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SMA PVO-N-20 User Manual

Page 34

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7  Electrical Connection

SMA Solar Technology AG

34

PVO-BOX-IA-en-10

Installation Manual

Connection of String Inverters with One Single Input

For a string inverter, 1 positive and 1 negative DC terminal is required on the SMA PV Offset Box.
Only in the operating modes "Continuous operation" or "Temporary operation" will both positive DC
outputs on the SMA PV Offset Box need to be assigned. If only 1 DC input is to be connected, the
second positive DC terminal on the SMA PV Offset Box must also be connected to PV+ on the inverter.
The following DC connection options are possible (as examples):

Figure 12: DC connection options for a string inverter

Connection Options

Option

Description

A

String inverter with DC input not assigned - operating mode "Night mode"

B

String inverter with all DC inputs assigned - operating mode "Night mode"

C

String inverter with all DC inputs assigned - operating mode "Continuous operation"
or "Temporary operation"