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Top 5 Things To Know When Buying a Phase Converter


Everyday we get hundreds of calls with questions about phase converters. So, we thought we would take a moment and go over the top 5 things you should know before buying a phase converter.

As you can see, there are a few basic things you should know before buying a phase converter.

As a recap:

1. Make sure you have enough single phase power.

Here’s how to calculate how much single phase power you need:

Take the amount of three phase amps of your load x 1.6 = amount of single phase amps. Then, take the amount of single phase amps x 1.2 = required single phase amps with 20% adder. The 20% adder is factored in as a cushion simply because most towns and cities require you have 20% above what your load is.

2. Understand your load.

Is it light, medium, or heavy? To give you an idea, a light load would be something like a drill press or table saw. A medium load would machines similar to CNC machines. A heavy load would be things like HVAC, air compressors, and refrigeration.

3. The size of your load.

Know the horsepower, amps, and kilowatts. Knowing this will help you find the best phase converter for you. As a rule of thumb, you want to go 2:1 (2 times the size of your load) to find the size phase converter you need.

4. Indoor or Outdoor?

Make sure you buy a phase converter that will stay protected in the environment it will be in. For example, if you do welding you will want to make sure your converter stays protected from metal shavings. Likewise, if you are a woodworker, sawdust. If you are a farmer, you want to make sure your equipment is protected in wind, snow, and rain.

5. Who are you buying your phase converter from?

Make sure you are buying from someone who is reputable. We get calls all the time from people who previously bought a phase converter from someone who made one in their garage and it’s not working right and they have no service. By using a quality product to begin with, you will be able to get the exact amount of three phase power you need, protect your equipment, and be able to scale appropriately as needed.

19 thoughts on “Top 5 Things To Know When Buying a Phase Converter

  • Ahmad Sadoun

    July 5, 2016 at 12:05 pm

    I need rotary converter to my shop for 3 phase 380v ihave 15hp machinery thank you

    • admin

      July 13, 2016 at 1:50 am

      Thanks Ahmad, we will be in contact with you shortly!

  • Steve

    January 12, 2017 at 4:34 pm

    Hi. I want to spec out a converter for a kitchen application. Available system is 240V /1-PH. Appliance is a Hobart HCM450 Cutter Mixer. Rating is 5 HP. Customer doesn’t know yet if they can get the 230V model so it might be the 200V model. If they get the 200V model we will put in a buck-boost transformer, 240V to 208V, on the 1-PH input to the converter. Have to use NEC amperage since Hobart doesn’t seem to publish that, so either 230/3/15.2A or 200/3/17.5A. What do you recommend?

    • admin

      January 24, 2017 at 4:52 pm

      Hi Steve, Please give us a call at 888-743-6832 and we will be glad to get you what you need.

  • Bobby gray

    August 15, 2017 at 4:10 am

    I have a Hobart mixer grinder 4246 ,made to grind meat and stuff sausage with.has a 5hp.grinder motor and a 1 hp mixer motor.runs mixer motor when mixing and both grinding motor and mixer motor when grinding and stuffing,what is my best motor for my application?

    • admin

      September 14, 2017 at 11:29 pm

      Hi Bobby, Please give us a call at 262-402-6400 and we will help you get exactly what you need. Thanks!

  • Jim Dodd

    June 17, 2018 at 11:59 pm

    Can you do 440 3/phase,
    3 hp. Lathe?

  • amir

    June 27, 2018 at 11:29 pm

    i have a f1 sim with full motion hydraulics. what type of phase converter would i need rotary or static as i am completely new to this

  • K. Wayne

    September 12, 2018 at 2:07 am

    I need a Phase converter to convert a 1 hp 277 volts 3 phase to single phase 230 volts.

    • admin

      September 17, 2018 at 2:09 pm

      Hi K, Please give us a call at 1-888-743-6832 and we will be happy to get you exactly what you need!

  • Jesus Acosta

    April 6, 2019 at 1:55 am

    Can you use that converter to connect battery charger for fork lift?

    • Sarah

      June 4, 2020 at 5:51 pm

      You certainly can! Feel free to reach out to one of our sales associates at 888-743-6832 – they would be happy to look into and help you size for the proper unit!

  • Jack Davis

    October 6, 2019 at 1:10 pm

    Have three phase motors I would like to put into use.heavy lift, hoist, blowers, and more

    • Sarah

      May 28, 2020 at 2:50 pm

      Hi Jack! Feel free to give our sales team a call at 888-743-6832 and they will be happy to break down all of your equipment specs and see which size converter would work best for you!

  • Tom White

    December 8, 2019 at 7:09 pm

    I have 3 120 V 3 phase small motors total amps < 25 . Can you help me with what I need to convert my single phase to 3 phase.


    • Sarah

      May 28, 2020 at 2:04 pm

      Hi Tom, with those specs it sounds like they may be rated for single phase already? If you can, please send photos of the nameplates to and one of our sales associates will be happy to look into which converter set up would work best for you!

  • Ted Romine

    January 13, 2020 at 6:30 pm

  • Jose Espinosa

    January 21, 2020 at 12:19 am

    I just got a used compressor and it come with tree face motor,so I don’t have tree face electricity so I was thinking of replace the motor on the compressor but i don’t no what will be better to replace the motor or to get a converted to be able to used this compressor, please advise me what will be better for me, also I wish I could call you, but I’m a hard to hear person so if you don’t main text please,

    • Sarah

      May 26, 2020 at 5:55 pm

      Hi Jose! We would be happy to look into which option would be best for your set up. The converter is sized based off of the load directly so we will need some spec information off of the compressor itself. Feel free to text me directly at 262-402-6408 and I will be happy to help you further.

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