What is the Difference Between Square Wave and Pure Sine Wave Inverters?

What is the Difference Between Square Wave and Pure Sine Wave Inverters?

“Do you want get a Sine Wave Inverter or Square Wave Inverter?”

Perhaps, this is one of the most common questions you’ll get when you try to purchase a power inverter. So what’s an inverter anyway? The majority of household electrical appliances use an Alternating Current (AC) electricity. On the other hand, a battery stores Direct Current (DC) electricity. The main purpose of an inverter is to convert the DC electricity into AC electricity.

But when it comes to the basis of its circuits, an inverter converts DC current to either Square wave AC current or Sine wave AC current. The Sine wave inverter output is very similar to the AC current. In comparison with the Square wave output, the Sine wave output is purer; that’s also the reason why the term Pure Sine wave inverter exists.

To give you an idea of how the two currents look like, refer to the photo below:

One more important thing that you need to know is many household devices get heated up if you’ll use Square wave inverters. This is the reason why Square wave inverters are banned in some European countries. Other than that, we outlined a comparison chart between Sine wave inverters and Square wave inverters below to help you differentiate them better.

Comparison Chart: Square Wave Inverter vs. Sine Wave Inverter

List of Features Square Wave Inverter Sine Wave Inverter
 

 

Supported Appliances

 

Square wave inverters are usually used to support motors alone.

Sine wave inverters are used to support household appliances such as refrigerators ovens, computers, laptops, etc.
 

Overall Safety Level

Square wave inverters are less reliable and also unsafe to use for appliances. Sine inverters are highly safe to use.
 

Noise Interference

Square wave inverters produce a very loud noise when used. Sine wave inverters produce normal sound only.
 

Cost

Square wave inverters are less expensive than Sine wave inverters. Sine wave inverters are more expensive than Square wave inverters.

Furthermore, there’s another type of inverter that you can take advantage of. This one is called “Modified Sine Wave Inverter.” This type of inverter is better than the Square wave inverter and more affordable than the Sine wave inverter. A Modified Sine Converter can be utilized for simple systems, however, there are heaps of equipment that it cannot support. Some of these are the following:

  • Medical equipment (e.g. oxygen concentrators).
  • Some laptop computers.
  • Home Automation Systems.
  • Anything that has Silicon-controlled Rectifier (SCR).
  • Laser Printers.
  • Photocopiers.
  • Appliances with microprocessor controls.

If you are planning to purchase a Modified Sine wave inverter, it is highly recommended to go for the Sine wave inverter instead. As modern technology continues to rise, the cost of pure sine wave inverters is dramatically decreasing, making them more affordable and accessible in the global market.

Are you needing of a UPS and an inverter to support your appliances? At PSS Distributors, we are offering high-quality equipment and installation services for our clients.

For sizing and costing, please visit our UPS calculator to see the best UPS for your personal needs at  http://www.pssdistributors.com.au/ups-calculator.

Why PSS Distributors?

To ensure you are choosing the right partnership for your next UPS project – you want a company that has proven themselves time and again and one who has previous experience with similar jobs, superior technical expertise and can offer the after sales support that you require.

So, Why PSS Distributors…

PSS Distributors has manufactured our own units since 1994, We have over 100 000 units in the market at present in 2 continents. Our technical expertise to design and manufacture the more difficult solutions has held us in good stead for 25 years.

A few of our more recognisable sites include:

  1. Toshiba CAT scans nation wide
  2. Avis Car Hire (2 x 60KVA)
  3. DHL (1 x 80KVA)
  4. BOC gases (1x 80KVA)
  5. Bunnings Warehouse (2000 x 600VA )
  6. NSW health
  7. Bosch
  8. Abbott Labs

We have designed and manufactured security power supply systems and have become the largest security power supply distributor in Australia, which include:

  1. Wall mount 4-24A in 12 and 24VDC
  2. Wall mount 4-25A in 24VAC
  3. Rack mount in DC and AC
  4. Battery backed up units

With over 40 years experience in power, innovative engineers, we have achieved what other UPS companies have turned away from, for example:

  1. Controlling a UPS to run on static switch to overcome large inrush currents and transferring back to inverter remotely when given the signal (CAT scans)
  2. Designing UPS with sleep mode to operate weeks after a power failure when needed (roller shutter doors)
  3. Manufacturing cost effective UPS systems with small inverters but large charges for very long battery back up (security cameras / telecommunications)
  4. Arranging UPS systems that convert single phase to 3 phase (lathes, power tools in workshops etc)
  5. Dedicated UPS systems to keep pumps on vaccine fridges running for hours.