Lol, you have me mistaken for someone who understands Greek. Seriously though, I too would be interested in learning more about how modified/square sine wave is different/why.
The advantages of the sine wave inverter are that the output waveform is good, the distortion is very low, the interference to the radio and communication equipment is small, and the noise is low. In addition, the sine wave inverter has complete protection functions and high overall efficiency.