Energy storage system
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorKiyotaka Takehara
Life of this patent
Estimating the term…
Abstract
In an energy storage system, power from at least one of a solar cell, a commercial AC power source, and a storage battery is supplied to load devices. In the daytime, under the condition that an amount of power generated by the solar cell is less than an amount of power consumed by the load device, the discharge from the storage battery to the load device is permitted or prohibited if the charge level of the storage battery is higher or is not higher than the reference charge level. The discharge from the storage battery which makes the charge level of the storage battery lower than the reference level is permitted at night.
Claims19
An energy storage system comprising a storage battery, a solar cell and a commercial AC power source,
- wherein, when a charge level of the storage battery is not greater than a reference charge level, a discharge from the storage battery to a load device is permitted or prohibited depending on a time zone,
- wherein the storage battery is charged with electric power from the solar cell,
- wherein electric power from at least one of the solar cell, the commercial AC power source, and the storage battery is supplied to the load device,
- wherein, in the daytime, when an amount of electric power generated by the solar cell is less than an amount of electric power consumed by the load device and the charge level of the storage battery is higher than the reference charge level, the discharge from the storage battery to the load device is permitted,
- wherein, in the daytime, when the amount of electric power generated by the solar cell is less than the amount of electric power consumed by the load device and the charge level of the storage battery is not higher than the reference charge level, the discharge from the storage battery to the load device is not permitted, and
- wherein the discharge from the storage battery which makes the charge level of the storage battery lower than the reference charge level is permitted at night.
A power control device configured to:
- control a storage battery to be charged with electric power from a solar cell;
- control electric power from at least one of the solar cell, a commercial AC power source and the storage battery to be supplied to a load device, when a charge level of the storage battery is not greater than a reference charge level, permit or prohibit a discharge from the storage battery to the load device depending on a time zone;
- in the daytime, when an amount of electric power generated by a solar cell is less than an amount of electric power consumed by the load device and the charge level of the storage battery is higher than the reference charge level, permit the discharge from the storage battery to the load device;
- in the daytime, when the amount of electric power generated by the solar cell is less than the amount of electric power consumed by the load device and the charge level of the storage battery is not higher than the reference charge level, prohibit the discharge from the storage battery to the load device;
- and
- permit the discharge from the storage battery which makes the charge level of the storage battery lower than the reference charge level at night.
Dependencies are inferred from the claim text.