The way I understand it. As long as there is sun shine the panels provide electricity to the home. You remain connected to your current provider for night time use.
There is a switching mechanism I have seen in homes which have generator back up systems. All the switching is done automatically.
If the panels provide more electricity than the home is demanding, the power co. must purchase the excess.
Feel free to correct me.
I understood baynative said he/she was already off grid.