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Thread: Solar heater question with 2 speed pump

  1. Back To Top    #1

    Join Date
    Jul 2014
    orlando fl

    Solar heater question with 2 speed pump

    I've been reading on the board here that most 2 speed pumps cannot prime solar panels, but that it may be possible if the pump ran on high, then switched to low? I have an installer scheduled to come out and install 7 FAFCO Sunsaver panels. I have a 2 story house. My pump is a 1.5 HP Jandy Flo-Pro 2 speed pump, with cartridge filter. I have no water features or spa, and dual Intermatic timers (one controls on / off, other pump speed).

    Anyone know if it would be possible to start the pump on high, then switch to low? I want to get the energy savings of my low speed, rather than have to run the darn thing on high all the time.

    I know I can get additional pins for the timers to cycle the pump speed - but I'm wondering if it will work. The solar installer doesn't like 2 speed pumps, which is not a good sign.

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Solar heater question with 2 speed pump

    Solar is most efficient on high speed. Not likely going to work on low on 2 story house. Just use low when solar not needed, that is what I do.

    Some solar controllers will automatically switch pump speeds when solar is on or off ... highly recommend that.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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