SMA SB 2800i Installation - Manual (Page 18)

Installation Installation Guide
16 SMA Regelsysteme GmbH SB2800i-11:SE0504
5.2 Electrical Installation
The following figure shows the complete cabling of a Sunny Boy
2800i:
Depending on the type of PV module used, it is reasonable to
connect only one String or to use two or three parallel Strings.
Thus, the module has three plus poles and three minus poles.
These poles are simply connected in parallel within the inverter.
In case only one String terminal is used, please
cover the four plug-in contacts not used with the
seals enclosed.