SMA SUNNY BOY STORAGE 3.8-US Instructions D'installation page 48

6 Electrical Connection
Procedure:
The battery limited to a charging/discharging current of 20 A must be connected to the terminal
blocks of the fuse holder A/B.
The battery limited to a charging/discharging current of 10 A must be connected to the terminal
blocks of the fuse holder C.
Figure 12 : Overview for connection of two batteries with varying charging/discharging current limits
Connection of two batteries with a charging/discharging current limit of 10 A
each
The DC terminals A and B of the inverter are connected in parallel as standard. The parallely
connected DC terminal A/B limits the charging/discharging current to 20 A and the DC terminal C
to 10 A.
If you want to connect two batteries with a charging/discharging current limit of 10 A each,
proceed as follows: First, remove the parallel connection of the DC terminal A/B. Then replace the
25 A fuses of the fuse holder A/B with 15 A fuses. When the parallel connection has been
removed and the fuses replaced, the DC terminal A/B is able to limit the charging/discharging
current to 10 A.
Additionally required material (not included in the scope of delivery):
☐ One cylindrical fuse link (15 A, 10x38 mm, ≥ 600 V DC)
☐ DC conductor for connection to fuse holders The requirements in terms of the DC conductors
used for connection to the fuse holders must be met (see Section 6.8.2 "Requirements for the
DC Connection", page 53).
48 SBSxx-US-10-IA-xx-12
B+ C+ B− C−
A+ A−
A/B+ C+ A/B− C−
25 A 15 A 25 A 15 A
_
+
BAT 20 A BAT 10 A
DC-in COM AC-out
_
+
M1 M2
X1 X2
ANT.
FCC ID: SVF-KP20
IC: 9440A-KP20
A B D-IN
_
+
SMA Solar Technology AG
SPS
Installation Manual