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Thread: Converting to a dual speed motor

  1. Back To Top    #1

    Join Date
    Apr 2014
    Palm Desert, CA.

    Converting to a dual speed motor


    My swimming pool (approximately 10,000 gallons) is currently equipped with a 3/4 HP Pentair WhisperFlo single speed pump that I run for 6 to 8 hours a day depending on the time of year. I am interested in buying a new dual-speed pump motor to save energy and saw that you had purchased a 3/4 HP dual-speed Century B2980 pump motor a few years ago. I would really appreciate if you could answer a couple of questions for me. I am curious on how many hours a day you run your new dual-speed motor and how much energy savings you have experienced with it. The guys down at the pool store want to sell me an entire new variable speed pump/motor for around $1200, as they say it would be even more efficient than a dual-speed pump motor replacement. However, it seems to me that I would probably save about as much energy simply by converting to the dual-speed Century B2980 pump motor (at a cost of about $320 delivered) and running it exclusively on the low speed. I'd really appreciate your thoughts or any advice that you'd be willing to share.

    Thanks, Joe

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Converting to a dual speed motor

    The crucial question is how high are your electrical rates. Very high electricity costs can justify the extra costs of a variable speed pump.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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