SMA SUNNY BOY 3.8-US - DC Connection; Requirements for the DC Connection

6 Electrical Connection
SMA Solar Technology AG
Installation ManualSBxx-1SP-US-41-IA-xx-1046
6.6 DC Connection
6.6.1 Requirements for the DC Connection
Connection options:
One string each can be connected to each DC input of the inverter during normal operation. The
DC inputs A and B can however be operated in parallel, and thus up to three strings can be
connected to inverters with two DC inputs and up to four strings to inverters with three DC inputs.
The following device types have two MPP trackers and therefore two DC inputs (A and B):
• SB3.0-1SP-US-41
• SB3.8-1SP-US-41
The following device types have three MPP trackers and therefore three DC inputs (A, B, and C):
• SB5.0-1SP-US-41
• SB6.0-1SP-US-41
• SB7.0-1SP-US-41
• SB7.7-1SP-US-41
COM DC-in
SPS
AC-out
D-IN
SPS
A B
M1
X1 X2
M2
ANT.
FCC ID: SVF-KP20
IC: 9440A-KP20
Max. 30V DC
DISPLAY
BAT MFR
USB
COM
DC-in
A+ B+ C+ A− B− C−
+
_
+
_
Sunny Boy 3.0-US / 3.8-US Sunny Boy 5.0-US / 6.0-US / 7.0-US / 7.7-US
COM DC-in
SPS
AC-out
D-IN
SPS
A B
M1
X1 X2
M2
ANT.
FCC ID: SVF-KP20
IC: 9440A-KP20
Max. 30V DC
DISPLAY
BAT MFR
USB
COM
DC-in
A+ B+ C+ A− B− C−
+
_
+
_
+
_
Figure 12 : Connection overview for normal operation
ENGLISH