If you want to power your house independently from the grid, your house has to be independent from the grid.
Anything where you sell your excess power back to the grid is in tight cooperation with the grid operators.

Standard house wiring is not set up to accommodate back feeding the grid nor independently powering.
So you will need a changeover switch professionally fitted if you want an independent power source, or your solar panel installers will fit the appropriate equipment to back-feed the grid.
Anything else will likely involve deaths, fires, broken equipment, criminal prosecution, insurance invalidation and all that nasty stuff.