Safety; Appropriate Usage - SMA SUNNY STRING-MONITOR Technical Description

SMA Solar Technology AG
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Safety

2.1 Appropriate Usage
The Sunny String-Monitor is an accessory for the Sunny Central central inverter. The DC subdistributor
offers the possibility of connecting several strings in parallel. The Sunny String-Monitor monitors and
recognizes outages and thus prevents loss of power and output. The string fuses in the Sunny String-
Monitor disconnect defective strings which, for example, have been damaged due to a short-circuit
in the module or in the cabling of the PV array.
The Sunny String-Monitor allows monitoring of the integrated overvoltage protectors. The overvoltage
protectors protect the inverters from transient overvoltages.
A
Figure 1: Principle of a grid-tied PV plant
Position
A
B
C
D
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Technical Description
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SM A
Description
PV array
Sunny String-Monitor SSM
Sunny Central
Transformer
Public grid
C
SU NN
Y CE
NT RA
L 80 0C
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SMA
2 Safety
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SSM-TEN103132 9