50 Comments


  1. I didn’t realize that three phase power configurations on well pumps uses overlapping waves to provide constant power. My sister is having a home built for her family in the hills. Hopefully, she can use this info to choose a set up that can supply her family with constant water. Thanks!

    Reply
    • Victor Joseph

      Hi,

      I have a 3hp pump and also have taken 3 phase power connection. Is it efficient to go for 1 phase pump or 3 phase pump ?

      Reply
      • Brian McWhorter

        Victor,

        It sounds like you are saying that the pump requires a three HP motor. If you have three phase power available, I would recommend using it over single phase power for the motor as long as it is not significantly more difficult to install.

        Good luck!

        Reply
        • Ganesh mitkari

          Can single phase submersible pump runi continuslly a full day

          Reply

  2. One of the water pumps in the city broke a week ago and it got me curious about them! I didn’t know there were different power phases for pumps before. That is really cool that the most common power phases are single and three-phase! Thank you for all the information!

    Reply
  3. Miguel

    Hi We have single phase power available but we want to use a 3 phase in the pump. Is this possible. What is the life span of a 240 vs a 3 phase pump?
    Thank you

    Reply
    • Brian McWhorter

      Miguel,

      Thank you for your question. It is not possible to operate a three phase motor on single phase power without a piece of equipment called a phase converter. Digital phase converters are commonly added to variable frequency drives (VFD), and can be purchased from most motor shops or local electrical contractors. Keep in mind that if you are using a variable frequency drive, you need to either purchase a motor with a shaft grounding ring, or install a shaft grounding ring on your existing motor to insulate the bearings from stray voltage.

      Here are a couple of sites to check our for more information.

      https://wiki.openelectrical.org/index.php?title=Phase_Converter
      http://www.est-aegis.com/datasheets/AEGIS_HVAC_White_Paper.pdf

      Let me know if you have any other questions.

      Reply
  4. Najam Jamal

    Hi,

    I have a scenario in which I have a single phase connection available.

    I need to use a centrifugal pump of 5 hp which will pull water and throw to a stream of 600 ft.

    My queries are

    1. Does single phase hold the load of 5 HP.

    2. If yes will 5 HP pump be good enough to cover the 600 ft distance.

    3. What can be the atlternative with a limitation of having a single phase connection only? Can a phase converter helpful in this scenario in order to make it three phase and use a 3 phase pump?

    Appreciate a swift response.

    Thanks & Regards,

    Najam Jamal

    Reply
    • Angel

      I received a chart on how to obtain a meter. I don’t which one one should i go for. Is it single phase or three phase meter. Presently, i have a 0.5 horse power pumping machine using to pump water. Hopefully, to join this with AC, water heater and electric cooker. I don’t know whether single phase meter can take care of all aforementioned items.

      Reply
  5. Hussain

    Very helpful information. I learned a lot from your article.
    Thanks

    Reply

  6. What 3 phase cable size do I need to run two 5.5 KW 3 phase water pumps running in tandem at a distance of 450yards from power supply. The supply is 240v.
    Many thanks

    Reply
    • Brian McWhorter

      Neil,

      Thank you for your question. To be able to size cable, you would also need to know the following information.
      -Amp draw of your motor.
      -Maximum ambient temperature.
      -Allowable voltage drop (usually either 3%-5% of the source voltage).

      If you are powering both motors from a single power source/cable, you would need to rate the cable for both amp draws, or double the cable size requirements of a single motor.

      Hopefully this helps.

      Reply
  7. Jeff M.

    I want to install a 3 phase (208v) standby generator at my residence. The grid is a delta configuration or stinger leg. The only 3 phase equipment is a submersible well pump. Does the standby generator need to produce power with one leg as a stinger?

    Reply
    • Brian McWhorter

      Jeff,

      Thank you for your question. If the motor on your submersible pump is 3 phase, you will need to use the high-leg of your generator to operate it.

      Here is a helpful article that may explain things more completely.

      https://en.wikipedia.org/wiki/High-leg_delta

      Hopefully this helps.

      Reply
  8. rk

    I would like to know single phase and three phase submersible pump advantage.
    If I use three phase motor, my power cost comes down? or single phase pump will consume higher current?

    Reply
    • Janak Mathukiya

      I want to run single phase motor pump which is 5 HP and it draws 30 amps and it is 4000 feet away from my farm , I want to run it from my farm so how do I choose the cable size to supply 30 amps to motor

      Reply
      • Brian McWhorter

        Janak,

        Thank you for your question. I would recommend reaching out to a local wire/cable provider to see what they would recommend based on what they stock. There is a little more to take into account than what you have provided. I would recommend Cerrowire as a good online vendor.

        https://www.cerrowire.com/

        They will need the following information to size the proper cable.

