6 Electrical Connection
SMA Solar Technology AG
Operating manual
SI44M-80H-13-BE-en-15
44
Cable requirements:
☐ Classification: CAT5e
☐ Maximum cable length: 30 m
Procedure:
1. Ensure that the communication interface SI-SYSCAN.BGx is installed in each master (see SI-SYSCAN-NR
documentation).
2. Remove the terminator from the
SysCanOut
pin connector on the master of the main cluster and plug it into the
SysCanIn pin connector.
3. Plug the yellow data cable into the
SysCanOut
pin connector on the main cluster master (see Section 6.6.4,
4. Plug the other end of the yellow data cable into the SysCanIn pin connector on the master of the extension cluster
1.
5. Connect the other extension clusters with each other as described in steps 3 and 4. Remove the terminators for
this.
6. Leave the terminator plugged into the unused
SysCanOut
pin connector. This terminates the communication bus.
6.5.8
Connecting the Battery Temperature Sensor
With lead-acid batteries, the battery management of the Sunny Island inverter must record the temperature of the
connected battery.
Battery temperature sensor in a cluster
Only the master measures the battery temperature in a cluster.
• Connect the battery temperature sensor only to the master.
Requirements:
☐ Cable length for BatVtgOut, DigIn, and BatTemp: less than 30 m
☐ If cable lengths of 30 m and more are required for BatVtgOut, DigIn, and BatTemp, suitable lightning protection
precautions must be taken.
☐ If the battery temperature sensor and the batteries are not installed with the inverter in the same building, suitable
lightning protection precautions must also be taken.
Procedure:
1.
NOTICE
Damage to the battery due to excessive charging voltage due to incorrectly measured
battery temperature
Due to incorrect battery temperature measurement, the battery inverter charges the battery with an incorrect
amount of charging voltage. Excessive charging voltage can damage the battery.
• Connect only the battery temperature sensor supplied.
• Attach the battery temperature sensor as described in the following step.