Do you really need pure sine wave for your tv's or are you happy with your modified sine wave inverter. My 750 Tripp lite inverter took a dump and now need to replace it. BTW it was not pure sine wave...
To me, paying the price difference between a MSW and a PSW inverter is worth it. With a known good PSW inverter, even at load, the waveform will be a sine wave. With a MSW device, who knows what it might look like.
A PSW inverter's price difference is definitely cheaper than a new laptop or iPad.