Connecting External Sources
SMA Solar Technology AG
102
SI5048-TEN093630
Technical Description
14 Connecting External Sources
The Sunny Island supports the integration of external energy sources. Here a distinction is made
between the integration of a generator and the integration of the public grid.
Both the generator as well as the public grid are integrated through the AC2 connection of the
Sunny Island. A single-phase or a three-phase connection is possible. In the case of single-phase
parallel operation the transfer relays are operated in parallel, making it possible to use a
correspondingly larger current, which in turn allows for a generator or grid connections with a higher
capacity.
The Sunny Island has separate parameters for the grid and generator. This generally allows both
operating modes to be used without making additional adjustments. The parameter settings and
display values distinguish between settings or values which are generator-specific or grid-specific and
settings or values (EXT) common to both grid and generator.
14.1 Generator
The Sunny Island can start or stop a generator depending on consumer power or battery state of
charge. In this case, diverse limits and times are taken into consideration (see section
14.1.5 ”Automatic Generator Operation” (page 109)).
Expanded Generator Management System
If necessary, the Sunny Island and the generator can jointly supply loads; the sum of (nominal) power
of both energy sources is available via the stand-alone grid.
Connection in a single-phase parallel system
When installing parallel single-phase systems, the connection cables for AC1 and AC2 of
all Sunny Islands must have the same cable cross-sections and cable lengths.
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