Power storage control apparatus, power storage apparatus, remaining charge time computing method, and non-transitory computer-readable storage medium storing remaining charge time computing program

A remaining charge time computing method for computing a remaining charge time of a power storage apparatus that includes a plurality of battery banks and employs a bank switch method as a charge method, the method comprising:

• controlling charging and discharging of the power storage apparatus by a processor communicatively connected to a charge/discharge circuitry of the power storage apparatus;
• computing, by the processor, the remaining charge time of the power storage apparatus based on linear approximation of correlation between an operating environment of the power storage apparatus and a charge time of the power storage apparatus, the charge time including a charge stop time;
• reading correlation data stored in advance in a storage, computing the remaining charge time using the read correlation data, and updating the correlation data in the storage based on an actual measurement value of the charge time, the correlation data including a reference value of a full charge time of the power storage apparatus and a reference value of an input voltage to the power storage apparatus from an external power source, the reference values both set for each of a plurality of reference values of a battery temperature of the power storage apparatus;
• acquiring a conversion value of the full charge time by converting the actual measurement value of the charge time;
• updating the reference value of the full charge time in the storage corresponding to a battery temperature at a start of charge based on the acquired conversion value of the full charge time;
• and
• updating the reference value of the input voltage in the storage corresponding to the battery temperature at the start of charge based on the input voltage at the start of charge.