Hi All,
I have the Waterway Power Defender 140 1.4HP Variable Speed Pump PD-140. We have 1 skimmer, 3 return vents, and a Zodiac G3 pool cleaner. The run schedule when I moved in was set at 3450 RPM (max speed) for 4 hours from 8am-noon and 1250 RPM for 12 hours from 8pm-8am. I have found that the automatic pool cleaner works best at that high speed and doesn't do very well at lower speeds (duh). At 1250 RPM there isn't enough power to open the skimmer's weir door so it's more for some very low speed circulation (which I know TFP doesn't really care about). I want to more efficiently run my pump to ideally save some money and/or skim the pool a little bit more.
First, I want to figure out/confirm how to calculate my power consumption.
At full power, 1.40HP 3450 RPM, I think the power consumption is right around 2 kWh. I don't know if I'm using 115 or 230 VAC so I'll assume it's about 2 kWh. Now for the variable speeds. From the pump's manual "By reducing your speed to 50% RPM, the horsepower requirement is reduced to 1/8th of the 100%. The calculation is as follows: (50/100 * 50/100 * 50/100) =.125 or 12.5%.)" So at 1250 RPM, which is roughly 36% RPM it should use (36/100 * 36/100 * 36/100) = 0.0466 or 4.66% of the 2kWh giving the hourly power consumption of 1250 RPM to be 0.093kWh. So my current schedule of 3450/4 hours and 1250/12 hours should consume roughly (2kWh*4h)+(.093kWh*12h) = 9.116kW. Is that correct? With an off peak (8pm-3pm) energy charge of $0.05230, I'm paying roughly 0.05230*9.116=$0.476/day or $14.77 a month? Is that right? If so, that's pretty low already and I might just cut out the 12 hours of super low power and replace it with a few hours of enough power to do some skimming.
Sorry for spewing all that math (especially if it's wrong) - but does that all seem correct? Any other suggestions. Thanks as always for everyone's help
I have the Waterway Power Defender 140 1.4HP Variable Speed Pump PD-140. We have 1 skimmer, 3 return vents, and a Zodiac G3 pool cleaner. The run schedule when I moved in was set at 3450 RPM (max speed) for 4 hours from 8am-noon and 1250 RPM for 12 hours from 8pm-8am. I have found that the automatic pool cleaner works best at that high speed and doesn't do very well at lower speeds (duh). At 1250 RPM there isn't enough power to open the skimmer's weir door so it's more for some very low speed circulation (which I know TFP doesn't really care about). I want to more efficiently run my pump to ideally save some money and/or skim the pool a little bit more.
First, I want to figure out/confirm how to calculate my power consumption.
At full power, 1.40HP 3450 RPM, I think the power consumption is right around 2 kWh. I don't know if I'm using 115 or 230 VAC so I'll assume it's about 2 kWh. Now for the variable speeds. From the pump's manual "By reducing your speed to 50% RPM, the horsepower requirement is reduced to 1/8th of the 100%. The calculation is as follows: (50/100 * 50/100 * 50/100) =.125 or 12.5%.)" So at 1250 RPM, which is roughly 36% RPM it should use (36/100 * 36/100 * 36/100) = 0.0466 or 4.66% of the 2kWh giving the hourly power consumption of 1250 RPM to be 0.093kWh. So my current schedule of 3450/4 hours and 1250/12 hours should consume roughly (2kWh*4h)+(.093kWh*12h) = 9.116kW. Is that correct? With an off peak (8pm-3pm) energy charge of $0.05230, I'm paying roughly 0.05230*9.116=$0.476/day or $14.77 a month? Is that right? If so, that's pretty low already and I might just cut out the 12 hours of super low power and replace it with a few hours of enough power to do some skimming.
Sorry for spewing all that math (especially if it's wrong) - but does that all seem correct? Any other suggestions. Thanks as always for everyone's help