5 | Electrical installation
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Installation instructions sonnenBackup-Box
5.6.3 Connecting the battery cables
NOTICE
Mechanical or electrical overload of the branch terminals
Damage to components!
Position the two branch terminals in the control cabinet of the storage sys-
tem in such a way that they are not exposed to and also cannot cause any
mechanical or electrical overload.
X1
‒
+
1
2
1
1
4
5
2
3
X1
‒
+
4
5
2
3
X5.B
3
1
2
6
7
8
5
F1
(X1)
Backup-Box
T1
X4.B
4
Illustration 17: Connecting the battery cables on the storage system inverter
1
Terminal T1-X1 on the inverter
5 Plus line coming from F1
2 Plus and minus line from scope
of delivery
6 Minus line coming from F1 (or X1)
3 Branch terminal from scope of
delivery
7
Plus (positive) line - Backup-Box
4 Screw terminals of the branch
terminals
8 Minus (negative) line - Backup-Box
Remove both of the battery lines which are already connected (5 + 6) from terminal
strip T1-X1 on the battery inverter (1).
Remove the wire end ferrules on the two lines (5 + 6). To do so, pinch off the lines as
close as possible under the wire end ferrules.
If necessary:
Shorten the battery lines from the scope of delivery (2) and the lines com-
ing from the Backup-Box (7 + 8).
Strip each shortened line to a length of 20 mm.
Attach the supplied wire end ferrules to the shortened lines properly.
Connect the individual lines as shown in the illustration above.
Tighten the screws of the
terminal strip T1-X1
with a torque of
4 Nm
.
The branch terminals have two different terminals, each of which differs by the permissible
cable cross-section.
Tighten the both screws of each terminal with the following torques:
Terminal up to 25 mm²: 2.5 Nm
Terminal up to 35 mm²: 3.5 Nm
Finally, insulate the screw terminals of the branch terminals (4) with a suitable insulat-
ing tape.
