A pure sine wave inverter, like the Livguard Smart Sine 1100i 900 VA, delivers smooth, grid-like power. Fans run quietly, lights stay steady, and sensitive electronics are protected. As compared to the 900 VA inverter price, the square wave inverter is a cheaper alternative. But it may produce rougher current, cause noise, and shorten the lifespan of electronics. That’s why most people prefer a pure sine wave inverter today.