Elevator system and accumulator unit

The invention provides an elevator system which is provided with a device which can monitor the residual electric capacity of all batteries, correctly distributing the charging/discharging currents according to the quantity of batteries connected in parallel, and always sufficiently utilizes all batteries. The elevator system is provided with a plurality of battery cells which are charged by direct current of a converter, a battery discharging/charging circuit which charges the battery cell when the power is supplied by alternative current and a battery charging/discharging circuit which supplies direct current from the battery cell to an inverter and an elevator control circuit when the alternative current is turned off, and a battery control module which is provided with a device which can detect the quantity of parallel connected battery cells, a device which calculates the average charging current/upper limit discharging current of the battery cell according to the quantity of thedetected battery cell, an