6 Electrical Connection
SMA Solar Technology AG
Operating manual
SBSxx-10-BE-en-11
47
6.5
Connecting the Data Cable of the Battery and
Communication Cable of the Automatic Transfer
Switch
Connect the communication cable of each battery and, in battery-backup systems, the
communication cable of the automatic transfer switch as described in the following.
Communication between Inverter and Battery
• Communication between the inverter and the battery takes place via the battery
communication cable via CAN bus.
Additionally required material (not included in the scope of delivery):
☐ One battery communication cable for the communication between inverter and battery
☐ In battery-backup systems with automatic transfer switch: one communication cable between
inverter and automatic transfer switch
Requirements for data cable of battery:
☐ Twisted pair conductors
☐ Cable category: minimum CAT5e
☐ Shielding: yes
☐ Conductor cross-section: 0.25 mm² to 0.34 mm²
☐ Recommended number of conductor pairs: 4
☐ External diameter: 6 mm to 8.5 mm
☐ Maximum cable length between battery and inverter and, in battery-backup systems, between
automatic transfer switch and inverter: 10 m
☐ The cable has to be insulated for 600 V.
☐ UV-resistant for outdoor use.
☐ Comply with the requirements of the battery manufacturer.
Assignment of the terminal block:
Terminal block
Position
Assignment
A
B
C
D
E
F
A
Not assigned
B
Enable
C
GND
D
CAN L
E
CAN H
F
+12V supply for automatic
transfer switching device
