SMA PVO-N-20 User Manual
Page 35
SMA Solar Technology AG
7 Electrical Connection
Installation Manual
PVO-BOX-IA-en-10
35
Cable Connections
Connection of Inverters with Several Independent Inputs
For an inverter with 2 independent inputs and 1 internally bridged negative DC terminal, such as in
SMA multi-string inverters, 1 positive DC terminal per input and 1 negative DC terminal at one of the
two inputs are required. As a result, you will only need 1 SMA PV Offset Box for all the PV modules
connected to the inverter. Should the negative DC inputs of the inverter not be internally bridged
(see inverter documentation), the SMA PV Offset Box will only apply voltage to one string. In this case,
you must connect 1 SMA PV Offset Box per string.
For an inverter with more than 2 independent inputs, 1 positive DC terminal is required at each input
to which voltage is applied first in the morning and last at night. In addition, 1 negative DC terminal
is required at one of these inputs.
If an inverter has several independent inputs but only 1 input is assigned, just 1 positive and 1
negative DC terminal will be required at the assigned input.
Only in the operating modes "Continuous
operation" or "Temporary operation" do both positive DC outputs on the SMA PV Offset Box have to
be assigned. In the event that only 1 DC input is to be connected, the positive DC outputs of the
SMA PV Offset Box must be bridged with a Y plug.
Connection Description
SUNCLIX
1
PV+ connection cable SMA PV Offset Box to inverter or
Y distribution
2 x positive (+)
2
PV − connection cable SMA PV Offset Box to inverter or
Y distribution
2 x negative ( − )
3
PV+ connection cable PV array to inverter
1 x positive (+)
4
PV − connection cable PV array to inverter
1 x negative ( − )
5
PV+ connection cable Y distribution to inverter
1 x positive (+),
1 x negative ( − )
6
PV − connection cable Y distribution to inverter
1 x negative ( − ),
1 x positive (+)
7
PV+ Y distribution
2 x negative ( − ),
1 x positive (+)
8
PV − Y distribution
2 x positive (+),
1 x negative ( − )