Like the title states I have a cerbo gx with temperature input 4 wired up and turned on in the software in Battery Temperature mode.
Battery temperature shows on the cerbo display and the vrm portal etc but the mppt250/100 will keep charging below 5 deg.
It’s all hooked up with the ve.direct cables but I’m unsure of the exact steps to tell the mppt where to get the battery temp.
Also have a BMV 712 on the network.
Everything else working great out of the box. Just need to protect my lithium battery with crappy BMS no low temp protection
I have not tried it but i dont think the one connected to the cerbo can be used for the low temp cut off. [Edited] I went to check you can select it in DVCC but test the low temp cut off with it anyway. Also verify that you dont need to adjust the offset (in other words check it is reading correctly)
See the manual here.
Thanks for that i’ve enabled the DVCC and selected the temp input 4 as the source. I can’t try the low temp cutoff again until this weekend but it looks like this should be case closed.
Thanks for the manual too I didn’t realize there was such an extensive HTML manual online. Look forward to reading.
Hmmm seems i’m still having trouble. I used the offset on the battery temp to lower it well below threshold and the charger keeps on going. I’ve waited 30 min just in case there was a timer. Also remotely rebooted the Cerb. Still charging.
In my original post i said everything was hooked up VE.Direct but thats wrong
BMV712 is VE.direct but the Mppt 250/100 is hooked up VE.CAN (Cat 5).
Not sure if this makes a difference? Manual says this for Shared Voltage sense:
“Works with VE.Bus devices, VE.Direct and VE.Can MPPT solar chargers”
Manual does not specify connections supported under shared tempterature sense.
Is the MPPT programmed for low temp cut off?
The DVCC doesn’t mention the use of the temp sensors on the GX for low temp cut off which is why i expressed some doubt as to whether it would work.
You could always add a node red flow i guess
Yeah I’m doubting if this will work. Based on the last pic above the required network is a VE.Smart Network which the Cerbo in not capable of according to the manual. But the BMV 712 and mppt are capable of ve.smart so i guess i bought the wrong battery sensor.
It looks like the BMV temp sensor should work? Create a VE.Smart network between the bmv and mppt and should be good?
Just following up that I finally got it working with the bmv712 hard wired temperature sensor.
It didn’t work out of the box I had to go into ve.smart network options on both the BMV712 and mppt 250/100 and make sure they were connected to the same ve.smart network by using the join existing network button. By default they were both connected to different networks and couldn’t see each other.
Once they were both on the same network the low temp cutoff started working right away.
Makes sense.
One of the limitations of the ve smart network is it is not used with a GX. (Since the GX is the new network manager)
See limitations And Q5
DVCC should have selected the BMV temp sensor and be using it as the documents describes.
