SMA SI 5048, Technical Description

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SMA Solar Technology AG The Sunny Island 5048
Technical Description SI5048-TEN093630 13
2 The Sunny Island 5048
2.1 Properties
The Sunny Island 5048 is a bi-directional battery inverter (battery inverter and charger) for off-grid
systems. The Sunny Island supplies loads on the stand-alone grid side and charges battery banks 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 a low open-circuit and standby consumption. Due to the high overload
capabilities and the integrated output management, there is no need to oversize the Sunny Island.
The parallel operation of up to 4 devices on a single phase of a battery or of three devices on a
three-phase system enables the Sunny Island to be used to set up stand-alone power supply systems
with outputs of 3 to 26 kW. In doing this it is capable, with the aid of its sophisticated generator
management, of controlling a diesel generator connected to it in a particularly sparing and fuel-saving
manner. It can also be integrated into the public grid. The Sunny Island can also deactivate loads
automatically if the battery does not provide sufficient electrical energy.
The stand-alone grid's critical component, the battery, is monitored diligently and utilized optimally.
The intelligent battery management precisely records the battery's charge level. 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. Because of
these functions the battery service life can be largely 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
makes any service work easier.
The Sunny Island monitors the set voltage and frequency limits on the grid and generator. If these limits
are not observed, it disconnects from the external source without interruption and changes to
stand-alone grid operation. The Sunny Island also has an integrated anti-islanding process in order to
prevent unintended islanding on the public grid. If this process is triggered, the system also completely
switches into stand-alone mode without interruption.
The Sunny Island can be integrated into different system constellations. The following graphics show
the components of a Sunny Island System and the different wirings (single-phase, single-phase
parallel and three-phase).
Saving Data and Events
Always use the SD card to save data and events. In case of a failure SMA
Solar Technology can thus quickly help you.