System Overview
SMA
Solar Technology AG
12
SI2012_2224-TEN082311
Technical Description
2 System Overview
The Sunny Island is a bi-directional battery inverter (battery inverter and charger) for off-grid
systems. The Sunny Island supplies consumers on the stand-alone grid side and charges battery
banks with the energy from grid-feeding units connected on the AC side.
High efficiency
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 93 %. Optimized for partial load
operation, its low open-circuit and standby consumption are convincing features. Because of its high
overload capability and integrated power management, overdimensioning of the Sunny Island is
not necessary.
Multiple Phase / Parallel Connection Capabilities
The parallel operation of up to three 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 up to 9 kW.
Automatic Generator Control
Thanks to its sophisticated generator management it can control connected diesel generators in a
particularly gentle 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.
Perfected Battery Management
The stand-alone grid's critical component, the battery, is monitored diligently and utilized optimally.
The intelligent battery management registers the battery's state of charge precisely. This makes
possible an improved utilization of the battery capacity, which 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.
DC fuse
WARNING!
The Sunny Island 2012 / 2224 has no internal DC fuse.
Install an external DC fuse between the Sunny Island and the battery (see chapter 7.2
"DC connection" (Page 43)).
