Energy Storage System

We resume here the main questions we have been asked about Energy Storage Systems,

When we talk about Energy Storage Systems (ESS), What are the main requirements for the north American market?

  • Standard UL 9540:2020: Energy Storage Systems and Equipment
  • Standard UL 9540A:2019: Test Method for Evaluating Thermal Runaway Fire Propagation in Battery Energy Storage Systems
  • Standard NEMA 250:2014: Enclosures for Electrical Equipment (1000 Volts Maximum)

What about other international markets?

  • Standard IEC 62933-2-1:2017: Electrical energy storage (EES) systems – Part 2-1: Unit parameters and testing methods – General specification
  • Standard IEC 62933-5-1:2017: Electrical energy storage (EES) systems – Part 5-1: Safety considerations for grid-integrated EES systems – General specification
  • Standard IEC 62933-5-2:2020: Electrical energy storage (EES) systems – Part 5-2: Safety requirements for grid-integrated EES systems – Electrochemical-based systems

For an Energy Storage System (ESS) certification process, the most requested services for mechanical and electrical, operation, safety and EMC analysis are:

  • Bonding Conductor Test (Earth current test)
  • Spacings and Insulation resistance test
  • Mechanical Assembly
  • Temperature (Heating) Test
  • Dielectric voltage withstand and Impulse test
  • EMC tests (Immunity and emissions)
  • Other test required in the certificates

What shall be considered on the development of an Energy Storage System (ESS) to ensure the fulfilment of the certification process?

Once the product is finished, the ESS will need a certificated based on the following test
  • Temperature test (normal operation)
  • Salt mist test
  • Vibration test
  • Thermal runaway
  • Communication loss tests
  • Short-circuit protection
  • Overcharge
  • Enclosure impact (including IK)
  • IP and NEMA tests
  • Corrosion tests
  • Nominal Energy capacity and Efficiency
  • Sound level (Noise)
  • Lifting test
  • Others
The development stage of the product must ensure the ESS has the capability to pass all the test needed for certification.

About us

CERE is an independent testing, simulation, certification and inspection body that was originally set up as a Certification Entity for Renewable Energies in 2015. Our services include technical assessment, inspection, testing, simulation and certification according safety, EMC, grid quality, grid connection requirements, design certification and complete installations certificates.