A waveform represents how an AC (alternating current) differs as time progresses. The most common AC waveform is known as the sine wave. This wave is called a sine wave because the voltage series or current differs with the elapsed time's sine.
A pure sine wave is a steady, continuous wave that provides a smooth, periodic oscillation. Pure sine wave inverters are at the top of the list of functionality, with the ability to run any and all equipment designed to work on a pure sign wave.
In a pure sine wave, the AC power produced by the inverter closely matches the actual sine wave. In a modified sine wave, on the other hand, the polarity switches from positive to negative. The wave has a stair-step and square pattern wherein the polarity goes back and forth.
A pure sine wave inverter is an electronic device that converts direct current (DC) to alternating current (AC). It does this by converting the DC input into a pure sine wave output.
Because of this, pure sine wave inverters are always needed if you're going to be tied to the grid. Typically, you'll need pure sine wave inverters for sensitive equipment, newer TV's, CFL light bulbs, and appliances with AC motors (microwaves and refrigerators).
Pure sine wave inverters are good at two things: efficiently powering devices that use AC, and powering devices like radios that can suffer from interference. But, they can be expensive.
Sine Wave inverters won't have a problem running any of those appliances. However, one thing to be aware of with all inverters is that some appliances take a very high current when they start up - called the peak power. This is particularly true of motors which start under load, such as fridge or freezer compressors.
For example, a 100Ah lithium battery will power a 1000W inverter which is perfect for running laptops, televisions, blenders, power tools, and phone or camera chargers. A 1000W inverter is often the ideal size for most simple setups.
Sine wave inverters are more efficient than square wave inverters, when it comes to the conversion of DC to AC. This ensures that the power loss is minimised, due to greater efficiency. As a consequence, your electricity bill does not shoot up. This is an immediate benefit of using a sine wave inverter.
Inverter generators produce electricity in a 'pure sine wave' format – that is, in continuous smooth waves. Conventional generator technology delivers power in choppier square waves.
They are: True Sine Wave (TRUE SINE WAVE) Alternating Current. Modified Sine Wave (MODIFIED SINE WAVE) Alternating Current.
The major disadvantage of the modified sine wave inverter is that peak voltages usually varies with the voltage of the battery. Although it is cheap, without the regulation of the power supply, the modified sine wave inverter can cause electronic devices to behave erratically because of power surges.
Use an Oscilloscope and look for wave pattern if it gives sine or cosine waveform then the inverter is pure sine wave.
The main difference between a pure sine wave UPS system and a simulated sine wave UPS system is that a pure sine wave system in battery backup mode is guaranteed to produce a cleaner output for any piece of equipment connected to it, whether it's a desktop computer, lab equipment or a server in a data center.
2.0 advantages of sine Wave inverters
Inductive loads like microwaves and motors run faster, quieter and cooler. Reduces audible and electrical noise in fans, fluorescent lights, audio amplifiers, TV, fax and answering machines. Prevents crashes in computers, weird print outs and glitches in monitors.
A 2000W inverter will need 3 x 120Ah batteries.
For short: if You intend to power a 12V 1000W inverter, go for a 100Ah or a larger 12V lead-acid battery, or the overall energy efficiency of the battery/inverter system will be rather low.
For example, laptop computers, cellphone chargers, and all other equipment that uses a rectifier or AC/DC adapter to take an AC input and output DC to the device will typically work fine without a pure sine wave inverter.
Typically, a microwave can be powered by both pure sine wave and modified sine wave inverters. However, their performance may differ. Since a pure sine wave inverter's output is equivalent to utility power, you can expect a microwave to perform normally.
All AC appliances and equipment are designed to run off of a pure sine wave. Pure sine wave energy is the type of power that is produced by your local utility company.
If you're using a 12V 100Ah lead acid battery, you can expect the fridge to run for about 30-50 hours because lead acid batteries can only be discharged to 50%.
If you mostly want to run lights, TV, microwave oven, tools, etc, a Modified Sine Wave inverter is fine for your needs.