| 摘要 |
PROBLEM TO BE SOLVED: To provide an invertor in a commercial power supply system and enable a surplus amount to be electrically charged through the invertor by a method wherein a DC/DC converter for controlling an electrical power generated by a solar cell in response to a state of load of a room air conditioner is installed in pair with the room air conditioner. SOLUTION: Generated electrical power of a solar cell 9 is supplied to a DC/DC converter 12 in response to an operating state of a room air conditioner and then the generated electrical power of the solar cell 9 is supplied in response to a load of the air conditioner. In this case, an output electrical power limiting value is applied to the DC/DC converter 12 and then the air conditioner is supplied with only a certain specified generated electrical power. Then, an amount of lack of electrical power is supplied by a commercial electrical power supply 1 through a rectifier circuit 24 and a surplus amount of electrical power is returned back to the commercial power supply system through an inverter 10. With such an arrangement as above, it is possible to improve substantially a rate of utilization of the solar cell and make a substantial reduction of cost of the system as well as obtaining a small-sized and low capacity of the device and utilization of general-purpose component parts. |
