| 摘要 |
PROBLEM TO BE SOLVED: To effectively utilize a generated power at a low output. SOLUTION: When the generated power of a solar battery is discriminated by a discrimination circuit 504 that it exceeds a predetermined value, charging by a charging circuit 501 is invalidated; and the generated power of the solar battery 1 is outputted to an interconnection inverter 4 via a step-up chopper 3, and the power stored in a storage battery 502 is outputted to the interconnection inverter 4 via a step-up/step-down chopper 503; and the output power of the step-up chopper 3 or the step-up/step-down chopper 503 is fed to a power supply system 6 or a load 7, upon converting to AC power by the interconnection inverter 4. When the generating power of the solar battery 1 is discriminated that it is the predetermined value or lower, operation of the step-up chopper 3 is stopped, and the generating power of the solar battery 1 is stored in the storage battery 502. |
