SMA PVO-N-20 - Manual (Page 19)

SMA Solar Technology AG 6 Setting the Operating Mode and Output Voltage
Installation Manual PVO-BOX-IA-en-10 19
6 Setting the Operating Mode and Output Voltage
Setting Options for the Operating Mode
The SMA PV Offset Box has the following operating modes:
• Night operation: the SMA PV Offset Box emits voltage overnight and is inactive during the day.
• Continuous operation: the SMA PV Offset Box continuously applies a fixed voltage to the
PV modules. During the continuous operation of the SMA PV Offset Box, the inverter must not
be connected to the electricity grid. Afterwards, you must manually set the SMA PV Offset Box
to another operating mode and restart the inverter.
• Temporary operation: the SMA PV Offset Box runs continuously for 10 days at a fixed set
voltage and thereafter switches automatically to night mode. As long as the SMA PV Offset Box
is continuously applying voltage, the inverter must not be connected to the electricity grid.
There are two switch positions for the operating mode "Temporary operation":
"Temporary operation 1" and "Temporary operation 2". After switching between these
positions, the SMA PV Offset Box restarts temporary operation and runs for another 10 days in
continuous operation.
Setting Options for Output Voltage
The output voltage of the SMA PV Offset Box can be regulated in two ways, as follows:
• Fixed voltage setting: for fast regeneration of the PV modules, it is recommended to set the
largest permissible fixed voltage. The output voltage can be set to a fixed voltage of 400 V,
550 V, 700 V or 1,000 V. The setting of a fixed voltage is required for the operating modes
"Continuous operation" and "Temporary operation" and is optional for the operating mode
"Night mode".
• Automatic voltage regulation: this setting is only required for the operating mode "Night mode".
With automatic voltage regulation, the magnitude of the output voltage is based on the PV
voltage of the previous day. For the automatic voltage regulation, there are two switch positions.
If at the SMA PV Offset Box one terminal is assigned with PV+, select switch position "Automatic,
1 string". If two terminals are assigned with PV+, select switch position "Automatic, 2 strings".
Obtain approval from module manufacturer
Ask your module manufacturer which operating mode setting is recommended for your
PV plant.