Connecting the Battery Temperature Sensor
Qualified person
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:
- Connect only the battery temperature sensor supplied.
- Attach the battery temperature sensor as described in the following step.
- Attach the battery temperature sensor in the center of the battery-storage system, in the upper third of the battery cell. As a result, the battery temperature sensor measures the temperature at the warmest point in the battery-storage system.
- Thread both insulated conductors of the sensor through a ferrite included in the scope of delivery and connect to the terminals BatTmp on the Sunny Island ( > Connecting BatVtgOut, DigIn, BatTMP and BatCur). In this case, the polarity is arbitrary.
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.
