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Thread: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

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    KatyTXPoolOwner's Avatar
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    Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    I am trying to figure out if I am interpreting the data from my main pump correctly, with the ultimate goal of running the main pump as cost effectively while maintaining a well-filtered and clean pool.

    Here's what I see on the display when I check "Status":
    GPM 35
    RPM 1580
    Watts 326

    Local electric rate is $.06/kWh

    Current Main Pump Run Schedule:
    I run the pump 15 hours a day (7:00am - 8:00pm and 12:30am - 2:30am daily), which should turn approximately 31500 gallons everyday.

    The way I calculate it (see below), the above information puts me at $9.10 total for 31 days, which seems a little hard to believe (I think it would cost more).

    $.06 kWh rate
    x .326 kWh used (326 Watts from Pump display)
    x 15 hours a day
    x 31 days a month
    = $9.10 electricity cost to run main pump only for 15 hours a day for 31 days a month

    Is my approach correct? If not, can someone point me to a more accurate calculator?

    Thank you!
    23,000 gallon gunite chlorine pool / spa .. French Gray Pebble Sheen .. IntelliFlo VF main pump .. IntelliFlo VS spa booster pump .. WhisperFlo 1HP water feature pump .. LA01N .75HP cleaner booster pump .. Letro Legend Platinum cleaner .. Quad DE 100 filter .. Max-E-Therm 400k heater .. Rainbow 320 chlorinator .. 1.5HP blower .. Easy Touch 8 remote control .. 8 Twirlybyrd jet spa .. Paralevel .. TF-100 w/SpeedStir

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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    326 W seems small...what is the voltage and amperage rating for your pump? What is the brand? A 5 amp, 220V pump consumes an instantaneous power demand of 1,100W, or 1.1 kW (220 x 5). Running this pump for 1 hr will consume 1.1 kWh of electricity. Running it for 2 hours, will draw 2.2 kWh of energy, and so on.




    68,000litre, IG vinyl, LorentzPS 600 Solar Pump & 1/2 HP Tristar, Sandfilter, Aquarite T-15 SWG
    20000 gallon, IG, SWG, Sand Filter, Hayward 1/2HP + Lorentz direct solsr PV pump

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    KatyTXPoolOwner's Avatar
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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Pump is Pentair IntelliFlo Variable Flow (Pentair Product number 011012)
    Voltage 230
    Full Load Amps 16
    23,000 gallon gunite chlorine pool / spa .. French Gray Pebble Sheen .. IntelliFlo VF main pump .. IntelliFlo VS spa booster pump .. WhisperFlo 1HP water feature pump .. LA01N .75HP cleaner booster pump .. Letro Legend Platinum cleaner .. Quad DE 100 filter .. Max-E-Therm 400k heater .. Rainbow 320 chlorinator .. 1.5HP blower .. Easy Touch 8 remote control .. 8 Twirlybyrd jet spa .. Paralevel .. TF-100 w/SpeedStir

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    Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Well then something is wrong with your readout. If The pump is consuming 326 W, and is wired for 230V, then it is only consuming 1.4 amps (326/230). That seems very low....

    Operating at full load (16 amps), then the pump consumes 3,680W, or 3.68 kW. Operating at this load for 15 hours, yields a total energy draw of 55.2 kWh, costing you $3.31/day or $100/month.




    68,000litre, IG vinyl, LorentzPS 600 Solar Pump & 1/2 HP Tristar, Sandfilter, Aquarite T-15 SWG
    20000 gallon, IG, SWG, Sand Filter, Hayward 1/2HP + Lorentz direct solsr PV pump

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    Mod Squad Jimrahbe's Avatar
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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Katy......r,

    If you want your electric bill to be higher, I'll gladly send you mine..

    You have discovered the wonder of having a VS/VF pump. The "full load amps" figure is meaningless unless your were running the thing at full speed. My VS Intelliflo only uses 172 watts at 1200 RPM where I run it most of the time.

    Your numbers look correct to me.

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Calder Spa.

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    KatyTXPoolOwner's Avatar
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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    The Max GPM for the pump is 130. I have it set for 35 GPM, which is 26.9% (35/130) of the maximum. Is it correct to look at it that way?
    23,000 gallon gunite chlorine pool / spa .. French Gray Pebble Sheen .. IntelliFlo VF main pump .. IntelliFlo VS spa booster pump .. WhisperFlo 1HP water feature pump .. LA01N .75HP cleaner booster pump .. Letro Legend Platinum cleaner .. Quad DE 100 filter .. Max-E-Therm 400k heater .. Rainbow 320 chlorinator .. 1.5HP blower .. Easy Touch 8 remote control .. 8 Twirlybyrd jet spa .. Paralevel .. TF-100 w/SpeedStir

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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?


