SMA SI 4548-US - Manual (Page 26)

3 Safety SMA America, LLC
26 SI4548-6048-US-BE-en-20 Operating Manual
3 Safety
3.1 Intended Use
The Sunny Island is a bidirectional inverter (battery inverter and battery charger) for off-grid systems.
The Sunny Island supplies loads on the stand-alone grid side and charges the batteries with the
energy from grid-feeding units connected on the AC side.
The Sunny Island is suitable for use indoors and in weather-protected outdoor areas.
The Sunny Island is not suitable for supplying life-sustaining medical devices. A power outage must
not lead to personal injury.
AC sources (such as PV inverters) can be used in off-grid systems for energy supply. Too much power
from the AC sources in the stand-alone grid can lead to system failures. The maximum output power
of the AC sources must be observed in off-grid systems (see Section 22 "Technical Data", page 226).
The powers of the individual Sunny Island inverters are added to yield the total maximum power.
The Sunny Island uses batteries for the storage of energy. The nominal voltage of the battery must
correspond to the input voltage on the DC connection. 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). If connecting a lithium-ion
battery, the following must be observed:
• The lithium-ion battery must comply with the locally applicable standards and directives and be
intrinsically safe.
• Ensure that the lithium-ion batteries are approved for use with the Sunny Island. The list of
lithium-ion batteries approved by SMA for the Sunny Island is updated regularly (see the
Technical Information "List of Approved Lithium-Ion Batteries" at www.SMA-America.com).
• If no lithium-ion batteries approved for the Sunny Island can be used, use lead-acid batteries.
• The lithium-ion batteries must be able to supply enough current at maximum output power of the
Sunny Island (see Section 22 "Technical Data", page 226).
In off-grid systems or battery-backup systems with lead-acid batteries only, a maximum of four
Sunny Island Charger charge controllers can be connected per cluster. In off-grid systems or
battery-backup systems with lithium-ion batteries, only charge controllers approved by the
manufacturer of the lithium-ion batteries must be used. A battery current sensor must be installed in
off-grid systems or battery-backup systems with lithium-ion batteries and external charge controllers.
The Sunny Island is not suitable for establishing a DC distribution grid.
The battery management must record the DC current when charging and discharging the battery.
The Sunny Island can control various devices in the system (e.g. load-shedding contactors) via two
multifunction relays. The multifunction relays are not suitable for controlling functions which may
endanger persons in the event of a malfunction of the multifunction relays, e.g. if there is insufficient
redundancy in the ventilation of the battery room.
Use this product only in accordance with the information provided in the enclosed documentation and
with the locally applicable standards and directives. Any other application may cause personal injury
or property damage.