More inverter reviews and teardowns than you ever know existed:
https://www.youtube.com/user/knurlgnar24/videos
One trick for reducing power use of motor and resistive loads is to get a 100V/50Hz inverter. For electronics, you want a 170V peak filtered square wave, which is easily obtained by hacking a cheap (but good quality) modified sine inverter to make the dead time very short, then adding series inductors to filter out EMI.