Abstract: In an embodiment, in an operation method of a power storage system, a plurality of SOC ranges shifted from each other are set, and one of the SOC ranges to be an option is selected as an operation SOC range for each of a plurality of groups so as to be in a state where the SOC ranges selected are different between the groups. In the operation method, a power storage facility belonging to each of the groups is operated in the SOC range selected as the operation SOC range, and the SOC range to be selected as the operation SOC range is sequentially switched between the plurality of SOC ranges for each of the groups so as to be in a state in where the SOC ranges selected are different between the groups.

Abstract: In an operating method of a battery in an embodiment, one of a plurality of SOC ranges shifted from each other is selected as an operation SOC range, and the battery is operated in the SOC range selected as the operation SOC range. In the operation method, the SOC range selected as the operation SOC range is sequentially switched between the plurality of SOC ranges.