Battery charging system

A battery charging system, comprising:

• a heavy electric line adapted to make electrical connection with an external power source;
• an in-vehicle battery connected electrically with the heavy electric line and arranged to be charged with power supplied through the heavy electric line;
• a load connected electrically with the heavy electric line and arranged to receive power supplied through the heavy electric line;
• a setting section configured to set a charging power allowable by the battery, as an allowable battery power;
• a battery power requesting section configured to request supply of charging power to the battery;
• a load power requesting section configured to request supply of power to the load;
• and
• a controlling section configured to control supply power to be supplied from the external power source to the battery and the load, in accordance with a request charging power from the battery power requesting section and a request load power from the load power requesting section,
• the controlling section being configured:
• to calculate, as a minimum driving power, a minimum value of the supply power to the load in a driving operation of driving the load in accordance with the request load power of the load power requesting section in response to a request of the load power requesting section for the supply of power to the load,
• to calculate, as a target load driving power, a power which is within a range of surplus power determined by a difference between an available supply power that the external power source can supply and a power supplied to the in-vehicle battery, and which is lower than or equal to the minimum driving power,
• to set, as a limit power, a sum of the target load driving power and the allowable battery power, and
• to distribute the supply power from the external power source between the battery and the load within a range of limitation of limiting the supply power from the external power source to the battery to the limit power.