UL - 9540 BULLETIN
UL Standard for Safety Energy Storage Systems and Equipment
|Publication Date:||15 October 2021|
These requirements cover an energy storage systems (ESS) that is intended to receive and store energy in some form so that the energy storage system can provide electrical energy to loads or to the local/area electric power system (EPS) when needed. The types of energy storage covered under this standard include electrochemical, chemical, mechanical and thermal. The ESS shall be constructed either as one unitary complete piece of equipment or as matched assemblies, that when connected, in accordance with the manufacturer's installation instructions, form the ESS. An ESS consists of at least an energy storage function and energy storage protective function. If the system includes multiple parts that are housed in separate enclosures, it shall be considered as a multi-part ESS covered by this standard. Individual parts (e.g. power conversion equipment, a battery etc.) of an energy storage system are not considered an ESS on their own. This Standard evaluates the compatibility and safety of these various components and parts integrated into a system. The ESS can be an AC ESS or a DC ESS as defined in this Standard.