The factory in Retreat, Cape Town, runs heavy load on a time-of-use tariff. Power in the peak windows costs several times the off-peak rate, and a single spike in demand would inflate the bill for the entire month.
The brief was specific: reduce the cost by reducing the spikes in demand, with no solar attached.
Two jobs every weekday. Electricity costs more per unit in the weekday morning and evening peaks, so the battery charges off-peak and provides power during peak.
Illustrative weekday. Shaded windows show time-of-use periods; the battery charges in the cheap hours and carries the factory through the peaks.
Bought outright. The saving increases as the tariff increases. This installation is set to pay for itself within four years and seven months.
From the project’s own cash-flow projection at 2 873 910 kWh a year. In the first year the bill falls from R8 207 137 to R7 096 305, a saving of R1 110 832.
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