question

Still the same today... any ideas or comments ?

Hello @mkuiken,

Thank you for chiming in. You hit the nail on the head indeed. For some reason, MPPT switched to Smartshunt 500 for the temp data although SS500 wasn't providing any data as it's Aux Input was set to "None".

After I cycled the Aux Input to "Starter Battery" then to "None" again, SS500 released the temp data line to SBS and all went back to normal.

However, I'm still curious to know how this can happen without me changing anything physically on the circuit or any of the settings. I 'll keep an eye on the system and if it happes again I know how to fix it thanks to your great advice.

Thank you so much, much appreciated.

Best

Sedat

Hi @bilgebay

Good to hear you were able to locate and fix the problem. Obviously this is unexpected behavior so please let me know if this happens again. Please also check the VE.Smart Networking status of the SmartShunt next time: does it report to be transmitting battery temperature? And if so, is the temperature then also shown in the main status page of the SmartShunt?

Also, do you remember if you performed any firmware updates to any of the devices just prior to this issue happening? Or possibly a reboot of any of the devices you happen to observe?

Oh and last question: what's firmware version of the SmartShunt Bluetooth Interface (so not the v4.08 version of the Shunt itself)?

You can check the firmware version on the Product Info page in the Settings menu but you can also send a service report so I can look it up (see https://www.victronenergy.com/media/pg/VictronConnect_Manual/en/troubleshooting.html?utm_source=offline&utm_medium=qr&utm_campaign=qr%20code%20products#UUID-98bc9211-902b-01a0-96b9-1f314c4d63c5 if you don't know how to make a service report).

BR

Martijn

@mkuiken

Hello Martijn,

Thanks, for sure I will let you know if this happens again. I did a reboot for the whole system but this was on the 21st of March, 5 days prior to this anomaly which occurred on the 26th. Prior to this, the temp value was normal and the MPPT was charging the batteries during day time. Please see the graphs for the 7 days period below.

I don't remember performing any firmware updates. I will check the other points when I'm near my trailer.

Thanks again and best regards

Sedat

PS I have purchased a temperature sensor for BMV702/712 because I want to see the battery temp on VRM. I will use the SBS else where or I will sell it to a friend.

PS2 I decided to make use of this incident to test my new parallel battery bank which comprises of 2x 100Ah Lifepo4 batteries. I have disabled the MPPT to see the discharge performance... it wil take another 4 days, at least :)

... and the Bluetooth Interface Firmware version is 2.37.

Best

Sedat

Just dropping by to mention that this just happened to me too. Both Smartshunt MPPT 100/30 and MPPT 100/15 registered -18 degrees battery temperature and no charging happened. I have no temp sensor. I also have a Smartshunt 500A, a 12V/200A Lifepo4 battery and a Raspberry pi with VenusOS v2.93.

I managed to remove the sensor reading somehow, but I'm not exactly sure how. I did cycle the Aux Input on the Smartshunt to "Starter Battery" then to "None" again, as suggested above, but I also did other things.

I think it happened a couple of months ago too. I'll try to figure out how I fixed it off or happens again.

I'm on the latest firmwares.

https://community.victronenergy.com/questions/203617/mppt-displays-negative-temp-and-stops-charging-eve.html