SMA SI 3.0-11 Quick Reference Guide V.3.0 - Manual (Page 36)

5 Battery Backup Systems Without All-Pole Disconnection SMA Solar Technology AG
36 Ersatzstrom-IS-en-30 Installation - Quick Reference Guide
5.2.3 Connecting the Master
Figure 15: Connecting the master
Position Designation Description/information
A AC power cable Sunny Island: connection AC2 Gen/Grid terminals L, N
TT
, and
PE
Automatic transfer switch: connection X3 terminals L1, 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: connection X4 terminals L1 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 Measuring cable of the battery
temperature sensor
Sunny Island: BatTmp connection
You only have to connect a battery temperature sensor if
lead-acid batteries are used. Mount the battery temperature
sensor in the middle of the battery connection, in the upper third
of the battery cell.