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Thread: Energy efficiency

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    Join Date
    Jul 2015
    Location
    Baton Rouge, LA
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    Energy efficiency

    Our local utility rate is 8.2cents/kwh. For a pool my size should I consider changing to a variable speed pump motor?
    Gunite- in ground in south Louisiana 19,000 gallons, Rectangular shape
    Legend Platinum cleaner with 3/4 hp booster pump.
    Pentair FNSP 36 D.E. filter.
    Hayward Goldline with T-15 cell - SWG
    Hayward Wisperflow with A.O. Smith 1 hp main pump

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    Mod Squad Bama Rambler's Avatar
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    Re: Energy efficiency

    At 8.2¢/KWH you'll never offset the cost of a VS, and I don't think LA offers any kind of incentive for switching. I'd definitely consider getting a 2-speed especially if your current pump is getting some age on it, as it'll pay for itself in a few years. You'd do even better switching that booster pump cleaner out for a robot.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    PoolESQ's Avatar
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    Albuquerque, NM
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    Re: Energy efficiency

    What seems to be the break even point from a KWH standpoint? My rates are tiered: First 450 are 9¢, Next 450 are 14¢ and anything above that is 16¢. I use ~2200 KWH per month in the summer.
    Replastered 2015: Sunstone Quartz Midnight Blue 16x32 rectangular gunite with in-pool spa....18,000 gallons. Autopilot Total Control System with SWG and acid pump. Pentair Clean & Clear 420. Auto cover. TF-100.

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    BoDarville's Avatar
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    Re: Energy efficiency

    Purely from an energy usage standpoint, the breakeven point between going with a variable-speed vs. a 2-speed is around $0.20 per kWh. Aside from energy usage, other factors to consider in deciding between a 2-speed and VS pump include the number of water features and how much control you want over each of them. The more water features you have and the more you want to control them individually, a VS pump will give you more options. OTOH, if you don't have many (or any) water features, the 2-speed is the better choice, especially given your electric rate.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
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    PoolESQ's Avatar
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    Dec 2007
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    Albuquerque, NM
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    Re: Energy efficiency

    Thanks Bo. I do not have any water features, but I do have an in-floor cleaning system. Not sure how a VS or 2-speed would work in that situation.
    Replastered 2015: Sunstone Quartz Midnight Blue 16x32 rectangular gunite with in-pool spa....18,000 gallons. Autopilot Total Control System with SWG and acid pump. Pentair Clean & Clear 420. Auto cover. TF-100.

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    Mod Squad Bama Rambler's Avatar
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    Re: Energy efficiency

    Is the infloor system the only returns in the pool?
    How often does the infloor system run?

    Infloor systems require a lot of pressure for the heads to operate properly, and if they're the only returns to the pool then a 2-speed will most likely only work on high, and a VS will have to be ran at such a high speed that it may not save much over a single speed pump. Especially at 8.2¢/KWh
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  7. Back To Top    #7

    Join Date
    Jul 2015
    Location
    Baton Rouge, LA
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    2

    Re: Energy efficiency

    Thanks for the valuable info.
    Gunite- in ground in south Louisiana 19,000 gallons, Rectangular shape
    Legend Platinum cleaner with 3/4 hp booster pump.
    Pentair FNSP 36 D.E. filter.
    Hayward Goldline with T-15 cell - SWG
    Hayward Wisperflow with A.O. Smith 1 hp main pump

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