A system has 3 pumps each is a 7 HP. They run for 11 hrs/day. Electrical costs r .013/kwh. What is the monthly cost to run pumps? Assume 30 days/month
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3 pumps consume 21HP for the 11 hours. A month is 30 11-hour days of pumping=330 hours=630HP per month. To convert HP to kW we multiply by 0.7457, so 630HP-hours=469.79 kWh approx.

The cost of 469.79 kWh=R469.79×0.013=R6.11 approx.

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