So, I am trying to decide whether or not to pull the trigger and replace my working single speed pump with a 2 speed to save some money on my electric bill.
I currently have a 1HP single speed Waterway pump with an AO Smith motor. I usually run it for 12hrs/day, 2 cycles of 6hrs, but this year I cut back to 10hrs. I haven't been able to figure out my flow rate, so I have no clue how long a turn over takes. Maybe you can help me figure that out too... . My electric rate is approximately $0.185/kwh.
Using Jason's basic calculation of 1HP = 1kwh, I get the following:
1kwh x 10hrs = 10kwh/day to run pump
10kwh x 30 days = 300kwh/month
300kwh x $0.185 = $55.50/month to run the pump
I'm looking to replace it with a Hayward Power-Flo Matrix 1HP dual speed. I can't find the stats on it for high or low, so I can't calculate how much it will cost to run. I guess if low uses 1/4HP and I use the same assumptions and calculation, it would cost me $33.33/month to run 24hrs. That is a savings of $22.20/month. That's if I am calculating this right and the 1:1 assumption is the same.
I have found the pump online for $258 and $299. Since I run the pump 5-6 months/yr, it would take about 2 1/2 seasons for me to break even, assuming my rates stay the same.
Another thing for me to consider is the Liquidator. I did the 3/8" conversion and it increased my flow, but I still have to close the valve from the skimmer slightly to get a flow of about 2.5. I do that instead of opening the flow valve all the way because I don't want to run the chance of the pump kicking on and getting too high of a flow. Would running the pump on low work with the liquidator?
What do you think? Are my calculations correct and if so, should I make the change?