IEC 62933-2 defines standardized performance testing methods for Electrical Energy Storage Systems (ESS). It establishes measurable benchmarks for efficiency, capacity, response time, and operational behavior under controlled conditions. This paper describes the energy storage system data acquisition and control (ESS DAC) system used for testing energy storage systems at the Battery Energy Storage Technology Test and Commercialization Center (BEST T&CC) in Rochester, NY. Unlike marketing specifications, IEC 62933-2 focuses on measurable, repeatable, and technology-neutral performance. It constructs a new energy storage power station statistical index system centered on five primary indexes: energy efficiency index, reliability index, regulation index, economic index, and environmental protection index; proposes Analytic Hierarchy Process (AHP)–coefficient of variation. IEC 62933-2-2 specifies application-specific performance testing methods for electrical energy storage (EES) systems, published by the International Electrotechnical Commission (IEC). The system is a configurable platform with over 200 channels of simultaneously measured AC and DC voltages and currents, environmental temperatures.