Energy Storage System Testing and Certification

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, is the standard for safety of energy storage systems, which includes electrical, electrochemical, mechanical and other types of energy storage technologies for systems intended to supply electrical energy. The Standard covers a comprehensive review of energy storage systems, covering 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 UL 1973, the Standard for Batteries for Use in Stationary, Vehicle Auxiliary Power and Light Electric Rail (LER) Applications; UL 1741, the Standard for Inverters, Converters, Controllers and Interconnection System Equipment for Use With Distributed Energy Resources; IEEE 1547 and 1547.1; CSA FC1; NFPA 70; NFPA 2; ASME Boiler and Pressure Vessel Code; and ASME B31 piping codes. It includes additional criteria to address materials, enclosures, including walk-in enclosures, controls, piping, utility grid interaction, including special purpose interactive systems, hazardous moving parts, signage and instructions.

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 provide performance certification marks for:

• IEC 60086-1 and IEC 60086-2: Primary Batteries – Part 1: General; and Primary Batteries – Part 2: Physical and Electrical Specifications
• IEC 61960: Secondary Cells and Batteries Containing Alkaline or Other Non-acid Electrolytes – Secondary Lithium Cells and Batteries for Portable Applications
• IEC 61951-1: Secondary Cells and Batteries Containing Alkaline or Other Non-acid Electrolytes – Portable Sealed Rechargeable Single Cells – Part 1: Nickel-cadmium
• IEC 61951-2: Secondary Cells and Batteries Containing Alkaline or Other Non-acid Electrolytes – Portable Sealed Rechargeable Single Cells – Part 2: Nickel-metal Hydride
• IEC 62933-5-2: Electrical energy storage (EES) systems - Part 5-2: Safety requirements for grid-integrated EES systems - Electrochemical-based systems

Marking for Energy Storage Systems

Depending on the applicability of the system, there will be different standards to fulfill for getting the products into the different installations and Markets.

Depending on the area of Europe to install the product:

• CE Marking and CE self-declaration for all Europe except the United Kingdom 
• UKCA Marking and UKCA self-declaration for Great Britain since January 1, 2021 
• UKNI Marking and UKNI self-declaration for Northern Ireland since January 1, 2021

For any of the marking processes listed above, the system shall fulfil the following requirements:

Safety requirements for Marking and self-declaration

•  Low Voltage 2014/35/UE 
•  UK Legislation; Electrical Equipment (Safety) Regulations 2016.

EMC requirements for Marking and self-declaration

•  Electromagnetic Compatibility 2014/30/UE 
•  UK Legislation; Electromagnetic Compatibility Regulations 2016

Custom research of energy storage systems

We conduct custom research to help identify and address the unique performance and safety issues associated with large energy storage systems. Research offerings include: