convert inverter to sine wave

Hi all,

Would like to have a DC to AC inverter, and was wondering if it would be easier to buy an modified sine wave inverter, in the 500-1000W range, and then convert/modify it to output a pure sine wave for home use? Or, would it be better to build a pure sine wave inverter from scratch, and if so, could anyone please direct me to any schematics or DIY's?

I've tried searching the web, but I must be doing something wrong, most of the inverter schematics I find are of the type modified sine waves or only manufacturer's of sine wave inverters.

Any help appreciated,

Thanks,
Ray

A pure sine-wave inverter is too complicated for you to make. Buy one.

I question the need for a pure sine output. The vast majority of household loads will operate fine with an approximate sinusoid and many will operate fine from a square wave. Also, a line isolation transformer will work well to smooth out a less than ideal waveshape. In fact, many purchased inverters provide output from a transformer fed with a square wave generated from switching FETs or BJTs on and off.

The peak voltage of a sine-wave is 1.414 times higher than its RMS voltage.
But the peak voltage of a square-wave that has the same power as a sine-wave is much lower. Its peak voltage is 0.707 times the peak voltage of a sine-wave.
So many electronic products that depend on the higher peak voltage WILL NOT WORK.
Power tools with an electronic speed control also will not work from a square-wave.

Square-waves are used for heaters and incandescent light (heaters).