SMA Sunny Island 6.0H System Description page 16

3 Functions and Design SMA Solar Technology AG
The Grid-Connect-Box enables the connection of a multicluster system to utility grids and generators. Multicluster
systems with Grid-Connect-Box may not be connected to utility grids that require compliance with the European gird
connection conditions in accordance with Regulation (EU) 2016/631 establishing a network code (also known as
RfG).
If the utility grid only supports the generator function and no increased self-consumption is to be achieved, the
multicluster system with Grid-Connect-Box must be configured via the installation assistant for Island mode.
Multicluster-Box only with Utility Grid
PV SYSTEM
MULTICLUSTER-BOX
UTILITY GRID
LOAD
MAIN EXTENSION EXTENSION
CLUSTER CLUSTER 1 CLUSTER 3
Figure 4: Principle of a multicluster system with Multicluster-Box and utility grid
If the utility grid is directly connected to the Multicluster-Box, no generator is to be installed in the multicluster system.
When connecting the utility grid to the Multicluster-Box, the Multicluster-Box terminal provided for the generator must
be used (see operating manual of the Multicluster-Box). The installer bears sole responsibility for the grounding
configuration and the grid disconnection required for instances of grid failure. Grounding and grid disconnection must
be carried out in accordance with local standards and directives and approved by the grid operator.
If the utility grid is used as the only external energy source and directly connected to the Multicluster-Box as well, the
multicluster system must be configured via the installation assistant for Island mode
16 SI44M-80H-13-MC-IA-en-10 System Description