Connection Of Three Batteries - SMA SUNNY BOY STORAGE 3.8-US Instructions D'installation

6 Electrical Connection
Two new fuse holders with a 40 A cylindrical fuse link must be installed and connected with DC
terminal blocks. All terminals must be switched parallely.
The battery must be connected to the terminal blocks of the new fuse holder.
Figure 16 : Overview for connection of one battery with a charging/discharging current limit of 30 A

6.8.1.5 Connection of Three Batteries

To connect three batteries with a charging/discharging current limit of 10 A each, the parallel
connection of the DC terminals A and B must be removed. The installed standard fuse holders and
fuses can be used for the connection of a maximum of two batteries. To connect three batteries, two
external fuse holders are required that must be connected with the DC terminal block in the inverter.
Additionally required material (not included in the scope of delivery):
☐ Two fuse holders for cylindrical fuses (10x38 mm)
☐ Four cylindrical fuse link (15 A, 10x38 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 53).
☐ 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).
Procedure:
The two new fuse holders incl. fuses must be installed outside the inverter.
The wiring between the fuse holders A/B and DC terminal block must be changed: The wiring
between the fuse holders A/B and DC terminal block A must be removed.
52 SBSxx-US-10-IA-xx-12
A+ B+ C+ A− B− C−
+ +
−
40 A 40 A 40 A
_
+
BAT 30 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