The Enphase AC Battery is simple to install, safe, very reliable, and provides the lowest lifetime energy cost for both new solar customers and retrofit customers. As an installer, you can design the right system size to meet the needs of the homeowner.Our AC Battery is the first residential energy storage system to receive the UL 9540 system certification — a safety standard requirement issued by UL, the global safety science organization. The AC Battery’s modular architecture means you’ll get a storage solution that’s exactly what you need: no more, no less, no wasted costs. The system is easy to expand on as your needs change, as your family grows or you add an electric vehicle. Plus, flexible configurations work for any garage.