Battery capacity and current unit
240KW/400KW industrial rooftop - commercial rooftop - home rooftop, solar power generation system.
A better model includes some internal resistance [128, p. 9.27]. However, even this model is inadequate because the voltage of any practical battery depends on temperature, the load, the current through the battery, the fraction of capacity used, the number of times it has been recharged, and other factors [128, p. 3.2].