I add a battery backup to my existing grid tie solar system which uses a SolarEdge inverter. It's becoming quite common that people purchase a grid tie system and then realize they want to add a battery backup. There are many ways to do it, but an AC coupled setup is going to be the easiest, cheapest, and most effective as well!
My Solaredge inverter: https://amzn.to/2TdZJKn
My Schneider backup inverter: https://amzn.to/2TgLynU
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Equipment I used for my system:
Panels: Qcell 305 watts.
Grid tie inverter: SolarEdge
Battery backup inverter: Schneider Conext 6648
Batteries: Interstate GC8
Scheider mini distribution panel
Schneider control panel
I have no affiliation with any of these companies, nor have I received any compensation from them. Use of SolarEdge logo on thumbnail falls under fair use of trademark, as it is a SolarEdge system that I am retrofitting.