SMA SSM-U-1615 - Manual (Page 13)

4 Product Overview
4.1 SMA String-Monitor
The SMA String‑Monitor is a PV array junction box to which several strings can be connected in
parallel. The SMA String‑Monitor can be operated in large-scale PV power plants with central
inverters from SMA Solar Technology AG or other PV inverters.
The essential tasks performed by the SMA String-Monitor are:
• to bundle the input currents of the strings
• to measure the input currents of the strings and transfer these to the inverter
• to transmit information on the input currents of the strings
This enables failures to be recognized and power and yield losses to be minimized.
Principle of a grid-tie PV system with SMA String-Monitor
Figure 2: Principle of a grid-tie PV system with SMA String-Monitor
Position Designation
A PV array
B SMA String-Monitor
C Sunny Central
D Transformer
E Utility grid
4 Product Overview SMA Solar Technology AG
Operating Manual 13 SSMUXX15-BE-en-10