5Kw borehole pump





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  1. #1
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    Default 5Kw borehole pump

    I have a 3 phase, 5 Kw borehole pump.
    This pump runs 24/7
    Average monthly cost is about R6500 - R7500
    I want to install a solar system that can run this pump 24/7
    To run this pump on solar during the day is easy but 24/7 is a lot different
    Can someone assist me with designing a basic sysytem.

    Regards

    A&B

  2. #2
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    Default Re: 5Kw borehole pump

    Quote Originally Posted by A&B View Post
    I have a 3 phase, 5 Kw borehole pump.
    This pump runs 24/7
    Average monthly cost is about R6500 - R7500
    I want to install a solar system that can run this pump 24/7
    To run this pump on solar during the day is easy but 24/7 is a lot different
    Can someone assist me with designing a basic sysytem.
    Regards
    A&B
    .
    Hi A&B,
    It would cost way too much to run off batteries.
    Rather install a second similar borehole with pump and run both off solar in daytime only, no batteries.
    Then you have some water even if one system is down.

  3. #3
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    Default Re: 5Kw borehole pump

    My semi educated guess on running that of solar only will put you back R750k.

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  5. #4
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    Default Re: 5Kw borehole pump

    5kW @ full load should be at least 7.5A

    So we're talking about a night time capacity of at least 105Ah.

    So even a deep cycle battery @ 60% depletion means a 150Ah battery, then we have to calculate how many batteries, then we have to look at inverter losses and the cost of a 3ph inverter.

    Daytime means you must have enough panels to run the pump AND fully charge the batteries.

    Sounds bloody expensive.

    I'd say a nice 10kva 3ph diesel gennie will be cheaper. MUCH cheaper.
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  6. #5
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    Default Re: 5Kw borehole pump

    Not to mention cloudy days.

  7. #6
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    Default Re: 5Kw borehole pump

    Does a three phase motor draw less amps than a single p0hase motor? Would a clever pump not bring the cost down> I am referring to installing a vfd or does this pump work hard all the time and there would be no gains.?

  8. #7
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    Default Re: 5Kw borehole pump

    Consider Grid-tie ,you should be able to save around 40% of your electricity bill. Are you connected to Eskom or Muni?
    Die ren is 'n dag nader as gister.

  9. #8
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    Default Re: 5Kw borehole pump

    Quote Originally Posted by plunger View Post
    Does a three phase motor draw less amps than a single p0hase motor? Would a clever pump not bring the cost down> I am referring to installing a vfd or does this pump work hard all the time and there would be no gains.?
    yes it does draw less amps

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  10. #9
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    Default Re: 5Kw borehole pump

    Holy cow. Oops theres more. Make that cows.
    Cheers

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  12. #10
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    Default Re: 5Kw borehole pump

    Install 10kw grid tie system

  13. #11
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    Default Re: 5Kw borehole pump

    If you want to run that pump 24/7 off grid it is going to cost you.
    Power usage for the day 5 x 24 = 120 kwh


    Let's say 9h/day solar.
    15 x 5kw/h on battery = 75kw/h

    3.5kw pylontech battery @ R20k @ 60% DOD you need around 35 of them @ R700k just for the battery.

    You can build a decent storage tank that can be filled up during the day.
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  14. #12
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    Default Re: 5Kw borehole pump

    Quote Originally Posted by A&B View Post
    I have a 3 phase, 5 Kw borehole pump.
    This pump runs 24/7
    Average monthly cost is about R6500 - R7500
    I want to install a solar system that can run this pump 24/7
    To run this pump on solar during the day is easy but 24/7 is a lot different
    Can someone assist me with designing a basic sysytem.

    Regards

    A&B
    Hi A&B
    I use a 10000 liter JO JO tank together with a solar borehole pump. No battery backup.
    Pump while the sun shines and switches off when full. I use my 3phase pump only when the JO JO is near empty.
    I have never run out of water and used the 3ph once in the past 6 months.

  15. #13
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    Default Re: 5Kw borehole pump

    Hi AB

    The battery pack needed for this type of system is going to be a big one hey...
    Does the pump run permanently,or on-off when tanks are full?
    Looking at round about +- 90kwh ,looking at about round about x60 330 watt panels to get you to the 90kwh for the batteries and then say additional 5.5kw-6kw panels(10%loss) to run the pump through the day,Lithium would be best choice when looking at return on this type of investment..
    Also a panel array to fill these batteries up... If you are going to decide on not using lithium and gel or lead acid rather,make sure to have panel array that can really charge at good AMPS,will make help the lifespan on the gel or lead acid batteries...
    Feel free if you any other questions,please feel free to ask hey... That R6500 a month,is that 6000kwh a month,or less?

    Regards
    Danie

  16. #14
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    Default Re: 5Kw borehole pump

    Not enough information. Lots of ifs and buts......but

    If you only want to displace the power consumed with solar power then a 30 kW solar peak grid tied system will about zero your consumption costs ( If....you can spin back the mechanical meter).

    The 2019 Eskom grid line rental will always be less than that the (2019 info) lifetime costs of batteries.

    For the typical pattern loadshedding days and hours and not the SHTF zombie scenario, a generator will be the stingy, practical man's solution. Power the pump with a VSD ( for the soft start characteristics) and you will be able to get away with a sub 10 kVa generator depending on what other heavy consumers need to be powered.

    Or... physics and laws of energy says, in general....get a solar VSD inverter to power a conventional 380V 3ph 30 kW pump motor ( not sure of submersibles available in this size, but definitely Mono type yes) to fill a bigger water reservoir in 4.5 hours (sunlight hours) to allow for the same water availablity that a 5.5 kW pump can supply over 24 hours ( ...smells expensive)
    Last edited by vlakkie; 2019/10/15 at 04:48 PM.
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  17. #15
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    Default Re: 5Kw borehole pump

    https://youtu.be/8wnUtAhO6QU

    And example of what you want locally.

    May I suggest that you sit down when you look at the SMA prices

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