Abstract: A power storage system controls a charging mode in which an assembled battery including a plurality of battery modules is charged. The assembled battery is charged through a constant current control based on a predetermined current value in the beginning of the charging mode and is charged through a constant voltage in the end of the charging mode. A determination part determines whether an apparatus electrically connected to an electric power line which the power storage system is electrically connected is in active. A controlling part constantly controls the current value for charging the assembled battery in the charging mode. In a case where the determination part determines that the apparatus is not in active, the controlling part sets the constant current value to a first current value at the beginning of a time period in which the charging mode is performed.

Abstract: A power storage system is provided. A control apparatus controls the power storage system to perform a charging mode in which an assembled battery is charged in a first predetermined time period and a discharging mode in which the assembled battery is discharged in a second predetermined time period. A residual electric power amount determination unit detects an amount of one of electric current and electric power currently remaining in the assembled battery. A discharged electric power amount determination unit detects an amount of one of electric current and electric power discharged from the assembled battery during the second predetermined time period.