This part of IEC 62282 defines the evaluation methods of typical performances for electric energy storage systems using hydrogen. This is applicable to the systems that use electrochemical reaction devices for both power charge and discharge. This document applies to systems that are designed and used for service and operation in stationary locations (indoor and outdoor). The conceptual configurations of the electric energy storage systems using hydrogen are shown in Figure 1 and Figure 2. Figure 1 shows the system independently equipped with an electrolyser module and a fuel cell module. Figure 2 shows the system equipped with a reversible cell module. There is an electrolyser module and a fuel cell module, or a reversible cell module, an overall management system (which includes a data interface and may include a pressure management), a thermal management system (which may include a heat/cold storage), a water management system (which may include a water storage) and a purge gas supply (inert gas, practically neither oxidising nor reducing) as indispensable components. NOTE Indispensable components are indicated by bold lines in Figure 1 and Figure 2 The system may be equipped with either a hydrogen storage or a connection to an external hydrogen supply infrastructure or a combination of both. There may be a battery and an oxygen storage, as optional components. The electrolyser module may comprise one or more electrolysers whether or not of same type. Depending on the operating conditions and considering the operation history, the overall management system may command the concurrent operation of the electrolysers. The fuel cell module may comprise one or more fuel cells whether or not of same type. Depending on the operating conditions and considering the operation history, the overall management system may command concurrent operation of the fuel cells. The reversible cell module may comprise one or more reversible cells whether or not of same type. The fuel cell module may comprise one or more fuel cells whether or not of same type. Depending on the operating conditions and considering the operation history, the overall management system may command concurrent operation of the reversible cells. The performance measurement is executed in the defined area surrounded by the bold outside solid line (system boundary). NOTE In the context of this document, the term "reversible" does not refer to the thermodynamic meaning of an ideal process. It is common practice in the fuel cell community to call the operation mode of a cell that alternates between fuel cell mode and electrolysis mode "reversible". This document is intended to be used for data exchanges in commercial transactions between the system manufacturers and customers. Users of this document can selectively execute test items suitable for their purposes from those described in this document.