IEC 62933-2-2 specifies application-specific performance testing methods for electrical energy storage (EES) systems, published by the International Electrotechnical Commission (IEC). Where IEC 62933-2-1 defines general unit-level parameters and tests, IEC TS 62933-2-2 extends this with test procedures tailored to specific grid service applications — enabling performance to be characterised and validated in the context of the duty cycles that BESS systems actually experience in service.
Published by: International Electrotechnical Commission (IEC)
Current edition: IEC TS 62933-2-2:2022
Companion standards: IEC 62933-1 (terminology), IEC 62933-2-1 (unit parameters), IEC 62933-5-1 (grid safety)
Scope
IEC TS 62933-2-2 applies to EES systems intended for grid-connected applications. It defines duty cycles and test procedures for evaluating EES performance in specific grid service roles including energy time-shifting (arbitrage), peak shaving, frequency regulation (primary frequency response), voltage support, and black start capability. The standard allows manufacturers, system designers, owners, and utilities to assess whether an EES system is fit for purpose in a specific grid service application.
Key Contributions
The standard defines representative duty cycles for each grid service application, specifying the power profile, duration, frequency, and rest periods that characterise the application. Performance assessment against these duty cycles provides degradation data more representative of actual service conditions than standard constant-current cycle life tests, enabling more accurate lifetime prediction for BESS systems in specific grid roles. The standard also addresses how to report and compare results across different EES technologies on a consistent basis.
Relevance to Battery Engineering
For BESS engineers and system integrators, IEC TS 62933-2-2 provides the testing framework for demonstrating application fitness to grid operators and offtakers who specify performance requirements in terms of grid services rather than simple capacity and power metrics. Understanding the application duty cycles defined in the standard helps engineers design battery systems with appropriate SoC management strategies, thermal management sizing, and cycle life margins for the intended service profile. As grid service markets mature and performance-based contracts become more common, IEC 62933-2-2 test data is increasingly expected as part of BESS project procurement documentation.
Disclaimer: This is not a definitive guide, just an indication and it is important that you always go back to the source for legislation.