The deal of a lifetime…

The deal of a lifetime …

Here’s a question that more of us should know the answer. How much water can you get for $1?

With a submersible water system, it’s easy to figure out. We just need to know 3 things:

  1. The GPM delivered by the pump
  2. The power consumption of the motor turning that pump
  3. The price of electricity.

For our example, we’ll use the most common unit in the United States, a ½ horsepower, 10 GPM pump. We can ignore whether its 2- or 3-wire, since the power consumption is identical for both units.

From page 13 of the Franklin Electic AIM Manual, the power consumption of a ½ hp motor is 0.96 kilowatts. But, we pay for electricity in terms of kilowatt-hours. That is, the number of kilowatts used multiplied by the number of hours we used those kilowatts. So, if we run that ½ pump for 1 hour, we’ll consume 0.96 kilowatt-hours (0.96 kilowatts x 1 hour).

According to the latest figures from the US Department of Energy, the average retail price of electricity in the US is 9.7 cents per kilowatt-hour. For the sake of keeping the math simple, we’ll just round that to 10 cents.

So, putting it all together, if we run that pump for 1 hour, we’ll pay:

0.96 kilowatt-hours x 10 cents = 9.6 cents

To get to $1, we would need run the pump about 10.4 hours, or 624 minutes (10.4 hours x 60 minutes in an hour). With our 10 GPM pump, that would mean 6,240 gallons for a dollar.

So, for $1, we provided over 6000 gallons of water. A pretty good deal, huh?

6 thoughts on “The deal of a lifetime…

  1. Pingback: Column-by-Column: Full Load Amps and Max Amps | Franklin AID

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