Storage battery evaluating device, power storage system and storage battery evaluating method

A storage-battery evaluation device comprising: an information acquirer to receive a plurality of charge/discharge command values instructing charge/discharge of electric power for an energy storage device, and receive voltage values measured at the energy storage device subjected to charge/discharge by execution of the plurality of charge/discharge command values; a data generator to generate corresponding data including voltage values and charge amounts of the energy storage device based on the received voltage; and a deterioration evaluator to specify first charge/discharge command values of the plurality of charge/discharge command values wherein execution of the first charge/discharge command values results in the charge amount of the energy storage device falling within a first charge-amount range, and the first charge-amount range corresponds to part of a charge-amount range of the energy storage device, determine whether to perform evaluation of a deterioration state of the energy storage device based on a first distribution of a relation between charge/discharge command values and frequencies of the charge/discharge command values based on the first charge/discharge command values, specify voltage values corresponding to charge amounts belonging to the first charge-amount range, based on the corresponding data when the deterioration evaluator determines to perform the evaluation of the deterioration state of the energy storage device, and specify a deterioration state of the energy storage device based on a second distribution of a relation between voltage values and frequencies based on the specified voltage values. --- BOARD -- --- --- --- --- [B I IU -- --- --- _________________ ________________ _______________ t L I I'