https://enphase.com/en-us/products-and-services/storage
With this setup, the battery modules are used to level your usage/generation profile. If grid power goes out, the battery modules will NOT power your home. The battery modules can also not be charged if the grid is down. The system is very robust, so you can install as much or as little capacity as you see fit.
https://www.solaredge.com/us/solutions/grid-backup#/
With this setup, the battery bank CAN power your home AND/OR be charged by the panels if grid power goes down. However, the inverter module is limited to 7.5 KW max power, 5KW on backup power, and 3KW battery charging rate.