Looks like the inside of an Australian's dock worker's mouth...
The original Tripp Lite was 400 watts - $550.00 Wave form, absolutely square.
The most perfect looking sine wave isn't worth snot, if it plays permanent possum.
The world of inverters a depicted by cheap inverter manufacturer's is a gold plated tribute to Herb Tarlek. They lie like a wet rug. I rob the heatsinks out of cheap inverters, even though they buzz and lights flash. I know their lifespan will be as long as a group of Libyans hoisting RPG's under a cloudless sky.