SMA SUNNY BOY STORAGE 3.8-US Instructions D'installation page 52

6 Electrical Connection
The battery with a charging/discharging current limit of 20 A must be connected to the terminal
blocks of the fuse holder A/B.
Figure 13 : Overview for connection of one battery with a charging/discharging current limit of 20 A
6.8.1.4 Connection of a battery with a charging/discharging current
limit of 30 A
Each DC terminal is designed for a maximum charging/discharging current of 10 A. For the
connection of a battery with a charging/discharging current limit of 30 A, all DC terminals must be
switched in parallel.
The installed standard fuse holders and fuses cannot be used for the connection of a battery with a
charging/discharging current limit of 30 A. The DC terminals must be modified.
Additionally required material (not included in the scope of delivery):
☐ Two fuse holders for cylindrical fuses (14x51 mm)
☐ Two cylindrical fuse links (40 A, 14x51 mm, ≥ 600 V DC)
☐ DC conductors for connection between fuse holders and DC terminal block The requirements
in terms of DC conductors for connection between fuse holders and DC terminal block must be
met (see Section 6.8.2 "Requirements for the DC Connection", page 54).
☐ 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 documentation of fuse holders).
Procedure:
The wiring between the fuse holders A/B and DC terminal block and all fuse holders must be
removed.
52 SBSxx-US-10-IA-xx-14
A+ B+ C+ A− B− C−
A/B+ A/B−
C+ C−
25 A − 25 A −
_
+
BAT 20 A
SMA Solar Technology AG
DC-in COM AC-out SPS
_
+
X1 M1 X2 M2
ANT.
FCC ID: SVF-KP20
IC: 9440A-KP20
A B D-IN
Installation Manual