Mattingly, Stanger & Malur, P.C.
Electric power system using an electric power storing secondary battery effective for load leveling
 An electric power system effective for load leveling includes an electric power meter which measures the power that is charged from a generating facility into an electric power storing secondary battery via ac/dc converters, and also measures the discharged power that is supplied from the electric power storing secondary battery to a load via the ac/dc converters. A processing unit is provided which calculates a difference of an electric power fee from the quantity of charged power and quantity of discharged power measured by the electric power meter and respective unit prices of electric power, and then calculates the price for using the electric power storing secondary battery based on the electric power fee. The processing unit may be installed either on a manufacturer/lender's side or on an electric power consumer's side. 
Hitachi, Ltd.
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Y02E G01R H01M H02J
additional additional inventional inventional
Tadahiko Manabu
Miyoshi Madokoro