2 Sunny Island 4548-US/6048-US
SMA America, LLC
16
SI4548_6048-US-TB_en-13
Technical description
2 Sunny Island 4548-US/6048-US
2.1 Properties
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 comfortable support of AC and DC coupling, as well as the expandability of the systems formed
with the Sunny Island guarantee highest flexibility. In addition, innovative technology allows the
Sunny Island to achieve a maximum efficiency of more than 95%. Optimized for partial load
operation, it impresses with low no-load operation and standby consumption. Due to the high
overload capacity and the integrated output management, there is no need to oversize the
Sunny Island.
The operation of up to three devices in a single-phase parallel system, of three devices in a
three-phase system or of up to four devices in a double split-phase system enables the Sunny Island
to establish off-grid power supply systems with a power of between 2 kW to 24 kW. In Multicluster
systems, powers of up to as much as 100 kW are possible. Thanks to its sophisticated generator
management, the Sunny Island can control connected diesel generators in a particularly low-stress
and fuel-saving manner. The utility grid can also be integrated. The Sunny Island can also deactivate
loads automatically if the battery does not provide sufficient electrical energy.
The critical component of the stand-alone grid, the battery, is monitored diligently and optimally
utilized. The intelligent battery management precisely records the state of charge of the battery. This
makes an improved utilization of the battery capacity possible, which also means that smaller and
thus more cost-effective batteries can be used without affecting performance.
In order to prevent premature aging caused by incorrect charging and frequent deep discharge, the
Sunny Island has an intelligent charge control and reliable deep discharge protection. Thanks to these
functions, the battery life can be greatly extended in comparison with simpler devices.
Despite its complex functioning, the Sunny Island is easy to configure. All the settings required for
operation can be quickly and easily programmed in a few steps using the "Quick Configuration
Guide". By employing the concept of central operation referred to as "Single Point of Operation", the
system/cluster parameters are only set on the master device, and all other devices automatically
adopt the configuration. The easy-to-understand menu navigation allows quick access to all important
data, even while the system is running. An SD card provides uncomplicated system control, and thus
facilitates any service work.
Saving data and events
Always use the SD card to save data and events. In case of a failure SMA can thus help you
quickly.
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