, and combined temperature cycling and vibration testing.
We offer performance testing to standards such as:
- IEC 61960
- IEC 60068 series
- IEC 62933-1-1
- IEC 62933-5-2
- NEMA 80057-2024 (formerly NEMA ESS 1)
Our key services for battery energy storage system (BESS) applications
Testing for safety compliance requirements
We help you meet legislation and market access requirements set by countries across North America, South America, Europe and Asia.
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Testing for global safety and performance requirements
We are deeply knowledgeable about SAE, IEC, UN and UL Standards.
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Performance and reliability testing
We help demonstrate how your products will perform under anticipated usage and various hazardous scenarios — including abuse — during discharge and recharge cycles. We offer custom research and testing services, witness testing and field evaluations.
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Regulatory and code compliance support services
Our seasoned experts can answer questions about the code requirements that may affect your products. We also offer code review services that utilize our expertise in codes to provide technical opinions on requirements that impact product design and installation.
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Our BESS services by application
- Commercial and industrial battery energy storage systems
- Residential battery energy storage systems
- Utility-scale energy storage systems
- Uninterruptible power supply (UPS)
- Electric vehicle charging equipment
Our BESS services by safety standard
UL 9540, The Standard for Energy Storage Systems and Equipment
Covers electrical, electrochemical, mechanical and other types of energy storage technologies for systems intended to supply electrical energy.
UL 9540A, The Test Method for Evaluating Thermal Runaway Fire Propagation in Battery Energy Storage Systems
Explicitly cited in NFPA 855 for large-scale fire testing and is the only national standard in the U.S. and Canada for fire safety testing methods for battery ESS.
UL 1973, The Standard for Batteries for Use in Stationary and Motive Auxiliary Power Applications.
UL 9540B, The Outline of Investigation for Large-Scale Fire Test for Residential Battery Energy Storage Systems
Addresses additional risks and considerations around safety for residential use.
UL 3202, The Standard for Safety for Mobile Electric Vehicle Charging Systems Integrated with Energy Storage Systems
UN/DOT 38.3
United Nations (UN) Manual of Tests and Criteria, Lithium Metal, Lithium-Ion and Sodium-Ion Batteries.
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