Many solar systems will not work in a power outage. Fire codes dictate that there can’t be electricity going back to the grid in an emergency. When you install a battery backup system, your solar continues working when the power goes out.
Ironically, most of your usage is in the evenings, when solar panels are not producing. A home battery enables you to store your electricity from the sun or other renewables for on-demand use. This allows you to offset much more of your electricity usage.
Store your power for later use. A home battery can not only reduce your utility bill, but also allow you to take your home off-grid. Store the renewable energy you harness from wind/solar to environment.