SMA SI 3.0-11 Installation - Manual (Page 39)

SMA Solar Technology AG 7 Electrical Connection
Installation Manual SI30M-44M-60H-80H-IA-en-30 39
3. Plug the white data cable into the ComSmaIn pin connector on the Sunny Island (see Section 7.5.4 "Connecting
the Data Cable", page 54).
4. In a single-cluster system, plug the white data cable into the ComSmaIn pin connector on the master
(see Section 7.5.4 "Connecting the Data Cable", page 54).
5. In a multicluster system, connect the masters to each other:
• Remove the terminator from the ComSmaOut pin connector on the master of the main cluster.
• Plug the gray data cable into the ComSmaOut pin connector on the master of the main cluster.
• Plug the gray data cable into the pin connector ComSmaIn on the master of the extension cluster 1.
• Connect the other extension clusters with each other as described.
6. Leave the terminator plugged into the unused ComSmaOut pin connector. This closes the communication bus.
7.4.8 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.
Procedure:
• On the Sunny Island, connect both insulated conductors of the
sensor to the BatTmp terminal (see Section 7.5.6 "Connecting
BatVtgOut, DigIn, BatTMP, and BatCur", page 56). In this case,
the polarity is arbitrary.
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.
/05*$&
Damage to the battery due to excessive charging voltage
Due to incorrect temperature measurements, the Sunny Island charges the battery with an incorrect charging voltage.
• Connect only the battery temperature sensor supplied.
• Attach the battery temperature sensor in the centre of the battery, in the upper third of the battery cell.
☑ The battery temperature sensor measures the warmest point of
the battery bank.