NEC Corp. has commercialized a power storage system using a lithium-ion battery to control household power use automatically. The system comprises a lithium-ion battery with an input/output capacity of two kilowatts and a storage capacity of six-kilowatt hours, and a controller. When connected to a household power panel, the system links to the power system of a utility company, electric devices at home, a photovoltaic generation system, and others so that automatic power control may operate interactively. Users can store photovoltaic (PV) generated power or low-cost late-night electricity for use in daytime, which will result in reduced consumption of power from the ordinary power grid at peak times and lowered utility costs.
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