        Length of cable run
        Phase of power
        Construction of conductor (Copper or Aluminum)
        Type of Installation (buried, conduit, overhead)
        Voltage
        Voltage drop (3% recommended)
        Current at the end of run (motor voltage plus safety factor)
        Number of parallels (they can help you with this portion)

        I hope this helps!

        Reply
  9. Manu Mark

    While using a 3 phase 5HP submersible agricultural pumpset, at times 2 phase is provided. An autostarter switch is used, which means the pumpset may run on the 2 phases and burnout.
    Please name and describe a tool to prevent 2 phase run and burnout.
    Can a protector be installed within the motor to stop it when 2 phases alone are provided?

    Reply
    • Brian McWhorter

      Mark,

      I would recommend contacting your power provider and see why the third leg of power is being lost. There are protectors you can purchase. I would recommend Googling a electrical control panel shop in your area. They should be able to provide a control to prevent the pump from engaging when you are having power issues.

      Reply
      • Basavaraj

        how can i use 3phase 3hp submersible motor pump if Only available 2Phase current is there any alteration

        Reply
  10. jun

    hi!
    I would like to ask if there is any way i can use vfd in my single phase water pump. my power source is 3 phase but the vfd available in our local store has single phase input and 3 phase output. how can i use this vfd in my single phase water pump?

    I will be appreciate your response. thanks

    Reply
    • Brian McWhorter

      Jun,

      Thank you for your question.

      There are a few options to convert three phase incoming power to a single phase output. There are drives available with these capabilities built in, but here is a quick summary of a few ways the conversion could take place.

      1. Convert the incoming three phase AC power to DC using an electronic rectifier, and then convert the DC power to single phase AC using a single phase inverter.
      2. Use a single phase transformer across two phases of the incoming power. This is only acceptable up to about 400 volts.
      3. Use a open delta transformer. Using this transformer effectively double the acceptable voltage rating as compared to a single phase transformer.

      I recommend talking to a local control shop for their recommendation. All of these options should be reviewed and implemented by an experienced electrician.

      Have a great day!

      Reply
  11. Prashant

    Three or single phase pump
    Which pump give more water having same HP

    Reply
    • Brian McWhorter

      Prashant,

      Please note that the phase is a characteristic of the motor and not the pump. At the same HP, the phase will have no effect on the performance of the pump.

      Have a great day!

      Reply
  12. Sandy

    How to identify the motor are of single phase or a three phase.if there is no name place on motor?
    Using multimeter…..?

    Reply
  13. bart collins

    Brian
    For my new home 15 years ago the well installer talked me into a VFD 3phase system instead of a single phase and traditional expansion tank. Since then, the well company has had to replace the franklin VFD unit 7 times due to failures, some months apart, some lasting a few years. I have spent nearly $8,000 in VFD replacement and service calls. There are multiple ground rods on the electric system and lightning/surge protection on both the VFD incoming line, line from well, and one on the power supply to the VFD. The failures always occur during a severe rain or lightning storm. The last controller cost me $3200, which is completely absurd. The well installer would not come out until I paid him up from for a controller that had failed 2 months earlier. Franklin has changed their warranty from 5 yrs to 3 years. I cant pay $3200 every 3 years for a failed controller.
    Do you have any suggestions on replacing the franklin with a cheap alternatve or should I remove the system and replace it with single phase equipment?

    Reply
    • Brian McWhorter

      Bart,

      I’m sorry, that sounds very frustrating. I’ll send you an email so we can discuss this a little further.

      Best regards,

      Brian McWhorter

      Reply
    • Kennith Purse

      Hi my borehole is 114 meters deep i have a Franklin 2Hp motor and a 27 stage wet end as you see there is a lot of weight so not easy to lift . The BEST protection i have found to date is SIMPLE the supply to my control box has a 15 A socket outlet and 15 A Plug top IF any lightning on the horizon i pull the plug out i have the normal under and over voltage protection as well. My pump has been down 28 years and no prob and runs about 5 to 6 hours a day,
      i have worked on HIGH voltage most of my life and this to me works and others around me have payed the price Good luck

      Reply
  14. Blair Calder

    Is there a line of Single Phase 220V water pumps ? I’m looking to replace a gas powered pump, but only have single phase 220V 50AMP power. Do you have a recommendation ?

    Reply
    • Brian McWhorter

      Blair,

      Thank you for your comment.

