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Thread: 15 month payback switching from a single to dual speed motor

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    bobodaclown's Avatar
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    15 month payback switching from a single to dual speed motor

    Hello all,
    Looking for your comments.
    I currently have a single speed 3/4 hp 115v motor. Looking at swapping in a dual speed 3/4 hp 115v motor.

    Looks like the payback period will be about 15 months. ($20 month savings). I don't have any water features.
    Currently my pump is putting out about 50gpm.

    My turnover time is about 6 hours. I'm looking at running at low speed for 12 hours. It looks like it would be a monthly savings of about $20.

    The new motor is about $300 installed that how I came up with 15 month payback.

    Anything that I'm over looking?

    2 speed hi = 50 gpm so low would be about 25gpm
    hi run time 6 hours so low would be 12 hours
    electric cost .14 cents KWH.

    Motor I'm looking at 12.4 amps high (cost $1.20 (6hrs) day)/ 2.2 amps low ($0.43 (12hrs) day) (monthly $35.94/$12.75) savings of $23.10

    I would save the current motor for a backup or possible sell on eBay.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Mod Squad Bama Rambler's Avatar
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    Re: 15 month payback switching from a single to dual speed m

    I'd figure a few hours a week on high just to be safe but that's still a pretty good payback.
    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
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    mas985's Avatar
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    Re: 15 month payback switching from a single to dual speed m

    If you are going by the motor label ratings, then the cost may be a little high. The motor will usually draw less than the label ratings which are maximum limits. Plus, the power factor has to be taken into consideration.

    I don't have any data on the P2RA5D-180L but I do for the similar PHK2RAY6D-101L which will use about 1114 watts @ 47 GPM on high and 280 watts @ 24 GPM on low speed for CEC Curve-A. So that would be $0.93/day for high speed and $0.47/day for low speed using the same run time.

    I also would agree with Bama in that you tend to run at high speed for at least a couple of hours a day to help the skimmers.
    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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    bobodaclown's Avatar
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    Re: 15 month payback switching from a single to dual speed m

    The specifics for my setup:
    Model PEA5D-180L/ Model P2RA5D-180L and I came about those models because I have C105-92PS/C1-216P impeller/diffuser.

    I currently have a B2661 New Centurion 3/4 HP motor 11.2 SF AMPS 1.67 SF
    and looking to replace it with a B2981 New Centurion dual speed motor 12.4/2.2 SF AMPS 1.67 SF motor.

    @ Mas I'm using Pump tools v002. PE5C-180L is the pump I think is closest to mine.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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