# Calculating my electrical costs

#### JimMarshall

Gold Supporter
TFP Guide
Can anyone point me to how I could determine how much electric my pool pump is using per hour?

Trying to do some math on the break even point on a VSP

#### ajw22

Gold Supporter
TFP Guide
Can anyone point me to how I could determine how much electric my pool pump is using per hour?

Trying to do some math on the break even point on a VSP
See Pool Pump Tools here --> Hydraulics 101 - Have you lost your head?

Take volts x amps = watts, watts / 1000 = kilowatts, kilowatts x hours running = KWH's (kiolwatt/hours), KWH's x your electric cost per KWH = cost.

You can figure it by any time frame you want (hour, day, week, month, etc.). It gets a little trickier if your electric utility has stepped rates. Then you have to figure out when the pump will be running and what the breakdown of charges will be.

How Much Does My Pool Pump Cost to Run? - INYOPools.com

#### JimMarshall

Gold Supporter
TFP Guide
So, based on the inyo link, my 1.5 HP pump "should" take 2.14 kW per hour to operate?

#### mas985

TFP Expert
So, based on the inyo link, my 1.5 HP pump "should" take 2.14 kW per hour to operate?
Not even close. I don't think their calculator is very accurate. For most AG pool setups, your pump will use about 1 kw.

#### JimMarshall

Gold Supporter
TFP Guide
Not even close. I don't think their calculator is very accurate. For most AG pool setups, your pump will use about 1 kw.
Im gonna stick with 2.14. That makes the break even point way more attractive when I’m talking my wife into the VSP upgrade I want.

#### back_yard_lap_pool

Silver Supporter
Hydraulics play a big role.
We have fairly long runs (~120ish foot on average) for returns, skimmers and drains so we used (2) 2” inch lines for skimmers, (2) 2” inch lines for returns and (1) 3” inch line on main drain - for each pump - to keep head loss to a minimum.

Running the pump at lower rpm has a dramatic affect on the watts vs gallons moved.

We have kind of settled on 2,000 rpm for 24x7 run time.

All that said, this is functionally just another data point as head loss varies from pool to pool.

The flow-vis shows 45 gpm while using 441 watts of power. So 9.8 watts per GPM?[emoji38]. Is that even a thing?

So two of these pumps running 24/7 moves about 130k gallon per day.
882 watts per hour at 8 cents a kWh = \$1.69 a day.

Hope this helps...