Requirements For The Dc Connection - SMA SUNNY BOY STORAGE 3.8-US Instructions D'installation

SMA Solar Technology AG
The outputs of the new fuse holders must be connected with DC terminal block A in the inverter.
The 25 A cylindrical fuse links of the fuse holders A/B must be replaced with 15 A cylindrical fuse
links.
Two batteries must be connected to the fuse holders A/B and C inside the inverter. One battery
must be connected to the new fuse holders outside the inverter.
+
15 A 15 A
_
+
BAT 10 A
Figure 17 : Overview for connection of three batteries with a charging/discharging current limit of 10 A each
6.8.2

Requirements for the DC Connection

Fusing the DC terminals:
The DC terminals A and B are connected in parallel as standard. The DC terminal A/B is secured
by a 25 A fuse (10x38 mm, 1000 V DC). The DC terminal C is secured by a 15 A fuse
(10x38 mm, 1000 V DC). The fuses protect the inverter and battery against short-circuit currents.
The fuses must only be replaced by fuses of the same type. If all three terminals are switched in
parallel, a 40 A fuse must be used. For this purpose, the DC connection area must be modified.
Additionally required material (not included in the scope of delivery):
☐ Conduits (trade size: 21 mm (0.75 in) or smaller with suitable reducer bush)
☐ UL-listed raintight or liquidtight conduit fittings (trade size: 21 mm (0.75 in) or smaller with
suitable reducer bush)
Installation Manual
A+ B+ C+ A−
A/B+ A/B−
− C+
15 A 15 A 15 A 15 A
_
+
BAT 10 A
B− C−
C−
DC-in COM
_
+
BAT 10 A
SBSxx-US-10-IA-xx-12
6 Electrical Connection
AC-out SPS
_
+
M1 M2
X1 X2
ANT.
FCC ID: SVF-KP20
IC: 9440A-KP20
A B
D-IN
53