| 摘要 |
A battery capable of being charged by a solar cell and an electric generator has its state of charge detected by a charge-state detecting sensor, and an electric generator operation control device controls the charge of the battery by the electric generator in accordance with the detection result detected by the charge-state detecting sensor so as to make the state of charge detected by the charge-state detecting sensor less than 100%. Accordingly, it is possible to effectively charge the battery by electricity obtained by the solar cell.
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