SMA SSM8-21-BS - Manual (Page 11)

SMA Solar Technology AG 4 Product Description
Installation Manual SSMxx-21-IA-BS-JP-en-20 11
4 Product Description
4.1 Sunny String-Monitor
The Sunny String-Monitor is a PV array junction box to which several strings can be connected in parallel. The
Sunny String-Monitor monitors the input currents of the strings and detects failures, thus helping to minimize power and
yield losses.
The string currents are monitored by the measurement PCB String-Monitor Unit (SMU) located in the
Sunny String-Monitor.
The string fuses in the Sunny String-Monitor protect the PV modules of the strings from reverse currents.
Block Circuit Diagram of the Sunny String-Monitor SSM8-21-BS/SSM16-21-BS
Figure 3: Block circuit diagram of the Sunny String-Monitor SSM8-21-BS/SSM16-21-BS