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Low watt pump

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oldsolar
oldsolar Member Posts: 7
in Solar
I’m looking for low watt pumps, line AC most of the time with solar inverter AC power during outages. Minimum power consumption is the goal. As planned, the system will be ½ “copper pipe, drainback to 10G atmospheric pressure tank, head to collector 6’.The second loop is the HX in drainback tank to 80G storage, head from storage to drainback tank HX is 9’. I’m looking at Taco 007 1/25hp at 80w.I would like a lot lower consumption. How can I get there? Any suggestion would be great.

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  • SWEI
    SWEI Member Posts: 7,356
    edited November 2012
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    AC powered ECM pump

    Check out Laing Thermotech http://completewatersystems.com/product/e-series-brass/



    Also available with a B&G label.
  • hot_rod
    hot_rod Member Posts: 22,133
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    Grundfos Alpha

    is what i have on a couple of my DB systems. It has 3 fixed speeds and consumes about 1/2 of a standard wet rotor circ.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Kevin_in_Denver_2
    Kevin_in_Denver_2 Member Posts: 588
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    Only Friction Head on Second Loop

    On the second loop, you don't need a pump with 9' head capability. That loop is full of water all the time and it's at city pressure. So you just need to overcome the friction head at a flowrate of 1-3gpm.



    This pump is worth looking at for the second loop because it only pulls 9W :

    www.sun-pump.com
    Superinsulated Passive solar house, Buderus in floor backup heat by Mark Eatherton, 3KW grid-tied PV system, various solar thermal experiments
  • oldsolar
    oldsolar Member Posts: 7
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    Low watt pump 12v

    Those 12v low use pumps look good. Could be wired directly (through controller) to bat bank with reasonable gauge wire. Now I understand about head and friction head which means designing for lowest energy use is more doable.
  • oldsolar
    oldsolar Member Posts: 7
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    more on low energy pumps

    Does anyone know were “sun-pump.com”went? I can’t seem to access the site.

     Low consumption 12v small size hot fluid pumps seemed just right. Any ideas on another maker of a pump with spec like theirs.

         12 to 24 v dc @ .8 amps 2.6 gal per minute, max lift 7’6” or 1.2 amp for 9’ 11” lift.
  • hot_rod
    hot_rod Member Posts: 22,133
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    several choices

    March, ElSid, B&G/ Laing. the B&G Laing is a very nice, high efficiency pump, 8-30V I believe.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Kevin_in_Denver_2
    Kevin_in_Denver_2 Member Posts: 588
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    Chinese Topsflo Pump

    http://www.amazon.com/GPM-8-5-LPM-Solar-Water/dp/B0075J5GEY/ref=sr_1_1?s=hi&ie=UTF8&qid=1362039584&sr=1-1&keywords=topsflo+pump
    Superinsulated Passive solar house, Buderus in floor backup heat by Mark Eatherton, 3KW grid-tied PV system, various solar thermal experiments
  • Kevin_in_Denver_2
    Kevin_in_Denver_2 Member Posts: 588
    Options
    Chinese Topsflo Pump

    http://www.amazon.com/GPM-8-5-LPM-Solar-Water/dp/B0075J5GEY/ref=sr_1_1?s=hi&ie=UTF8&qid=1362039584&sr=1-1&keywords=topsflo+pump
    Superinsulated Passive solar house, Buderus in floor backup heat by Mark Eatherton, 3KW grid-tied PV system, various solar thermal experiments
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