Patent ID: 9553480
Date: 2017-01-24
CPC Classifications: H02J,Y02B,Y02E,Y04S

Claim:
1. An electric power system connected with commercial electric power, comprising; a first unit equipped with a first power source, a first rechargeable battery to which an output of the first power source and power form the commercial electric power are input, a controller, and a first power consuming portion to which an output of the first rechargeable battery is input; a second unit equipped with a second power source, a second rechargeable battery to which an output of the second power source and power form the commercial electric power are input, and a second power consuming portion to which an output of the second rechargeable battery is input; and a first electric power line for sharing electric power directly between the first rechargeable battery and the second rechargeable battery, wherein the electric power is directly transmitted from the first rechargeable battery to the second battery and vice versa through the first electric power line which is controlled by the controller, wherein the controller is arranged to control electric power transmission directly from the first rechargeable battery to the second rechargeable battery and vice versa through the first electric power line depending on whether or not a present time is in a midnight power rate time slot of the commercial electric power.