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No you cannot, as they are different types of sensors.
The temperature sensor that comes with the Multiplus II can only be used in either the MP temp sensor port, or in one of four the Cerbo GX temp sensor ports. It only measures ambient room temperature, so you cannot connect this sensor to the Smartshunt.
For accurately monitoring your battery using the Smartshunt, you will need to buy its specific BMV-712 Smart/BMV-702 Temperature Sensor separately. This needs to be connected to the POSITIVE terminal of your battery bank.
- Tip: If you have multiple batteries in a bank (such as in parallel) connect the sensor to the middle battery, as this usually the hottest battery.
You can read more about the installation and the sensor, as well as find purchase links to all of them here https://www.bluepower.pro/how-to-install-the-victron-smartshunt/#auxiliary-connection-for-temperature-monitoring
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The manual for the Victron MultiPlus II, specifically in Section 4.4.6 and Appendix A, states:
For temperature-compensated charging, the temperature sensor (supplied with the MultiPlus-II) can be connected. The sensor is isolated and must be fitted to the negative terminal of the battery.
This sensor cannot be tested using a multimeter with a 9V output. This is due to the sensor’s chipset being designed for a maximum of 5V, provided by the inverter through port #9 (temp sensor positive) and port#10 (temp sensor negative) when correctly connected.
Connecting this sensor to the battery’s positive terminal and using it with your BMV-712 or 702 will result in damage to the chip and inaccurate readings.
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