Hello!
2 Smart Battery Sense are mounted on the same base and display different temperatures: one is 1°C too high, the other 4°C too low compared to a reference thermometer. The experiment was run for 4 hours to obtain stable readings. A deviation of -4°C exceeds the error specified in the technical specifications. Is there any way to adjust or calibrate temperature sensor in Battery Sense?
Hello @Alex221 ,
Unfortunately there’s no way to calibrate the temperature sensor in the Smart BatterySense. It’s supposed to be used as indication for the battery temperature and not as a true ambiant thermometer. As such its reading can deviate somewhat.
Btw which technical specifications are you referring to regarding this error?
Hello mkuiken**!**
Thanks for your reply.
Indeed, the Smart Battery Sense technical description doesn’t mention temperature measurement error. I read about such error in the SmartShunt description. However, both of these devices transmit battery voltage and temperature data to chargers to automatically adjust charging parameters. I mistakenly assumed that the battery temperature data transmitted by the Smart Battery Sense would be as accurate as that transmitted by the SmartShunt. Meanwhile, my two Smart Battery Sense units measure battery voltage good accurately (±0.01 V) relative to a reference voltmeter. After analyzing the above information, I have the following question: is it possible for a charger, such as the Blue Smart Charger IP22, to simultaneously receive voltage and temperature information from different sources via VE.Smart Networkin?
It’s usually good practice to only have 1 source for a certain type of information (voltage for example). That being said, the Ve.Smart Network is robust in that it will lock onto a single source in case it’s receiving the same information from multiple sources; other sources are then discarded.
So 2 SmartBatterySenses in the same network makes no sense (no pun intended) as the charger will lock on one of BatterySenses and not use the other BatterySense at all.
I can only think of 1 scenario in which you might want 2 devices sending out your battery voltage (Vsense) in the VE.Smart Network: when you have a SmartShunt and its aux input can’t be used by a temperature sensor because you’re using it for something else (midpoint voltage for example) but you still want Tsense in your network. In that case you can add a SmartBatterySense which will send out the Tsense in your network. The Vsense also send out by the SmartBatterySense is discarded because the Vsense from the SmartShunt is preferred and has higher priority.