| To calculate a motor's annual energy cost: |
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| 1. |
Enter the Horsepower rating of the motor. |
| 2. |
Enter your Average Energy Cost.
For a typical electric bill, divide the total dollars by the total kilowatt-hours to get this figure. |
| 3. |
Enter the Motor Efficiency.
Use the motor's nameplate efficiency, or use the
Motor Efficiency Guide to help determine this value. |
| 4. |
Click Calculate. |
| 5. |
Read the Annual Energy Cost for 3000, or 8000 hours annual usage.
3,000 hours usage is typical of HVAC fans and pumps that run 12 hours, 5 days a week, or 1-1/2 shift industrial plants. 8,000 hours is typical for motors running 24/7 with a few weeks shutdown. |
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| Note: Calculations assume a 75% motor loading factor. Studies show that most motors are about 75% loaded, with a few exceptions, such as compressors. |
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