Patent ID: 8749203

Claim:
A residential electric power storage system comprising: an electric power storage device configured to be capable of supplying a residence with electric power; an electric power restriction unit following a limit value to restrict an amount of electric power discharged from said electric power storage device to the residence; and a controller that determines said limit value and also controls said electric power restriction unit, said controller including a data accumulation unit that obtains data of an amount of electric power consumed in the residence and accumulates said data obtained, a representative pattern creation unit that creates a representative pattern based on said data accumulated in said data accumulation unit, said representative pattern representatively indicating said amount of electric power consumed in the residence for a discharging period of said electric power storage device, and a limit value determination unit that determines said limit value so that an accumulated value for said discharging period of a smaller one of electric power determined by said pattern and electric power determined by said limit value has a value equal to a capacity that said electric power storage device can electrically discharge.