Step Down Transformers | Truth or Myth: Buying 1 High Wattage Transformer Saves Energy Than Buying 2 Lower Wattages

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You’ve sure heard about step down transformers in the context of electricity. You might not be familiar, though, of the structures and technicalities underlying how it works. At the least, you should be aware of its usage benefits.


In a fundamental scale, transformers are electrical devices that work by converting electricity from a certain voltage how transforerms workto a different voltage as necessary either by stepping up or down, in the same frequency.

Saving energy

Much have been said and written enumerating the different types of transformers with a variety of wattages. But in terms of the saving energy, ever wonder about the truth (or myth) that by using high wattage than low wattage transformers, you can actually save more energy?

Let’s try to analyse by taking this example. A beauty salon owns three transformers: one having 100W and two having 50W. Their electrical tool that is mostly used to finish dressing up the hair of every customer is the hair blower which consumes 20W of power. On a typical working day, hairdressers use hair blowers simultaneously to serve customers efficiently in regard to time.

Given below are two cases. Which do you think saves more energy?

  1. Plugging two hair blowers in each of the two 50W transformers; or
  2. Plugging four hair blowers in one 100W transformer

Note that using simple arithmetic, the result of power consumption is the same for both cases: 80W. But by considering the materials used inside the transformer, it is concluded that using higher wattage transformers can save more energy than lower wattage transformers. This rationale can be simplified by the principles of resistivity.


Resistance is the property of a material that hinders the electric current’s flow. It is calculated using the formula: R = pL/A, wherein resistance (R) of the wire is taken as the quotient of the product of the length (L) and resistivity or constant of a particular material (p) and the area of the material (A) which is the copper wire in the transformer.

Applying this formula theoretically, we can say that when the area or diameter of the copper wire is smaller, the value for resistance is bigger.

The opposite is true; by having a bigger diameter of the copper wire, resistance drops. And bigger gauge size or diameter of the copper wire is exactly what higher wattage transformers are composed of.

So there you have it! We busted  the myth! 😀

15 responses to “Step Down Transformers | Truth or Myth: Buying 1 High Wattage Transformer Saves Energy Than Buying 2 Lower Wattages”

  1. I need to buy a transformer for my electrolux refrigerator 28 cubic foot
    they say I need a step down form 220 volts to 110V
    but with controlled power to surge no more than 110V and not 115V
    pls email me availability and price

    • Ellein says:

      Hi Harry,

      Can you advice us the wattage rating of your refrigerator? In this way, we could recommend the right transformer. Thank you! 🙂

  2. MCM says:

    Do you have a 60kva transformer 3 phase 480v-220v 3p wye delta dry type? If you do, how much does a unit cost? Thank you.

    • Apple says:

      Hello MCM,
      We don’t have a ready stock of this item; only ready to order ones. Are you willing to wait? Thank you for choosing Meiji.

  3. rolan says:

    I need a 20kva step up transformer 3000 watts. if u have how much it cost thanks

  4. ghe says:


    Do you guys have a transformer for a 9W, 110 V, hair clipper (Wahl)? Do you have your products available in SM MOA? Tia! 🙂

  5. Cristina says:

    May I know what transformer to buy to be used for my 1500w microwave oven? Please give price as well.

    • John says:

      Hi Cristina,
      We suggest to use our ST-5000, rated at 5000 watts stepdown transformer. We always recommend higher rating of transformer (3x the wattage rating of your appliances). Please check your email for requested price quotation. For more details, you can call us at 448-7423; 414-4012; 727-5790; 413-6636.
      Thank You.

  6. Ed says:


    How much for a 3000va stepdown transformer?



  7. Rowel says:

    How much for a 3000va stepdown transformer?

    • John says:

      Hi Rowel,

      Thank you for inquiring with us. Please wait for formal quotation we’ll send it thru email.


  8. Shawn Sveda says:

    Sent kitchen aid mixer to the Philippines rated US 120VAC 575W. What model step down would be good to operate this mixer in the Philippines?

    The minimal wattage unit and one above the minimal.

    • John says:

      Hi Shawn,

      Our recommendation is triple the rating of your appliance, use atleast 1800watts or higher. With 120V Output.

      Thank you

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