UL Solutions Introduces New Certification Pathway for DC Energy Storage Systems

UL Solutions, a global leader in safety science, now offers a certification pathway that helps customers demonstrate compliance for DC energy storage systems (DC ESS) paired with approved subsystems, including power conversion systems (PCS). This offering establishes a clear pathway for demonstrating compliance to UL 9540, the Standard for Energy Storage Systems and Equipment for certification of systems that include non-UL certified or UL listed components. This can help customers achieve accelerated approvals and reduce certification complexity.

Manufacturers of DC ESS face unique challenges when seeking installation approval. Traditional certification pathways are optimized for systems produced entirely under a single manufacturing program. However, many DC ESS designs are modular and rely on matched assemblies or parts.

UL Solutions’ DC ESS and Approved Subsystems service addresses this complexity by:

• Evaluating DC ESS for use with approved subsystems to the fully applicable requirements of UL 9540.
• Documenting sub-assembly model compatibility directly in UL Solutions’ Product iQ® database under the DC ESS certification category, enabling clear verification by code authorities.
• Demonstrating electrical, communication and interoperability between the DC ESS and each approved subsystem that has been evaluated.
• Offering manufacturers a streamlined alternative to a full matched assembly system listing.

Benefits for manufacturers, developers and code authorities

• Demonstrated compliance with UL 9540 when a compatible subsystem is identified
• Improved market flexibility for modular and scalable ESS deployments
• Accelerated pathway to full system listing when needed

What UL Solutions offers

UL Solutions provides testing, inspection and certification services for DC Energy Storage Systems. With a global network of laboratories and technical experts, we help manufacturers navigate complex safety requirements, streamline time –to market and build trust with customers and regulators.