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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.
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.
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:
We help you meet legislation and market access requirements set by countries across North America, South America, Europe and Asia.
We are deeply knowledgeable about SAE, IEC, UN and UL Standards.
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.
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.
Covers electrical, electrochemical, mechanical and other types of energy storage technologies for systems intended to supply electrical energy.
Addresses additional risks and considerations around safety for residential use.
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.
United Nations (UN) Manual of Tests and Criteria, Lithium Metal, Lithium-Ion and Sodium-Ion Batteries.
On-demand webinar
Explore the latest UL 9540A:2025 updates on thermal runaway testing for battery energy storage systems (BESS) with expert insights from UL Solutions.
ESS manufacturers can benefit from testing and certification services for ESS standards and codes.
Unit assemblers and system integrators can benefit from our comprehensive field evaluations that can help you demonstrate the compliance of an ESS installation to code authorities, owners and regulatory bodies.
Installers can benefit from our field services that bring compliance expertise to you to help address the safety and performance of equipment and systems as during or upon installation.
Module and pack manufacturers can benefit from electrical, mechanical and environmental testing to evaluate the ability of large batteries to safely withstand simulated abuse conditions based on your specified charge and discharge parameters.
Cell manufacturers can benefit from battery cell certification services that test to all applicable industry standards to help demonstrate the performance, reliability and safety of battery cells used in an increasing number of products.
Depending on the applicability of the system, different standards need to be met before you can get your products into different installations and markets. For example, depending on the area of Europe the product will be installed, you may need:
For any of the marking processes listed above, your system must meet the following requirements:
Safety requirements for Marking and self-declaration
EMC requirements for Marking and self-declaration
UL Solutions leverages extensive experience in battery evaluation to offer testing, simulation and failure analysis, with a strong focus on battery life expectancy. Our team of experts, including leading battery researchers, plays a critical role in advancing battery performance and safety.
We conduct custom research to help identify and address the unique performance and safety issues associated with large energy storage systems.
When you partner with us, you will benefit from the demonstrated mastery in advancing battery technology and safety we have amassed in more than 35 years of battery testing. Our team of scientists, engineers and product specialists are committed to advancing battery technology and are actively involved in shaping industry standards, developing Outlines of Investigation and refining testing protocols.
Our experienced engineering and research teams can help you develop insights using our deep knowledge of battery chemistries and fire suppression formed by establishing and cultivating enduring partnerships with regulators and industry stakeholders. We are proud of our demonstrable track record of success serving organizations and entities such as fire departments and electrical and building inspectors.
Among our global network of facilities, six of our 80 laboratories specialize in battery cell, pack and module testing and feature flexible availability, with no need for subcontracting. Our staff of expert field engineers is ready to deliver on-site or witness testing services to support your market access across North America, South America, Europe and Asia.
We work with system integrators and OEMs to better understand and address energy storage systems issues.
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.
Industrial functional safety services encompass a range of activities that support safer and more reliable industrial systems, machinery and processes.
Committing to safety, performance and quality of distributed energy resource (DER) systems and products.
Our services include regulatory mapping and assessment for global market industrial products and systems.
Accelerate your UL 9540A large-scale fire testing for battery energy storage systems with UL Solutions.
Navigate the complex requirements of the EU Battery Regulation across various battery categories with guidance and expertise from UL Solutions.
