| 摘要 |
A charging operation controlling portion controls charging current or charging voltage when the battery pack 440 is charged with electric power generated by the solar panel 410. The current detecting portion 456 detects charging current of the battery pack. The voltage detecting portion 455 detects battery voltage of the battery pack. The charging operation controlling portion, when the battery pack 440 is brought close to the fully-charged state, cuts off the charging current at predetermined timing for a charging operation stop period, and compares the battery voltage of the battery pack 440 with a predetermined voltage value as a restart voltage value in the charging operation stop period. The charging operation controlling portion determines that the battery pack 440 is fully charged if the battery voltage of the battery pack 440 is not less than the predetermined voltage value as the restart voltage value, and cuts off the charging current. |
