Deciding between Sinewave vs. Squarewave/Sinosidal Inverter/UPS

Deciding between Sinewave vs. Squarewave/Sinosidal 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? Alternating current (AC) power is used by the vast majority of home electrical appliances. On the other hand, a battery holds direct current (DC) electricity. An inverter’s primary function is to transform DC current into AC electricity.

However, an inverter/ups convert DC current to either square wave or sine wave AC current at the core of its circuits. The output of a sine wave inverter is remarkably similar to AC current. The sine wave output is purer than the square wave output, which is also the basis for the existence of 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. Sine-wave inverters specifically convert direct current (DC) from a battery into alternating current (AC).

What is a Squarewave 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 also need to be aware that if you use square-wave inverters, many domestic appliances will become hot. Square wave inverters are prohibited in some European nations for this reason.

The situation in India.

In India, the square wave Inverter, which is called Digital Inverter, is sold in the majority, especially in the Northern Part of India. For example, in Delhi, which is the capital of India, square wave inverters are still getting sold in majority in the inverter/UPS category. This is a very 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 this industry has been driven by people who are non-technical. The majority 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 rumor made the impression in the mind of people that sinewave inverter/UPS is not a good technology for Indian conditions. 

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


The situation in Africa.

Even if we go to Africa, even in a small town, they use Sinewave technology as they were exposed to Sinewave technology during the initial phases. So now they can’t accept Squarewave technology as they know the benefits of Sinewave technology. But India is in India because inverters were started way back in the 1990s, so the initial technology was Squarewave technology only. It was only in 2002 that the Sinewave-based technology Inverter was designed first time in India by Mr. Kunwer Sachdev, who is the founder of Su-Kam, which has been made a household brand by him. 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 traveled all 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 the reason TVs, Fridges, Tubelights, Fans, etc are not able to sustain and go bad.  He recommends not running TVs, computers, and any sensitive appliances on the square wave inverters to avoid damage.


How do we recognize the sinewave and squarewave 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 the quality of their power. A sine wave inverter/UPS can produce power that is of a higher quality and is more suitable for sensitive electronic equipment, while 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 and that can easily differentiate the technology. These square wave Inverter/UPS are sold for backup for computers, monitors, and printers.


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 are used to power things like refrigerators, ovens, computers, laptops, and other home appliances.

Overall Safety Level

Square wave inverters/UPS don’t work as well and are also dangerous to use with appliances. Sine inverters/UPS are used in a very safe way.

Noise Interference

When they are 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, the majority is coming from china, and 90 percent 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, which is, in fact, destroying the Computer.


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.

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