Difference between sine wave inverter

Pure sine wave inverter: It produces a smooth, continuous waveform that closely resembles the AC power provided by the utility grid. The waveform is a true sine wave with a smooth and rounded shape. Modified sine wave inverter: It produces a waveform that is more like a stepped approximation of a sine wave.

In summary, pure sine wave inverters are generally considered to be more suitable for powering sensitive electronic devices and appliances, while modified sine wave inverters may be a more cost-effective option for basic power needs. When Do You Need a Pure Sine Wave Inverter?

The modified sine wave inverter realizes waveform control by controlling the conduction and cut-off time of switching elements such as thyristors and transistors. Pure sine wave inverter: It produces a smooth, continuous waveform that closely resembles the AC power provided by the utility grid.

If you chart it out, it looks like a sine wave at first, but if you look closely, there are jagged stair steps in the waveform as the inverter crudely flips between polarities rather than the smooth wave seen above. Devices designed to run from an AC power source will all generally run on a modified sine wave.

As you can see in this diagram, when you plot out AC and DC current polarity, AC power forms a smooth wave. This is known as an AC sinusoidal or "sine" wave. An inverter's job is to reproduce that wave from a DC power source, and there are two answers to this problem. A modified sine wave inverter produces an approximation of a real AC sine wave.

Devices without AC motors tend to work as expected with modified sine wave inverters, and any device with a rectifier cleans up that rough AC wave as it turns it into DC power. So lamps, TVs, and other devices are OK for modified inverter use. The major advantage of modified sine inverters is that they are less expensive than pure sine models.