How to estimate the time required to charge a high capacity battery (10-60 kWh)?

Question

Electronics

Only experimentally, according to the dependency graph?

Aside from battery degradation, which depends on several factors (ex: charging current value, battery temperature, depth of discharge, number of charge cycles)
Is there any mathematical template that gives an accuracy of 70-80%?

Answer 1

Charging time = Battery capacity / Charging power
For example: Battery capacity = 24 kW*h, Charging power = 3 kW, Approximate charge time = 24 kW*h / 3 kW = 8 hours. In fact, the charge time will be a little longer, because. after 80% the charging current usually decreases.

Answer 2

at currents less than 1C - as usual, divide the capacity in kWh by the charging power in kW.
according to the graphs from the datasheets, everything can be estimated, conditionally by eye, in practice this is always enough. and to determine mathematically accurately with an error of a conditional 1% - it makes no sense even in theory.