6 Electrical Connection
SMA Solar Technology AG
Operating manual
SBSxx-10-BE-en-11
57
The battery must be connected to the terminal blocks
A+
and
A-
.
COM
DC-in
SPS
AC-out
D-IN
A
B
M1
X1
X2
M2
ANT.
FCC ID: SVF-KP20
IC: 9440A-KP20
+
_
+
_
A+ B+
A− B−
C+
C−
BAT 30 A
Figure 19: Overview for connection of one battery with a charging/discharging current limit of 30 A
6.8.2
Requirements for the DC Connection
Fusing the DC terminals:
Each DC terminal is designed for a maximum charging/discharging current of 10 A. The
conditional short-time current-carrying capacity of all inputs is 40 A. Batteries that have no short-
circuit current limitation or are designed for a limitation of the short-circuit current greater than 40 A
must be additionally fused. The additional fusing must be designed so that it limits possible short-
circuit currents to <40 A.
Cable requirements:
☐ Conductor cross-section: 2.5 mm² to 10 mm²
☐ Insulation stripping length: 12 mm
☐ The conductors must consist of copper.
☐ The conductors must be made of solid wire, stranded wire or fine stranded wire. When using
fine stranded wire, bootlace ferrules must be used.
☐ Maximum cable length: 10 m
6.8.3
Connecting the power cable of the battery
DANGER
Danger to life from electric shock due to live DC cables at the battery.
The DC cables connected to a battery may be live. Touching the DC conductors or the live
components leads to lethal electric shocks.
• Ensure that the inverter is disconnected from all voltage sources.
• Do not touch non-insulated cable ends.
Procedure:
1. Remove the adhesive tape from the enclosure opening for DC connection and, if other
enclosure openings are to be used, take the sealing plugs out of these enclosure openings.
