Connecting External Sources; Generator - SMA Sunny Island 2012 Technical Description

Connecting External Sources

13 Connecting External Sources
The Sunny Island supports the integration of external energy sources. A distinction is made between
the integration of a generator and the integration of the public grid.
Both the generator ans the public grid are integrated via the Sunny Island's AC2 connection. A
single-phase or a three-phase connection is possible. In the case of single-phase 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.
Connection in a Single-Phase Parallel System
When installing parallel1-phase systems, the connection cables for AC1 and AC2 of all
Sunny Islands must have the same cable cross-sections and cable lengths.
The Sunny Island has separate parameters for the grid and generators. It is therefore possible to use
both operating modes without 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 grids and generators.

13.1 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 chapter 13.1.5
"Automatic Generator Operation" (Page 137)).
130 SI2012_2224-TEN082311
SMA Solar Technology AG
Technical Description