Having determined the voltage and amperage requirements for the required productive capacity the DC power requirement is then known.
The simple result is :-
kWh = Volts x Amps/h
1000
kWh/kg = kWh / Kg/h NaOCl
A supplier would be able to provide more comprehensive power consumption per kg/h taking ancillary plant consumption and efficiencies into account. The main variable between suppliers however will be reflected in the DC kWh/kg quoted.