SMA Off-Grid Systems - Manual (Page 13)

SMA Solar Technology AG 3 Information on Off-Grid Systems and System Description
Installation - Quick Reference Guide Off-Grid-IS-en-30 13
In a single-phase single-cluster system, up to three Sunny Island inverters are connected to one battery forming a cluster.
The Sunny Island inverters are connected on the AC side to the same line conductor. If the device types within the cluster
are different, the master must be an SI8.0H-11.
3.2.3 Single-Cluster System (Three-Phase)
Figure 3: Block circuit diagram
In a three-phase single-cluster system, three Sunny Island inverters are connected to one battery forming a cluster.
The Sunny Island inverters are connected on the AC side to three different line conductors. A cluster that consists of
different device types is only supported by SI6.0H-11 and SI8.0H-11. If the device types within the cluster are different,
the master must be an SI8.0H-11 (see Section 3.3 "Information on Off-Grid Systems", page 14).