Presently there are 3 types of  Home – UPS / Inverters available :

• Square Wave
• Modified Square Wave or Quasi Sine Wave
• Pure Sine Wave

Features :

• Square Wave
  Square Wave output has High Harmonic content, emits squeaky noise and causes over-heating of equipment and components. It is harmful to electronic gadgets, specially gadgets with transformers and high speed motors.
  
  
• Modified Square Wave or Quasi Sine Wave
  This is most commonly used now which is compatible, noiseless and economical. The output characteristics are much better than Square Wave Inverters and it protects common electronic gadgets used for domestic applications like High Speed Fans, LCD TVs, Grinder cum Mixer and Domestic Desktop Computers.
  
  
• Pure Sine Wave
  These are commonly known as UPS Systems which are normally used in offices and banks to run mainly computers, printers and sophisticated electronic office automation gadgets.
  Pure Sine Wave output power guarantees all sensitive loads will be correctly powered with no interference and ensures 100% protection of electronic equipments.