SMA SUNNY ISLAND 6.0H - 2 Safety; Intended Use

2 Safety
SMA Solar Technology AG
System Description 7SI44M-80H-13-MC-IA-en-10
2 Safety
2.1 Intended Use
The multicluster system forms an AC grid and is made up of several three-phase clusters. Three SunnyIsland are
connected in parallel on the DC side of each cluster. The multicluster system can be set up as an off-grid system or as a
system with increased self-consumption and battery-backup function.
The Multicluster-Box and Grid-Connect-Box do not replace the distribution board for the loads or the PV system. In
addition to the Multicluster-Box and Grid-Connect-Box, you must install the necessary protective devices for the loads
and the PV system.
Loads connected to the SunnyIsland must have an CE, RCM or UL identification label.
The product is not suitable for supplying life-sustaining medical devices. A power outage must not lead to personal
injury.
Only device types with the same output power may be installed in a cluster. This means that the device types, such as
SI6.0H-12 and SI6.0H-13, may be combined within a cluster. In contrast, device types with different outputs (e.g.
SI6.0H-13 and SI8.0H-13) may not be combined. The cluster master must always be an SI6.0H-13 / SI8.0H-13. It
must be equipped with the latest firmware version.
An utility grid connected to the multicluster system must be a TN or TT grid configuration. The technical connection
requirements of the grid operator and the local standards and directives must be fulfilled. When connecting the
multicluster system to the utility grid, all information in this quick reference guide and the instructions provided in the
enclosed documentation must be observed.
Generators must be suitable for TN systems and must always be connected to the Multicluster-Box.
The entire battery voltage range must be completely within the permissible DC input voltage range of the SunnyIsland.
The maximum permissible DC input voltage of the SunnyIsland must not be exceeded. A battery fuse must be installed
between the battery and the SunnyIsland.
With lead-acid batteries, the battery room must be ventilated in accordance with the requirements of the battery
manufacturer and with the locally applicable standards and directives (see documentation of the battery
manufacturer).
The following conditions must be satisfied for lithium-ion batteries:
• The lithium-ion battery must comply with the locally applicable standards and directives and must be intrinsically
safe.
• The battery management of the lithium-ion battery used must be compatible with the SunnyIsland (see the
technical information at “List of Approved Batteries”).
• The lithium-ion battery must be able to supply enough current at maximum output power of the SunnyIsland (for
technical data see the SunnyIsland operating manual).
An DC supply grid may not be established with the SunnyIsland.
The AC sources in the multicluster system must be suitable for stand-alone mode with SunnyIsland (for PV inverters see
planning guidelines "Design of Off-Grid Systems with SunnyIsland Devices" at www.SMA-Solar.com). The maximum
output power of the AC sources in a stand-alone grid must be observed (see the operating manual of the
SunnyIsland).
For a multicluster system with increased self-consumption and battery-backup function, the connected PV system must
be suitable for both stand-alone mode and utility grid operation (see the planning guidelines
"SMAFlexibleStorageSystem with Battery Backup Function" at www.SMA-Solar.com). The maximum output power of
the PV system depends on the installation site (see Section3.4.3, page20).
DC charge controllers may not be included in a multicluster system connected to the utility grid.
With the internal measuring device of the Multicluster-Box, the multicluster system detects the electricity fed into and
purchased from the grid at the grid connection point of the Grid-Connect-Box. The internal measuring device of the
Multicluster-Box does not replace the energy meter of the electric utility company.