Mounting the Device
SMA America, LLC
28
SB20_25_30HFUS-eng-IUS113711
Installation Guide
4.6 Grounding the SMA DC-Disconnect
1. Lead the screw with locking washer facing teeth
down into the opening of the Sunny Boy and screw
into the thread of the SMA DC-Disconnect (turn the
screw clockwise).
☑ The SMA DC-Disconnect is connected to the
Sunny Boy via an electric conductive connection.
The Sunny Boy is grounded via the connection of the grounding cable to the DC side and
the AC side (see section 6 ”Wiring the Sunny Boy” (page 40)).
To ensure proper grounding of the SMA Disconnect, it must be connected with the
Sunny Boy via an electric conductive connection. This electric conductive connection has
to be provided by a screw and a locking washer included in the scope of delivery.
g Wiring
er information see manual)
One and Two String Wiring
(for more strings and further information see manual)
gative Grounding
Negative Grounding
Positive Grounding
Positive Grounding
UNGROUNDED
GROUNDED
GROUNDED
UNGROUNDED
GROUNDED
GROUNDED
Terminal
=
~
Terminal
=
~
Facing -
N
L1 L2
L1
N
L2
+
L1 L2
N
+
+
