Just wondered how I would go about monitoring the internal temprature of my van living space ? I have a Cerbo gx and a 12/3000 there are a few sensor inputs but just want it to stand alone so if the temp drops I can go and put the heating on ?
Hello and good morning here in the forum. 
I didn’t quite understand the “stand alone” part, but the Cerbo has 4 temperature inputs that you can name independently and… if you want, you can also connect them and and then use it to switch something via the relays .
You could even use it to switch the heating on automatically in an emergency, or manually, just as you want.
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Victron sells the relevant temperature sensor for the Cerbo. Note that they may physically look the same but the Cerbo sensor is different from the BMV sensor. There are also wireless solutions.
Thank you so much do you have a part number that i can search for by chance please
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Could you please elaborate how to name them? I could not find where to rename them
If activated …
You can give them a “User difined name” in the Device list / Tempensor X / Device …
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Thank you!