I have just purchased a square wave UPS/Invertor and now I want to make a sine wave add-on for it at home.The unit is of 1000 Watt running on two 112 AH 12 V batteries (making 24 V in series)producing 260 Volts AC.
Could someone please send some schematics and guidelines to make one.I believe the last discussion on the subject took place quite a time ago and newer cheaper technologies must have appeared by now.
Also just to share, someone told me of a transformerless 1000W UPS.Can someone throw light on that.
I'll be grateful for the help
Azam