SMA PVO-N-20 - Manual (Page 8)

2 Safety SMA Solar Technology AG
8 PVO-BOX-IA-en-10 Installation Manual
Figure 2: Principle of a PV plant with SMA PV Offset Box and multi-string inverter
No more than 1 SMA PV Offset Box must be connected per inverter. Exceptions to this rule are
inverters with several inputs in which the negative DC inputs are not internally bridged.
1 SMA PV Offset Box per string can be connected to this type of inverter.
The SMA PV Offset Box can only be operated with PV plants having an insulation resistance
(including insulation resistance of the inverter) of at least 200 kΩ.
The SMA PV Offset Box must only be operated with PV arrays (modules and cabling) of protection
class II.
Before installing the SMA PV Offset Box, ensure that the permitted operating range of each
component is maintained at all times.
You may only operate the SMA PV Offset Box once you have obtained the appropriate approval
from both the manufacturer of the PV modules and the manufacturer of the inverter. Note any relevant
restrictions in the approvals, e.g., pertaining to the maximum output voltage of the SMA PV Offset Box.
Any applications other than those described here shall be considered contrary to the appropriate
usage. Alternative uses or modifications to the SMA PV Offset Box will void the warranty claims and
operation permit.
Appropriate usage also includes compliance with all the supplied documentation. Keep this manual
in a convenient place for future reference.