Abstract: An energy storage system controller compatible with energy storage batteries or host systems for a plurality of types of specifications and usages is provided. An embodiment of the present invention is connected to energy storage battery modules including a plurality of energy storage battery cells and status monitor potions acquiring battery information related to status of the battery cells, the controller including a control portion receiving the battery information from the storage monitor portion and outputting control signals for performing control of the battery cells based on battery information, in which the control portion includes a plurality of types of communication interfaces for transferring and receiving data to and from the status monitor portions, the control portion carrying out transmission and reception of the battery information and the control signals with a plurality of types of the status monitors or the battery cells corresponding to different communication interfaces.