Containerized energy storage systems refer to large-scale lithium energy storage systems installed in sturdy, portable containers. The sizes are usually 5 feet, 10 feet, 20 feet and 40 feet, mainly concentrated in 50Kwh to 10Mwh.  They are designed to store energy produced by renewable energy sources such as solar and wind to be used when needed.  Widely used in commercial and industrial energy storage as well as community energy storage.