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Sunny Island
Installation & Operating Instructions
2 System Description
2.1 Modularly Structured Power Supply Systems
The supply of small decentralized consumers which cannot be connected to a public
grid is of large relevance world-wide, particularly in developing and threshold coun-
tries. This is an almost ideal application for isolated "off grid" photovoltaic power sup-
ply systems. Experience with such systems in an output range of 2-10 kW has
shown that they should not only be very reliable, economical and robust, but above
all modularly structured and therefore easily expandable later on. Only a simply
structured and flexible system design for these PV power supply systems will enable
widespread application.
The central component of such a modular power supply system is the battery in-
®
verter Sunny Island
. Intelligent system management and control not only allow to
®
supply different consumers, but also to connect the SMA Sunny Boy
String Inverters
for supplementary grid feeding. The connection of small wind energy converters or
diesel generator sets will also be possible.
On the AC voltage side the battery inverter must take over the complex control of
voltage, reactive power and frequency as well as power management and uses the
battery as a buffer.
On the DC voltage side the battery inverter makes sure to provide a best possible
battery handling. To this end it ensures that the temperature-dependent and current-
dependent voltage limits are complied with, full charge cycles are run regularly and
the charging methods are adapted to the battery type and the specific ambient condi-
tions.
Using this system-compatible battery inverter lets you reduce planning, execution
and system costs for PV island supply considerably.
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BWRI33-12:EE
SMA Regelsysteme GmbH
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