A battery makes more sense when there is surplus energy that can be stored and significant consumption later. If you already use a large part of the energy generated as it is produced, the additional financial benefit may be smaller.
For a proper comparison, you need two scenarios for the same property: a solar system without a battery and a solar system with appropriately selected storage. Consider how much energy is actually shifted to other times, the losses, the additional cost, and the warranty terms.
A home with high evening consumption may make greater use of storage than a space that operates mainly at midday. Conversely, a large battery that is often left empty or barely used does not make good use of its cost.
If you also want backup power during an outage, assess it separately from the savings. Compatible equipment and suitable wiring are required. At Solar Home, the choice is based on your usage profile and the goal of the installation.