CascaESS is an Energy Storage System(ESS) is s specific type of power system that integrates a power grid connection with a hybrid inverter, BMS and battery system. It stores solar energy into your battery during the day, For use later on when the sun stops shinning.
It allows for time shifting power, charging from solar, providing grid support, and exporting power back to the grid.
When an cascaESS system is able to produce more power than it can use and store, It can sell the surplus to grid; and when it have insufficient energy or power,it automatically buys it from the grid.