Control device for charging system

A control device for a charging system including:

• a solar panel configured to generate electric power by being irradiated with sunlight;
• a low-voltage battery chargeable by receiving the electric power from the solar panel;
• a voltage converter configured to step up electric power from the solar panel and the low-voltage battery and output the electric power;
• and
• a high-voltage battery chargeable by receiving the electric power from the voltage converter, wherein
• the control device is configured to:
• acquire a supplied power value from the solar panel;
• determine whether the acquired supplied power value is equal to or larger than a specified power value;
• perform a first supply process for controlling the voltage converter to supply the electric power from the solar panel to the high-voltage battery via the voltage converter while setting input-output power of the low-voltage battery to zero under a condition that the supplied power value is determined to be equal to or larger than the specified power value;
• perform a second supply process for controlling the voltage converter to supply the electric power from the solar panel and the low-voltage battery to the high-voltage battery via the voltage converter under a condition that the supplied power value is determined to be smaller than the specified power value;
• and
• set the specified power value based on one or more of a first index value indicating a degree of deterioration of the low-voltage battery and a second index value indicating a degree of whether the low-voltage battery is in a state in which the low-voltage battery is likely to deteriorate.