SMA SI 3.0-11 Quick Reference Guide V.3.0 - Manual (Page 28)

4 Battery Backup Systems With All-Pole Disconnection SMA Solar Technology AG
28 Ersatzstrom-IS-en-30 Installation - Quick Reference Guide
4.2.4 Connecting the Slaves
Figure 9: Connecting the slaves
Position Designation Description/information
A AC power cable Sunny Island: connection AC2 Gen/Grid terminals L, N
TT
, and PE
Automatic transfer switch:
Connect slave 1 to X3 terminals L2, N, and PE.
Connect slave 2 to X3, terminals L3, N, and PE.
Conductor cross-section: 10 mm² to 16 mm²
B Measuring cable for voltage
measurement
Sunny Island: connection ExtVtg terminals L and N
Automatic transfer switch:
Connect slave 1 to X4 terminals L2 and N.
Connect slave 2 to X4 terminals L3 and N.
Conductor cross-section: 1.5 mm² to 2.5 mm²
C DC+ cable Battery connection
Conductor cross-section: 50 mm² to 95 mm²
Cable diameter: 14 mm to 25 mm
D DC − cable
E Data cable for the internal
communication in the cluster
Sunny Island: ComSync In connection
With slave 1: connection of internal communication bus of master
With slave 2: connection of internal communication bus of slave 1