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SMA Solar Technology AG
3.5 Structure of the Sunny String-Monitor
Depending on the option chosen, the Sunny String-Monitor may have a DC circuit breaker and may
be equipped with a different number or string connections. For the selection of Sunny String-Monitor
options or fittings use the option code in the price list. It determines both the assembly and recognition
of the Sunny String-Monitor.
Terminals, for the connection of the RS485 communication and the +55 V
provided in the connection area. In addition, the connection area provides a contact for the data
cable shield.
String monitoring takes place via the measurement circuit board in the Sunny String-Monitor, where a
Piggy-Back for data processing (SMU8HV-DVPB) is integrated. The SMU8HV-DVPB assumes string
current management and the measurement board's parameter settings. Two bolt clamps are
integrated into the Sunny String-Monitor to connect the DC main cable to the inverter.
The DC circuit breaker offers the option of disconnecting the Sunny String-Monitor on the inverter side.
In the case of grounded PV arrays, the positive or the negative pole can be grounded at the inverter.
In this case, cylindrical bridges are used instead of fuses in the Sunny String-Monitor.
For protection from transient overvoltages caused by lightning strikes, overvoltage protectors are built
into the Sunny String-Monitor. A grounding terminal is provided for connection of the equipotential
bonding.
Depending on the selected fittings, the interior view of a Sunny String-Monitor can differ from the
depicted maximum assembly options.
A
B
C
A
R
Q
P
Figure 5: Main components inside
Position
A
Technical Description
D E
O
N
Description
Mounting brackets
DC
F
A
M
L
K
A
SSM-TEN103132
3 Packing list
power supply are
G
A
1
2
3 4 5 6
I
H
A
15
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