Re: Tesla 3 Battery Thermistor Spec
OK. Do you think a second thermistor is just for backup or does it have a specific use? I did not notice exact locations when I removed the OEM BMS card. I do not see a thermistor on my replacement BMS card, so I assumed it was inside
My intention is to use one to disable charging in the event of low battery temperature, and I'd like to know the "B" values (ohms per degree). MY BMS comes calibrated for a 10K B3950. If the Tesla thermistor is indeed 10K at 25C, and 12.5K at 15C, perhaps this is sufficient to determine the slope?
Perhaps full project disclosure would help.
The OEM BMS boards were replaced with Stealth EV boards in preparation for use with the Electrodacus.com "SBMS0" model.
This BMS is generally used for off-grid homes, but my application is to upgrade the solar (800W) and energy storage (10 kWh)in my RV with minimal impact on current traveling equipment storage. Thus the Tesla batteries are mounted below the floor in a newly fabricated insulated enclosure where the original AGM batteries were. An aquarium heater/thermostat and pump will be used to keep the batteries above 5C.
The new BMS will disable charging should the temperature falls below, or overvoltage occurs. The new BMS will also display the temperature and can be adjusted once I know thermistor parameters.