SMA SIC 50 - Manual (Page 12)

Battery Management and Charge Control SMA Solar Technology AG
12 SIC50-IA-en-11 Installation Guide
4 Battery Management and Charge Control
4.1 SMA Operation
The SIC-PB communication interface must be installed and connected to the Sunny Island 5048/
2012/2224 for SMA operation. If a communication connection is established, the Sunny Island will
control of battery management, including charge control.
The charge controller receives the current and temperature-compensated nominal charging voltage
from the Sunny Island and transmits the battery's present charging current back to the Sunny Island.
This ensures that the battery is always optimally charged and that the Sunny Island calculates the
correct charging state. For further details on battery management see the Sunny Island
documentation.
If communication does not function in SMA operation, the battery will only be charged with voltages
of 13.5/27/54 V.
Working principle of a Sunny Island system with a charge controller
Battery
Charge controller
Sync bus (CAN)
Array
Sunny Boy
Sunny Island