Calculating electic usage

[Poconos]

Another way is to use the watt-hour meter, the house electric meter. If you get ambitious and get to the right person at the electric company someone can tell you the meters calibration. Used to know what the numbers meant but that was many years ago. The info you are looking for is the Watts per revolution of the disc. Pick a time when the disc is hardly moving compared to when the pump is on, which is at a low house power time. Fire the pump and count revolutions in some time period like 10 minutes or so. Assuming 10 minutes for the sake of the calculation, figure the watts consumed in the 10 minute period by multiplying revs by the cal factor to get watts, then multiply by 6 (60 / 10) to get the number of watts in one hour. Then divide by 1000 to get KiloWatt-Hours. On your electric bill there should be a cost breakdown for $$ per KWH (KiloWatt-Hour). Knowing the number of KiloWatts per hour multiply by the cost per KWH and you will have the cost of running the pump for 1 hour. The electric meter gives you the true power consumed. Just make sure while you're counting revs that nothing in the house like a refrigerator or air conditioner kick in to mess up the reading. (ajs-1)
Hope this helps.
Al