22kw Well pump

STH Solar
STH Solar Registered Users Posts: 1
I have 22kw water pump that I want to run of PV.
What size panels should I use?
Do I drive the motor with an inverter or a VFD?
If VFD, then how do I program it?


  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
    Re: 22kw Well pump

    Make, model, amount of water to be pumped, in daylight or 24 hr per day and location of this project will help start the discussion... also availability of PV and charge controllers etc.
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    Re: 22kw Well pump

    That's a HUGE pump, and will need a lot of expensive solar panels. 22KW ? are you sure?
    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 ||
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,439 admin
    Re: 22kw Well pump

    Perhaps you can find some starting infomration in these threads:
    BB. wrote: »
    Some discussions about VFD (Variable Frequency Drives)... Basically a variable frequency inverter with (typically) three phase output. Used to soft start motors (handy for 3 phase well pumps, or pumps with well head starting capacitor) and can also turn an AC motor into a variable speed motor (very handy for pumping applications).

    WELL PUMP and Inverter QUESTION

    Wind/solar for large scale pumping etc (out of my depth!)
    could use knowledge - using Gould jet pump - transfering from 230vAC to ? DC (new link/thread 10/27/2012)
    Help required to design off grid system (information on possibilities to connect "standard VFDs direct to solar panels) (new link 1/13/2013)


    The last one is real interesting. Using a "standard" (I think) VFD directly fed from solar array (out of Pakistan). Poster left a little information out of the final design.

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset