question

Christian Lindermann avatar image
Christian Lindermann asked

Is it possible to install the temperature sensor on the negative pole?

Hi. Following case: I’m building a lithium battery with Thundersky cells. On the plus pole there will be the bms (ecs lipro).
For my BMV-712 I need to install the temperature sensor...so there are two points I’m not happy with.

First, the temperature sensor is quite big, so maybe I’m running out of space ;)

Second, because it is not an active balancer the bms turns power to heat, so I think the probe would not provide valid data.

So my question is, could it be a possibility to install the sensor on the negative pole and just use the black wire to the temperature input on the shut? Another wire would deliver the +12V to the shunt...

thank you for supporting me!

Yours, Christian

BMV Battery MonitorLithium BatteryTemperature Sensor
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3 Answers
Justin Cook avatar image
Justin Cook answered ·

Hi @Christian Lindermann, no, this is not possible with the BMV-702/-712 temperature sensor. That being said, why are you installing it at all if you don't believe the installation location will provide real temperature data? If it were me, I would only install a power supply wire (as provided in the BMV-712 kit) and then install a separate temperature sensor like the Smart BatterySense that physically attaches to the battery, thus providing real temperature data from the battery casing itself.

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Christian Lindermann avatar image
Christian Lindermann answered ·

Hi.

Thank you for your suggestions. Well what worries me is, that the measured temperature is more the temp from the BMS instead of the real (inner) battery temp. SmartBatterySense might be an option, but it would be an additional device...especially the BMV already offers the function already.

Is there also a technical background that does not work as proposed?

Another problem I found is that the sensor has only an M8 cable lug, I need a M12 to conect it to the Winston terminal.

Greetings

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klim8skeptic avatar image
klim8skeptic answered ·

Is there also a technical background that does not work as proposed?

The lug provides DC voltage for the temp sensing IC within the lug.

Another problem I found is that the sensor has only an M8 cable lug, I need a M12 to conect it to the Winston terminal.

I moved all my low power connections onto a short bus bar. I have not noticed my shunts getting warm.


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