PD IEC TS 62933-2-3-2025 PDF

Full title and description

Electric Energy Storage (EES) Systems - Part 2-3: Unit parameters and testing methods - Performance assessment test during site operation. This Technical Specification defines the unit-level parameters, measurement procedures and on-site test methods used to validate and assess the operational performance of grid‑connected EES units after commissioning.

Abstract

IEC TS 62933-2-3:2025 specifies unit parameters and testing methods for performance assessment of electrical energy storage (EES) systems during site operation. It provides procedures for collecting and interpreting measurement data, acceptance/verification criteria for key performance indicators, and guidance for executing performance tests without removing the EES unit from service where applicable.

General information

• Status: Current (Technical Specification).
• Publication date: 15 May 2025.
• Publisher: International Electrotechnical Commission (IEC), TC 120 (Electrical Energy Storage systems).
• ICS / categories: 13.020.30 (Environmental impact assessment / Electrical energy storage related categories).
• Edition / version: Edition 1.0 (Technical Specification, 2025).
• Number of pages: 39 pages.

Scope

This Technical Specification covers the definition of unit parameters (electrical, thermal and operational), the equipment and measurement methods required for in‑service performance assessment tests, procedures to conduct performance tests at site (during normal operation or dedicated test intervals), and the format for reporting results and deviations. It is intended to be used after commissioning to verify that installed EES units meet declared performance and to support commissioning acceptance, warranties and asset performance verification. Normative references include other parts of IEC 62933 and power quality measurement methods such as IEC 61000‑4‑30 where relevant to measurement accuracy and instrumentation.

Key topics and requirements

• Definition of unit performance parameters: capacity, round‑trip efficiency, power capability, response time, ramp rates and availability.
• On‑site measurement and instrumentation requirements, including sampling rates, calibration and uncertainty management.
• Test procedures for performance assessment during normal operation and during planned test intervals (charge/discharge cycles, reference profiles).
• Performance acceptance criteria and pass/fail evaluation for declared ratings and warranty verification.
• Data recording, reporting templates and recommended content for test reports (time series, summary KPIs, environmental and operational context).
• Considerations for interaction with site controllers, grid constraints and safety precautions during testing.
• References to related IEC procedures and power quality measurement standards for ensuring measurement accuracy (e.g., IEC 61000‑4‑30).

Typical use and users

This TS is used by EES manufacturers, storage system integrators, commissioning and testing laboratories, utilities and grid operators, independent validators/consultants, asset owners and warranty claim assessors. Typical applications include post‑commissioning acceptance testing, warranty performance verification, troubleshooting of under‑performance, and periodic reassessments of unit capability during operation.

Related standards

IEC TS 62933‑2‑3 is part of the IEC 62933 family on Electrical Energy Storage (EES) systems. Related normative and informative documents include IEC 62933‑2‑1 (Unit parameters and testing methods – general specification), IEC TS 62933‑3‑2 (planning and performance assessment for power‑intensive and renewable integration applications), IEC 62933‑5‑2 (safety requirements for grid‑integrated electrochemical systems) and measurement standards such as IEC 61000‑4‑30 (power quality measurement methods).

Keywords

electrical energy storage, EES, performance assessment, on‑site testing, unit parameters, commissioning, acceptance testing, IEC 62933, power quality, measurement methods.

FAQ

Q: What is this standard?

A: IEC TS 62933‑2‑3:2025 is a Technical Specification that defines unit parameters and on‑site testing methods for performance assessment of electrical energy storage systems during site operation, published by the IEC (TC 120).

Q: What does it cover?

A: It covers measurement definitions, test procedures and reporting for validating declared unit performance (capacity, efficiency, power capability, response characteristics) after commissioning, including guidance for measurement accuracy and interaction with site controllers.

Q: Who typically uses it?

A: Manufacturers, integrators, commissioning teams, test laboratories, utilities, asset owners and warranty/acceptance engineers use this TS to verify and document EES unit performance in the field.

Q: Is it current or superseded?

A: This Technical Specification was published on 15 May 2025 and is current (first edition); stability information published by IEC indicates its planned stability period (typical for TS documents) into the next few years from publication.

Q: Is it part of a series?

A: Yes — it is part of the IEC 62933 series addressing electrical energy storage systems (multiple parts cover general unit parameters, planning, safety, testing and application‑specific requirements) developed under IEC TC 120.

Q: What are the key keywords?

A: Key keywords include: electrical energy storage (EES), performance assessment, unit parameters, on‑site testing, commissioning, IEC 62933, power quality, measurement methods, acceptance testing.