I installed the Lynx Shunt VECan 1000 a few days ago and it worked great except for inaccurate voltage readings. I tried the “Battery Voltage Calibration” in the VictronConnect app to correct a 0.75v difference (a big deal for this particular installation) and after going through the process of entering the correct voltage as measured on the Lynx terminals, the voltage was arbitrary set by the app to 0.00v. Battery bank was fully charged with a stable voltage and current. Now when I try to go through the process again, the +/- buttons are grayed out and when I enter a value manually it reverts back to 0.00v no matter what I do.
I tried resetting the unit to factory default values, downgraded firmware to v1.08 then upgraded again to v1.10, shut down the entire system for 10 minutes and nothing helped so now I’m stuck with a Lynx Shunt that only measures current and soc. I also verified with a multimeter that the correct voltage is present at the Lynx Shunt terminals. After resetting all the historical data, the battery voltage is now showing negative and way-out-of-range crazy values. Seems like I’m not the only one with this particular issue. Could you please provide some guidance/fix to address this problem?
Here are the results of our investigation in to this issue:
The main cause is the set CAN bus profile. In this case was set to “VE.Can & CAN-bus BMS”. This however does not work properly with a Lynx Shunt VE.Can. The wrong CAN profile causes certain messages to be used on the CAn bus, but these messages causes errors in the Lynx Shunt, causing it to miss other CAN messages. For the calibration to work properly, the CAN bus profile should be set to “VE.Can & Lynx Ion BMS”.
Another factor causing the 0V problem was a lack of error checking in VictronConnect. This caused it to perform calculations on the new calibration value using wrong value, leading to a wrong outcome. This will be fixed in a future VictronConnect update so it will detect this, show an error and not write a wrong calibration value in the Lynx Shunt.
Unfortunately, once the Lynx shows 0V after a calibration, this can not be solved by the user. When this happens, please create a support request here: https://www.victronenergy.com/support-request
I can’t find the documentation that states that one has to set the protocol to VE.Can & Lynx Ion BMS when using a Lynx Shunt VE.Can. The latest version of the manual for the Lynx Shunt VE.Can is Rev 07 from 10/2024 and it mentions nothing like this. So can someone from Victron please add this to the manual?
I have different problem when calibrating voltage.
After 4 times calibration (because voltage did not change at 3 first tries) my battery temperature sensor started to display -23 degrees.
I checked with another sensor and this also showed -23 degrees. Both sensors are around 34 M omhs so they are working correctly.
Also checked that there is around 5v in the temp sensor pins.
Is there anything that can be done? For me it seems that somehow temperature offset went wrong inside the firmware or something like this.
