Short and fast versus long and slow pumping?

peterthepainterpeterthepainter Registered Users Posts: 3
We have inherited a system which pumps water from a deep well using a powerful pump (sorry no details available at present). We have a huge tank to store the pumped water ready for use. The idea, according to previous owner, was to switch the pump on 3-4 times a day for a few minutes, whereupon the available water in the well would run dry and we have to wait for it to slowly replenish itself. The powerful pump, it would seem, is putting excessive strain on our limited solar electrics too.
This seems all wrong to me. Does it not make more sense to pump very slowly (using minimal power) for a long period? perhaps constantly during the day? Hopefully the well would never dry using this method.
Any thoughts on why one system is better than the other appreciated. Thanks.


  • mike95490mike95490 Solar Expert Posts: 7,499 ✭✭✭✭
    This would be a job for Grundfos SQL Flex pumps
     They run off solar panels, and will fill the tank in daylight, but not in cloudy or dark weather.     it's not good for a well or the pump, to suck it dry and then wait for recharge, a slower withdraw rate has always seemed better, but I don't sell big well pumps either !

    SQL Flex pumps are expensive, with their control box and some PV panels, but you don't need a big honking inverter and battery bank for them.

    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    gen: ,

  • jonrjonr Solar Expert Posts: 915 ✭✭✭✭
    Would be far less expensive to use a 24VDC submersible well pump.  Or possibly a lower power version of your current pump.
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