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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Well this is a while new world to me. 172 Watts???? Wow!!


    68,000litre, IG vinyl, LorentzPS 600 Solar Pump & 1/2 HP Tristar, Sandfilter, Aquarite T-15 SWG
    20000 gallon, IG, SWG, Sand Filter, Hayward 1/2HP + Lorentz direct solsr PV pump

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    KatyTXPoolOwner's Avatar
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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Anybody else out there able to support me and Jimrahbe?

    If so, I guess I'm REALLY happy to have told my builder to put in the Pentair IntelliFlo Variable Flow pump. Hard to beat less than $10/month when it's running 15 hours every day.


    23,000 gallon gunite chlorine pool / spa .. French Gray Pebble Sheen .. IntelliFlo VF main pump .. IntelliFlo VS spa booster pump .. WhisperFlo 1HP water feature pump .. LA01N .75HP cleaner booster pump .. Letro Legend Platinum cleaner .. Quad DE 100 filter .. Max-E-Therm 400k heater .. Rainbow 320 chlorinator .. 1.5HP blower .. Easy Touch 8 remote control .. 8 Twirlybyrd jet spa .. Paralevel .. TF-100 w/SpeedStir

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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Just make sure that you have good surge protection for the pump. If you have to replace the pump at $1,000 due to a surge, all your savings goes away. The pump is a high powered motor controlled by an onboard computer, and is very sensitive to surges and power spikes.

    I actually have two "whole house" type surge protectors. A larger one on my main service panel that protects all my electronics, and a smaller one on my pool sub panel for additional protection on the pump and other pool equipment. About $150 and one afternoon well spent.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Quote Originally Posted by KatyTXPoolOwner View Post
    Anybody else out there able to support me and Jimrahbe?

    If so, I guess I'm REALLY happy to have told my builder to put in the Pentair IntelliFlo Variable Flow pump. Hard to beat less than $10/month when it's running 15 hours every day.


    Sent from my iPhone using Tapatalk
    I agree that VS pumps can save a lot of money if used properly and in a high utility rate area of the country. If a person is doing a new build, a variable speed pump is almost always the best choice because the incremental cost of the equipment is tiny compared to the overall build cost. For people with existing pools, the high entry cost of a VS pump can make it an unattractive option as a low utility rate means one will never really recoup in savings the original capital outlay. In many cases, for an existing pool installation, just simply swapping out a single-speed motor (and impeller) with a properly sized 2-speed motor will still save a lot of money and allow one to recoup the cost of the new motor very quickly.

    The only issue I take with your setup is that you spent extra money on the variable flow pump instead of just using the variable speed pump. Being able to precisely dial in flow rates is really totally unnecessary as the concept of having a specific number of turn-overs per day is an old concept that has no real meaning. Pump studies have shown that people can't tell the difference between a pool that has had a lot of turnovers per day versus one or two turnovers. What matters to a pool is water quality and filtration and that is typically satisfied with only a few hours of pump time. Also, if one has the pumping curve and power output from a VS pump as well as the RPM's and system pressure, it's a fairly simple calculation to look up the flow rate of the system therefore it's not even necessary to have a fancy flow meter installed into the plumbing. SO you paid a little extra for the VF option which, I admit, is neat but it is is not necessary. Also, when you set a specific flow rate on the pump, the pump is going to vary the RPM's to get the desired GPMs. This means your actual power level is going to rise as the filter load increases so you can't assume that it is going to be the same number of watts everyday.

    It's all no big deal but I would have ditched the VF option just to save some money.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    KatyTXPoolOwner's Avatar
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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Appreciate the feedback. I'm not sure but at the time if pool build I believe the VF and VS pumps were nearly identical in price, maybe even the same.


