9kW Motor

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umairde1
umairde1 Registered Users Posts: 3 ✭
in Off Grid Solar & Battery Systems #1
Hi,
Good day!
We have 9kWe, 180VDC DC motor for our water pumping system.
I need to operate this motor for 30mins after every 1 hour for 9 hours from 10am to 6 pm.
We don't have any electricity source so we need Solar solution there, need your help to design this.
Looking forward to your support.

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  • icarus
    icarus Solar Expert Posts: 5,436 ✭✭✭✭
    #2
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    Would that be 30 minutes every hour for 9 hours, for a total daily run time of 4.5 hours?  It would be important to know where you are.  Doing any solar analysis or giving any solar advice/support is hard lacking essential information.  It would also be important to know if there is a different pumping regiment that would deliver the quantity net/net you require.  I am assuming that a 9 kw pump is a livery large pump, and will require ALOT of solar to power.

    Give us more detail and perhaps we can actually help,  good luck and keep in touch,

    Tony
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  • umairde1
    umairde1 Registered Users Posts: 3 ✭
    #3
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    Yes 4.5 hours and I am from Pakistan.
    Yes it is large pump.
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  • icarus
    icarus Solar Expert Posts: 5,436 ✭✭✭✭
    #4
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    What are your pumping requirements?  (Not time, but Gallons or Litres per hour/day?) What are you pumping?  How do you pumps now?
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  • umairde1
    umairde1 Registered Users Posts: 3 ✭
    #5
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    We are pumping water for cooling tower, 275 GPM
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #6
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    Being able to run a smaller pump at a more steady rate, will be easier, if you're system can use a lower, but continuous flow. 

    What will be the backup plan if there is a cloudy day and no solar power ?
    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

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    edited December 2019 #7
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    Just to throw a few numbers out there...
    9kw x 4.5hrs = ~40kwh/day.  2 days no sun = 80kwh ÷50% max battery discharge = 160kwh.  160kwh/48v = ~3500ah@48v bank.

    3500ah x 15% charging rate = 525a x 55v charging ÷ .75 panel derate = ~38.5 kw pv array.

    So based on these (really spitballed example numbers), that's 3 48v strings of 1200ah@2v batteries (72 total), maybe US$25,000.  6-8 charge controllers, $4,000, and ~125 solar panels and racking, maybe $40,000.  Total in this example of very roughly $70,000.   There are likely cheaper ways to do it.  Just putting a few numbers to a sort of conventional solution.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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  • icarus
    icarus Solar Expert Posts: 5,436 ✭✭✭✭
    #8
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    How high are you pumping?  From what source? Does it have to be 275 gpm every time it pumps or can it be lesser amounts for longer periods?  Do you have to use the pump you have? As Estragon suggest, you are looking at a VERY expensive system if your needs are as you describe.
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