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2 Safety
Term
Grid disconnection
Grid disconnection with all-pole
disconnection
Grid disconnection without all-
pole disconnection
2 Safety
2.1
Intended Use
The Sunny Island is a battery inverter that controls the electrical energy balance in an off-grid system, in a system for
increased self-consumption or in a battery-backup system.
The product is for use in weather-protected outdoor areas and in indoor areas. The ambient conditions prescribed for
the product must be observed at all times.
The product must only be used as stationary equipment.
The product is not suitable for supplying life-sustaining medical devices. A power outage must not lead to personal
injury.
Device type SI4.4M-13 must not be used for single-phase single-cluster systems and not for three-phase multicluster
systems (see planning guidelines "Design of Off-Grid Systems with Sunny Island Devices").
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. The battery must be protected
against short circuits. The locally applicable standards and directives must be complied with.
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).
The DC terminal of the inverter is exclusively intended for the connection of a battery with external battery fuse. Only
DC loads or DC energy sources that are immune to electromagnetic interference must be used.
The grid configuration of the utility grid must be a TN or TT system. Cables with copper conductors must be used for
the installation.
Use SMA products only in accordance with the information provided in the enclosed documentation and with the
locally applicable laws, regulations, standards and directives. Any other application may cause personal injury or
property damage.
Alterations to the SMA products, e.g., changes or modifications, are only permitted with the express written permission
of SMA Solar Technology AG. Unauthorized alterations will void guarantee and warranty claims and in most cases
terminate the operating license. SMA Solar Technology AG shall not be held liable for any damage caused by such
changes.
6
SI44M-60H-80H-13-IS-de-12
Explanation
The functional group grid disconnection is part of the automatic transfer switch of
the battery-backup system and disconnects the battery-backup grid from the utility
grid in the event of grid failure.
In the event of grid failure, a tie switch disconnects all line conductors and the
neutral conductor from the utility grid.
In the event of grid failure, a tie switch disconnects all line conductors from the
utility grid. The neutral conductor remains permanently connected to the utility
grid.
SMA Solar Technology AG
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