Deciding between Sinewave vs. Square wave/Sinusoidal Inverter/UPS

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Deciding between Sinewave vs Square-wave/Sinosidal Inverter/UPS is the user’s choice, and here in this blog, we explain these waveforms in Inverter/UPS.

“Would you like to purchase a square wave inverter/UPS or a sine wave inverter/UPS?”

This may be one of the most frequent inquiries you encounter while trying to buy a power converter. So what exactly is an inverter/ups? Most home electrical appliances use alternating current (AC) power. On the other hand, a battery holds direct current (DC) electricity. An inverter’s primary function is to transform DC into AC electricity.

However, an inverter/ups convert DC to either square wave or sine wave AC at the core of its circuits. The output of a sine wave inverter is remarkably similar to AC. The sine wave output is purer than the square wave output, which is also the basis for the phrase “pure sine wave inverter/ups.”

What is a Sine wave inverter/UPS?

Sine wave inverters convert battery electricity into the same kind of power you receive from a standard wall outlet in your house or place of business. Sinewave inverters convert the direct current (DC) from a battery into an alternating current (AC).

What is a Square-wave Inverter/UPS?

One type of Inverter that converts solar DC power to AC power is the square wave Inverter. The square wave Inverter is more effective than the sine wave inverter and has a simpler architecture. However, because of the high harmonic content’s potential for interference, the square wave will not be suitable for all loads.

The unique situation with Square-wave inverters/UPS in Europe.

You must also be aware that many domestic appliances will become hot if you use square-wave inverters. Square wave inverters are prohibited in some European nations for this reason.

The situation in India.

In India, the square wave Inverter, called Digital Inverter or Quasi Sinewave Inverter, is sold in the majority, especially in the Northern Part of India. For example, in Delhi, India’s capital, square wave inverters are still getting sold in most of the inverter/UPS categories. This is a strange phenomenon as the service engineers and salespeople have spread the message in the industry that sinewave inverter/UPS can’t be repaired locally or the back feed current damages the sinewave inverter/UPS.

The real issue is that non-technical people have driven this industry. Most of them were local electricians who never had any formal education in the electrical and electronics major. From one person to another, this kind of rumour made the impression that a sinewave battery inverter/UPS is not a good technology for Indian conditions. 

The other factor is that most companies in the industry are also to be blamed for this misinformation. Most of them are still making square wave technology as their sinewave technology has more failures than the Square wave technology.

Major Challenge:The Square wave Inverters have the technichal challenge that in case they go bad the charging get uncontrolled and batteries are getting exploded and people are dying and lot of fires are happening for the reference im attaching news article.


The situation in Africa.

Even if we go to Africa, even in a small town, they use Sinewave technology as they were exposed to it during the initial phases. So now they can’t accept Square-wave technology as they know the benefits of Pure Sinewave Inverter/UPS technology. But India is in India because inverters were started in the 1990s, so the initial technology was Square-wave technology only. It was only in 2002 that the Sinewave-based technology Inverter was designed for the first time in India by Mr Kunwer Sachdev, the founder of Su-Kam, which has made a household brand. He is not with Su-Kam anymore. He is mentoring Su-vastika to become the next powerhouse in the power storage solution sector.


Kunwer Sachdev – The inverter man of India.

Kunwer Sachdev is the torch bearer of Sinewave-based inverter/UPS technology. He travelled across India and other countries to show the people the difference between square wave and sinewave technology. He explained that square wave inverter technology is why TVs, Fridges, Tubelights, Fans, etc., cannot sustain and go bad. He recommends not running TVs, computers, or sensitive appliances on the square wave inverters to avoid damage.


How do we recognize the sinewave and square-wave technology?


A sine wave inverter produces an output waveform that is a close approximation of a true sine wave, while a square wave Inverter produces an output waveform that is a square wave. The main difference between the two types of inverters is their power quality. A sine wave inverter/UPS can produce power that is of a higher quality and is more suitable for sensitive electronic equipment. In contrast, a square wave Inverter is less expensive and is better suited for powering motors and other types of load that are less sensitive to waveform distortion.

If we run the fans on the square wave inverter/UPS, there will be noise that can easily differentiate the technology. These square wave Inverter/UPS are sold for computers, monitors, and printers backup.


List of Features Square Wave Inverter/UPS Sine Wave Inverter/UPS


Supported Appliances


Most of the time, square wave inverters/UPS are used to power motors by themselves.

Sine wave inverters/UPS power refrigerators, ovens, computers, laptops, and other home appliances.

Overall Safety Level

Square wave inverters/UPS doesn’t work either and are dangerous to use with appliances. Sine inverters/UPS are used in a very safe way.

Noise Interference

When used, square wave inverters/UPS make a very loud noise. Sine wave inverters/UPS only make a regular sound.


Less money is spent on Square wave inverters/UPS than on Sine wave inverters. Square wave inverters cost less than Sine wave inverters/UPS.


If we go to the computer market to buy the UPS as a backup, most come from China, and 90 per cent are sold with Square Wave.

People don’t realize that even for the computer backup, they bring the UPS, which is supposed to protect the computer and is destroying it.


As a mentor of Su-vastika, Kunwer Sachdev has helped the company build a range of sinewave inverters that will revolutionize the power backup market in India.

6 replies
  1. Rodney
    Rodney says:

    Howdy! This is my first comment here so I just wanted to give a quick shout out and say I truly enjoy
    reading through your posts. Can you suggest any other blogs/websites/forums that
    deal with the same topics? Thanks!


Trackbacks & Pingbacks

  1. […] Modified sine wave or Square wave inverters: These inverters produce AC power that is not as smooth as pure sine wave power. This can cause some appliances and devices to operate less efficiently or not at all.… […]

  2. […] Better performance for sensitive electronics. Pure sine wave inverters produce a smooth, uninterrupted AC waveform ideal for sensitive electronics such as computers, TVs, and appliances. On the other hand, modified sine wave inverters produce a square wave waveform that can cause noise and interference with these devices.… […]

  3. […] Better performance for sensitive electronics. Pure sine wave inverters produce a smooth, uninterrupted AC waveform ideal for sensitive electronics such as computers, TVs, and appliances. On the other hand, modified sine wave inverters produce a square wave waveform that can cause noise and interference with these devices.… […]

  4. […] When the devices work faster, they do the job in less time and save energy. Therefore, if you want to receive improved performance and reduce electricity bills, we recommend you buy a pure sine wave inverter/UPS. […]

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