Yes. GAF Energy solar roof systems are compatible with many energy storage offerings on the market. A licensed energy storage contractor can evaluate, recommend, and install an appropriate energy storage system for your home.
AC-coupled batteries like the Tesla Powerwall or Sonnen Eco are designed to be added to existing solar installations at any time. Other energy storage systems may require unique equipment for existing solar installations.
All options and features for energy storage are site dependent and unique to the particular energy storage system. Please verify with a licensed energy storage contractor in advance that the specifications are right for the installed solar components and the desired operation modes (backup, self-consumption, time-of-use load shifting, etc.).