Thanks for your question - you’re exactly right.
Currently power from your solar system will first be used in your home, and then any excess exported to the grid.
When your battery is installed, your solar generation will first be used in your home, then to charge your battery, and only once your battery is full, exported to the grid.
Under normal operation, your battery will discharge into your home to meet your household demand.
During a virtual power plant event, AGL may discharge ...