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This ESS system can be used at peak time of electricity demand by recharging the power at lower priced time zone. This can save secondary power and discharge at the peak time of power consumption to encourage the load leveling. This can also reduce the CO2 emission, one of causing factor of global warming; at the same time, this also efficiently use accumulated power when the demand for electricity is more than its output capacity of commercial electricity from load. It supplies the secondary power supplied from solar power to commercial power supply during peak time of power usage, promoting the electricity leveling and economic benefits.