And capacity determining apparatus and method of the battery system, the power supply system features a battery system and battery system, based thereon

Capacity determining apparatus for determining the capacity of the storage battery of the battery system to be used with the wind power generation system and a processing unit and an input unit. The input unit of the operational condition is a condition for at least one of a range of charge and discharge the output and the remaining power amount of the required battery be met in order to protect the battery data, the outputs of the storage battery system of the wind power generation system combined output of the synthesized power system is required to satisfy the data output fluctuation inhibiting condition is a condition of change in the combined output with respect to time, and inputs the generated output data when indicating an output sequence of the wind power generation system to. Processing unit is calculated from the capacity of the power generation output data and the storage battery so as to satisfy the operational condition, as an index violations amount indicating the degree to deviate from the output fluctuation inhibiting condition, to determine the capacity of the storage battery.