SMA America, LLC
Wiring the Sunny Boy
Installation Guide
SB20_25_30HFUS-eng-IUS113711
51
10. Strip the ends of the additional wires on the other
side to a length of
1
⁄
2
in. (12 mm).
11. Loosen the screws of the upper terminal of the fuses
(A) in a counterclockwise direction.
12. For each additional wire:
– Feed in the wire from above into the terminal of a fuse holder(A).
– Tighten the terminal screw clockwise.
13. Connect two of the additional wires to the terminals (D).
14. Connect the third additional wire to screw clamp (E):
– Completely open the screw terminal counterclockwise.
– Feed in the wire from below into the screw terminal.
– Tighten the screw clamp clockwise.
15. Connect two of the negative DC wires of the PV strings to the terminals (H).
16. Connect the third negative DC wire of the PV strings to screw terminal (F).
– Completely open the screw clamp counterclockwise.
– Feed in the wire from below into the screw terminal.
– Tighten the screw clamp clockwise.
17. Plug the equipment grounding conductor of the
PV plant into terminal (B).
18. If there is a grounding electrode conductor:
plug the grounding electrode conductor into
terminal (A).
☑ Verify that all connections are correctly wired and
properly clamped or torqued. Pull the cables in
order to make sure that they are sufficiently
fixed.The Sunny Boy is connected on the DC side
ready to ground the PV plant negatively.
iring
rmation see manual)
One and Two String Wiring
(for more strings and further information see manual)
e Grounding
Negative Grounding
Positive Grounding
ROUNDED
UNGROUNDED
OUNDED
GROUNDED
GROUNDED
UNGROUNDED
UNGROUNDED
OUNDED
GROUNDED
GROUNDED
minal
Terminal
=
~
Terminal
Terminal
=
~
cing -
Facing -
L1
N
L2
+
L1 L2
N
N
L1 L2
+
+
B
A
