Patent ID: 7906934

Claim:
A power source apparatus comprising: a solar cell; a DC-DC converter that controls an output of the solar cell; a battery that is charged with an output of the DC-DC converter; an inverter into which an output of said DC-DC converter and an output of said battery are input in parallel; and converter driving means that drives said DC-DC converter when a remaining amount of said battery is below or equal to a predetermined amount so that the battery can be charged with the output of said DC-DC converter, wherein said converter driving means supplies the output of said DC-DC converter to said inverter when an output electric power of said solar cell exceeds a predetermined value, said converter driving means supplies the output of said DC-DC converter to said battery for charging the battery without supplying the output to said inverter when the output electric power of said solar cell is below or equal to the predetermined value, and said converter driving means starts supplying electric power from the battery to said inverter when said battery is charged to a predetermined amount without supplying the output of said DC-DC converter to said inverter while the output electric power of said solar cell remains below or equal to the predetermined value.