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

6 Setting the Operating Mode and Output Voltage SMA Solar Technology AG
20 PVO-BOX-IA-en-10 Installation Manual
Requirements for Setting a Fixed Output Voltage
If you set a fixed output voltage on the SMA PV Offset Box, this must not exceed the maximum system
voltage of the PV modules, the inverter or other DC-side components.
General information on the maximum DC voltage of the PV modules and inverters can be found in the
respective product documentation. Please refer to the manufacturer approvals on the PV modules and
inverters for the specific requirements for operation with the SMA PV Offset Box.
The following applies to SMA inverters:
• For most SMA inverter types, the maximum voltage output to be set on the SMA PV Offset Box
is equal to the maximum DC voltage of the inverter.
• The inverters approved by SMA are listed in the datasheet of the SMA PV Offset Box at
www.SMA-Solar.com.
Permissible Combinations of Operating Mode and Output Voltage
Setting Faults
A setting fault is indicated by 3 red flashing LEDs. If the setting of the output voltage is not suitable for
the selected operating mode, the SMA PV Offset Box displays a setting fault during commissioning
(see Section 10 "Troubleshooting", page 45). A setting fault will also be displayed If you have
selected an unassigned switch position. As long as a setting fault is present, the SMA PV Offset Box
will not start operation.
Operating
mode Voltage
setting Explanation
Night mode fixed This setting is suitable for the overnight regeneration of
PV modules with severely reduced power. If you set the output
voltage on the SMA PV Offset Box to the maximum system
voltage, optimum regeneration will take place.
automatic,
1 string This setting is suitable for preventing power reductions in the
PV modules. Since regeneration takes place overnight, inverter
operation does not need to be interrupted. For automatic voltage
regulation, you will need to set the number of connected strings.
automatic,
2 strings
Continuous
operation fixed This operating mode is suitable for the rapid regeneration of
PV modules with severely reduced power. During continuous
operation the inverter must be disconnected from the grid.
Temporary
operation fixed This operating mode is suitable for the rapid regeneration of
PV modules with severely reduced power. The SMA PV Offset Box
runs continuously for 10 days at a fixed set voltage and then
switches to night mode with automatic voltage regulation. During
continuous operation the inverter must be disconnected from the
grid.