power inverter proteus simulation

i have made inverter circuit in proteus,have used cd4047 to generate 50hz square wave, i have used irfz44 mosfet. what are the transformer rating for proteus simulation, using a 12V battery, output should be 220 watts, i am confused how to set the step up transformer for proteus.

and if a want to make an inverter of 350 watts, which mosfet shoul i use and what are transformer rating.

i had also posted the inverter schematics.

guide me, your suggestions are valuable for me.
hello! I want to make an inverter with ic 4047 but couldn't found it in proteus 8.1, how can I use this IC? in which version did you get it?