SMA SSM16-11 - Manual (Page 14)

3 Product Description SMA Solar Technology AG
14 SSM16-24-IA-IEN105120 Installation Guide
3 Product Description
3.1 Sunny String‑Monitor SSM16-11 / SSM24-11
The Sunny String‑Monitor is a DC sub-distributor to which several strings can be connected in parallel.
The Sunny String-Monitor monitors the input current to the strings and detects malfunctions.
Figure 2: Structure of the Sunny String-Monitor
The string currents are monitored by the measuring board in the String Monitor Unit in the
Sunny String-Monitor. A Piggy-Back is integrated in the measuring board for data processing. The
data processing Piggy-Back manages the string currents and the parameterization of the measuring
board.
The string fuses in the Sunny String-Monitor protect the PV string modules from reverse currents.
3.2 String Current Monitoring
The string currents are monitored via the measuring board in the String Monitor Unit (SMU). The
String Monitor Unit measures the string currents and continuously calculates the average currents. The
SMU compares the string currents with the mean values. If a string current exceeds or falls short of the
mean value by the set tolerance value, the warning 380 "SMU" is displayed.
You can adjust the parameters for monitoring the string current on the Sunny Central 100/200/250/
350 inverters and the Sunny Central in the HE-11 series on the integrated Sunny Central Control data
logger or in the Sunny Data Control program on the PC. It is also possible to read mean values on
the Sunny Central Control and in the Sunny Data Control.
Position Designation
A Doors
B Switch cabinet lock