[Richard]

In the romex wire that leads to the current cooktop, you will see four wires. Black, Red, White and Green/Bare Copper.

In the exist setup, the power will be wired Black to Red, that is 220, White is ignored. Green/copper is ground. To get 120, you will wire Black to White for one burner, Red to White if a two burner, and ground to ground of course.

That circuit is not currently wired to an inverter circuit. It is possible to run a 120V cooktop off of an inverter, but you would need some wiring changes at the inverter breaker box and the main breaker box to achieve that.

If you must, the easiest way to do that would be to add a larger box and circuit to the inverter breaker box and pull a completely new wire to the induction top. However, if it’s a two burner top, you will not be able to run both burners at the same time due to the limitations of the inverter. I believe your inverter is 3200 watts. One induction burner circuit is 1800 watts. Two circuits would be 3600 and would trip the inverter.

Clear as mud?