We have several panels on our roof. The idea was never to save money - only to have backup power for some critical items if the power went out. Didn’t go overboard with capacity and never even thought about a subsidy.
Not sure how you can do that without cutting power from the grid totally. From all I have seen and read (and have installed on my house) and a friend who installs them in another state, if they are hooked to the grid to send back power when they produce more than you are using, they have to be able to be cut off in the event power coming from the electric company stops. Because otherwise linemen working to restore power are working with live power coming back at them.
What size battery system do you have with it?
You don’t need solar panels for that - you need batteries.
Solar or gas powered generators can be used to provide some charge on your batteries.