Parallel Connection Of Strings; Maximum Number Of Connections Per Measurement Input - SMA SUNNY STRING-MONITOR Technical Description

2 Safety
Figure 2: Block circuit diagram of the Sunny String-Monitor in the PV system
2.2 Parallel Connection of Strings
2.2.1 Maximum Number of Connections per Measurement Input
Several PV strings can be connected in parallel in the Sunny String-Monitor. The maximum number of
PV strings connected in parallel depends on the adjustable tolerance, and can be determined as
follows:
N = maximum number of PV strings that can be connected in parallel.
The parameter "tolerance" can be adjusted in the Sunny Central Control.
Maximum Number of Strings
The maximum number of PV strings that can be connected in parallel is limited to 9, if the
tolerance is set to 10 %. If more than 9 PV strings are connected in parallel at this level
of tolerance, the failure of a PV string cannot be recognized.
• Adhere to the maximum number of PV strings which can be connected in parallel.
10 SSM-TEN103132
SMA Solar Technology AG
Technical Description