      If your flow and pressure requirements are low enough to keep the motor size below the 7.5 – 10 HP range, there are numerous options to choose from. Any pump manufacturer can supply a pump with a motor that will operate on single-phase 220-230V power. However, without knowing more about your application and current pump design, I cannot recommend anything specific.

      Best regards,

      Brian McWhorter

      Reply
      • Blair Calder

        Thank you so much for your prompt reply! The application is as follows :

        We have a 20,000 gallon tank that is 6 feet deep with a draw at the bottom. The pump is at the top of the tank. The input to the pump is 2″

        The pump needs to pump out 2″ diameter pipe 200 feet, then up 30 feet.

        I’m hoping to get 50 gal/min at 80+PSI at the end of the pipe.

        Thanks

        thanks

        Reply

  15. This article gives detail about pump configuration single vs three phase power This article gives suggestions on I enjoyed reading while going through this article and this is the best link for gaining all the information about it.

    Reply
  16. seth

    I work for an oil & gas operator in the water management dept. We are trying to run power to our water wells that we use to fill our frac pits. We use 40HP pumps in most of these wells, however one water well location the local power provider has told us they cannot provide 3 phase power to, but they can run single phase, if we do not run anything higher than 25HP off of it, with a phase converter and VFD, of course. I have been led to believe that we may can have a 25HP pump manufactured that would be able to produce the same flow rate as a 40HP. This all sounds great to me, but with my limited knowledge in the areas of electrical power and water well pumps, I felt it would be better to check with the professionals first. What are your thoughts/advice on this situation?

    Reply
    • Brian McWhorter

      Seth,

      Thank you for your questions. It sounds like you are asking two separate questions.

      – The size of the motor you can run off of the phase converter is based on the length of the power lines, voltage of those cables, and the available amperage. I would recommend reaching out to the panel manufacturer with this question.
      – If the pump required the larger motor to meet your original conditions, it will not work with the smaller motor. You will either have to find a smaller pump, or trim the impellers on the existing pump. Either way, you will have a significant reduction in performance.

      Good luck!

      Reply

  17. Great short article,

    I’m installing a solar well pump in a remote area, 1.1 kW with what I designed initially as a 2.4 kW PV system. The way I understand it, the single phase pump would require as much as 3 kVA to start which will probably be an issue.

    Would a 3-phase pump (same power) limit this starting requirement so that 2.4 kW from the solar panels would be sufficient? (inverter can switch 1P to 3P relatively easily).

    If yes, is 3-phase a general recommendation for solar pumps?

    thanks for any info on this subject.

    Reply

  18. I loved your blog and thanks for publishing this about pump configuration single vs three phase power!! I am really happy to come across this exceptionally well written content. Thanks for sharing and look for more in future!! Keep doing this inspirational work and share with us.Found an another website Apolloelectric.co.nz it has lots of valuable information for everyone.

    Reply
    • Brian McWhorter

      Thank you for taking the time to read it!

      Reply
    • Brian McWhorter

      Stephen,

      Yes, in essence you run a single-phase motor on a three-phase supply by only using one phase and neutral provided the voltage to neutral matches the motor rating. Make sure you ensure proper earthing and protection by MCB to the motor.

      You may want to have a local electrician make the actual connections.

      Good luck!

      Reply
  19. Reviewer

    very helpful blog – I have 200Amp, 120/240V, single phase power available. want to run 3-hp submersible sanitary pumps. Can get either 1ph or 3 ph pumps. for 3ph pumps would use VFD to convert to 3ph. would 1ph pumps be better or would 3ph pumps with VFDs be better?
    thanks

    Reply
    • Brian McWhorter

      Thank you for taking the time to read the article and for your question.

      If you only have single-phase power available and will only need 3 HP to meet your pump’s demands, you are better off to not try and convert to three-phase power. It would be cheaper and easier to stay with single-phase power for the pump and controller.

      As a tip, many submersible sewage pumps are not designed to run on a VFD. If you are going to use VFDs, make sure you confirm that the motors are inverter duty rated and that the conditions do not push the motor into the service factor. Service factors cannot be used when being operated through a VFD.

      Good luck!

      Reply
    • Manikandan

      I have single phase submersible motor and three phase supply can give three phase to single phase motor

      Reply
  20. Brijesh Vasoya

    HEllo ,

    we used gear pump of up to 15LPM in our machine .
    Every time customer dont have three phase power so they using it on single phase but some times its working and some time its not working . on which factor gear pump can purchase . if pump is free from start we have doubt on life of pump.
    plz note customer max using 50bar on pump.
    please suggest on it .

    Reply

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