I want a solar system that can charge my battery a little(20% of the power) and supply the rest of the power to my house(80%) during the day. In the day if there is no power consumed , or less power consumed ,I wanted to send that difference power to the grid.

In the night ,I wanted to completely rely on my battery.

I wanted to know if there is any type of solar system that can suit my needs?

An important thing: If something goes wrong with the system or my solar system do not give enough output , can I rely on the electricity department to supply me normal electricity?

I apologise for the lengthy summary , I’m not very experienced with this.

Thanks a lot, in advance!