    23,000 gallon gunite chlorine pool / spa .. French Gray Pebble Sheen .. IntelliFlo VF main pump .. IntelliFlo VS spa booster pump .. WhisperFlo 1HP water feature pump .. LA01N .75HP cleaner booster pump .. Letro Legend Platinum cleaner .. Quad DE 100 filter .. Max-E-Therm 400k heater .. Rainbow 320 chlorinator .. 1.5HP blower .. Easy Touch 8 remote control .. 8 Twirlybyrd jet spa .. Paralevel .. TF-100 w/SpeedStir

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    mas985's Avatar
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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Quote Originally Posted by KatyTXPoolOwner View Post
    The Max GPM for the pump is 130. I have it set for 35 GPM, which is 26.9% (35/130) of the maximum. Is it correct to look at it that way?
    No. 130 GPM is run out. The pump will never achieve that.

    You need to know your plumbing curve. Typical 2" plumbing will have a max flow rate of about 100 GPM, 1 1/2" plumbing, the max flow rate drops to about 73 GPM. But your results may vary.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    KatyTXPoolOwner's Avatar
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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Pool is plumbed with at least 2", maybe 2.5. Spa is plumbed with 3" return and suction.


    23,000 gallon gunite chlorine pool / spa .. French Gray Pebble Sheen .. IntelliFlo VF main pump .. IntelliFlo VS spa booster pump .. WhisperFlo 1HP water feature pump .. LA01N .75HP cleaner booster pump .. Letro Legend Platinum cleaner .. Quad DE 100 filter .. Max-E-Therm 400k heater .. Rainbow 320 chlorinator .. 1.5HP blower .. Easy Touch 8 remote control .. 8 Twirlybyrd jet spa .. Paralevel .. TF-100 w/SpeedStir

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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    It is true how little power these vs pumps use. they say that they are most efficient at about 800 rpm. you might be able to save a bit more if you run 24 hrs at lower speed. you still need to make sure its turning the pool the amount you want though. I run at 2800(I think) for 2hr and 800 the rest. I do the 2800 for my vacuum but it looks like you don't have one based on the lower rpms for 15hr
    aprox 18k in ground

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    mas985's Avatar
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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Quote Originally Posted by barnnns1
    you might be able to save a bit more if you run 24 hrs at lower speed.
    You will save 6x more with 4 hrs.


    you still need to make sure its turning the pool the amount you want though.
    Turnover is irrelevant. Please read pool school: Pool School - Determine Pump Run Time
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    KatyTXPoolOwner's Avatar
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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Yes, I have a vacuum I just didn't include that in the description. It runs 2 hours x 3 days a week at 85 GPM.


    23,000 gallon gunite chlorine pool / spa .. French Gray Pebble Sheen .. IntelliFlo VF main pump .. IntelliFlo VS spa booster pump .. WhisperFlo 1HP water feature pump .. LA01N .75HP cleaner booster pump .. Letro Legend Platinum cleaner .. Quad DE 100 filter .. Max-E-Therm 400k heater .. Rainbow 320 chlorinator .. 1.5HP blower .. Easy Touch 8 remote control .. 8 Twirlybyrd jet spa .. Paralevel .. TF-100 w/SpeedStir

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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    oh is the rpms to low for the vac. that's how mine is. its always hooked up but only has enough suction when the rpms are higher.
    Quote Originally Posted by KatyTXPoolOwner View Post
    Yes, I have a vacuum I just didn't include that in the description. It runs 2 hours x 3 days a week at 85 GPM.


    Sent from my iPhone using Tapatalk
    aprox 18k in ground

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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    sorry I just always use the term turnover from my aquarium days. pool school recommends 8hrs if you can run on lower speed and more if you feel its needed. I was thinking the amount of time the pump was running is whats needed for that pool. Only pointing out it could maybe run the same volume of water for less money.
    Quote Originally Posted by mas985 View Post
    You will save 6x more with 4 hrs.


    Turnover is irrelevant. Please read pool school: Pool School - Determine Pump Run Time
    aprox 18k in ground

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    Re: Am I Interpreting Pump GPM RPM and Watts Numbers Correctly?

    Quote Originally Posted by KatyTXPoolOwner View Post
    Anybody else out there able to support me and Jimrahbe?


    Sent from my iPhone using Tapatalk
    My VS low speed is set for 1400RPM and shows 164w
    IG Tear Drop, Dark Gray Gunite , 27,000 gallons -Age 50+-years, very old Hayward Split Egg Sand Filter with side mount Multi-port- Hayward SP2600VSP Pump- Hayward chlorine feed (not used since finding TFP) - Laars 315K BTU Oil heater- LoopLoc Safety cover- AquaBot RAPIDS 4WD- TF-100 Test Kit w/ Speedstir- 390 Gal Hot Springs Spa Envoy installed May 2017

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