This seminar is geared towards the off-grid and grid-tied back-up applications of the bi-directional battery inverter Sunny Island 5048U. Special emphasis is given to the understanding of the AC coupling and the flexibility of its implementation in the Sunny Island family. The course explores in detail the response of the inverter to a grid outage as well as to the operation of the unique features of battery management, load shedding, and generator management. Renewable energy professionals, off-grid hybrid systems designers and back-up systems installers will find this training very useful.