Patent ID: 8860252

Claim:
A power storage system for supplying power to a load by coupling a power generation system, a battery, and a grid, the power storage system comprising: an integrated controller for monitoring states of the power generation system; a battery management system (BMS) for controlling charging and discharging of the battery according to a control signal from the integrated controller; and a power supply circuit for supplying power to the BMS, and comprising: a converter configured to adjust a power of the battery by reducing a voltage of the power of the battery and to supply the adjusted power of the battery to the BMS; a first diode coupled between an input terminal for receiving an external power and a power supply terminal of the BMS; and a second diode coupled between the converter and the power supply terminal of the BMS, wherein the power supply circuit is configured to supply the external power to the BMS as an operating power of the BMS in a first state in which the external power is applied, and wherein the power supply circuit is configured to supply the adjusted power of the battery to the BMS as the operating power of the BMS in a second state in which the external power is not applied.