SMA SI 3324 Installation - Manual (Page 48)

Electrical Connection SMA Technologie AG
Page 48 SI3324/4248-14:SE2406 Installation Guide
5.4.3 Load shedding
The Sunny Island 3324/4248 can automatically switch off loads to protect the
batteries from deep discharge. To do this, an external power contactor, e.g. with a
230 V 16 A NO contact, must be installed between the Sunny Island 3324/4248
and the loads.
The external contactor is controlled by an internal relay (connection terminal
"Load_S"), which can be controlled using the "40-6 Load_Shedding" parameter. This
parameter is set to "OFF" at the factory. Please read section 8.6 "Automatic Load
Shedding Setting" (Page 80) for more information on this topic.
This wiring is shown in the following figure:
Installation of the load shedding system is strongly recommended in systems
with extensive AC-side coupling of solar power or wind power. This is the only
way to achieve safe operation of the system, even in cases of low energy
generation or very high consumption.
*)
N
Loads
AC-Output AC-Input
k1
K1
Sunny Island
N L
Load_S
Sunny Boy