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This can be figured out fairly easily, or approximated at least by checking the pump motor label and doing some calculations. On the pump label shown here (yours may look slightly different), you will find Volts and Amps listed. In this case, it shows volts as 115/230V which means that the motor is ‘reversible’ and can be operated at either 115V or 230V. The Amps are listed as 15.0 / 7.5 – which means that at 115V the motor draws 15A, and at 230V the draw is 7.5 Amps. For a larger motor over 2hp, you will commonly see only 230V listed and a single number to represent Amps used at maximum load.

Note that the pump label or ‘name plate’ shows the Maximum Amp Draw. Many pool pumps after start-up, will pull 1-2 less amps than listed on the nameplate. They can also draw more amps than listed too, if it is too large for the system and plumbing, or there is a low-voltage problem. To get an exact reading of your amp draw, you could use an amp meter, but this requires technical several steps – Danny at Inyopools does a great job explaining how to use an ammeter on a pool pump.
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The next steps involve some math:
  1. Multiply: Volts X Amps = Watts. In our particular example, assuming 230 volts, 230V x 7.5A = 1725 Watts
  2. Divide: Watts / 1000 = KiloWatts (Kw). In our example, 1725 / 1000 = 1.725 Kw
  3. Multiply: Kw X Hours per day of running the pump. For example, 1.725 Kw X 10 hours = 17.25 kWh per day
  4. Multiply: kWh/day X Cost per Kilowatt. For example 17.25 kWh X .12 cents/kWh* = $2.07 per day
*Your cost per kWh may be higher than the national average of 12 cents, some areas of expensive electricity pay double this amount, per kilowatt hour. Check your electrical bill / statement, or login to your ‘paper-free’ provider account online, to find out what your exact rate or fee is, per kilowatt hour (kWh).
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