SMA Solar Technology AG Sunny Island Electrical Connection
Technical Description SI2012_2224-TEN082311 65
Load shedding
The Sunny Island can automatically switch off loads to protect the batteries from deep discharge.
To do this, an external (AC or DC) power contactor must be installed between the Sunny Island and
the loads (see also chapter 19.3 "Accessories (Optional)" (Page 195)).
Generator Start
The Sunny Island can control generators. It supports generators that can be started and stopped by
a single contact and generators that require more than one contact (in combination with the
optionally available generator manager (GenMan)).
NOTICE!
If a relay is used for load shedding, the loads connected to the power contactor will no
longer be supplied with electricity in the event of a fault in the island grid system, even
when the grid is available.
Default Setting of the Relays
By default, relay 1 is set to the start generator function "AutoGn" and relay 2 is set to the
load shed function "AutoLodSoc".
The first figure in section 2 "System Overview" (Page 12) shows the principal connection.
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