Houston, my VRM isn’t showing the SOC. I’ve unplugged the CERBO and disconnected the black cable to the bmv 702 shunt.. No changes. Not sure what else to do. [Capture] [Capture1]

From the screenshots it looks like all the information is there except SOC 10.3.5. State of charge is missing - 10. Troubleshooting The charge current should be shown as a positive value. For example: 1.45A. What it looks lke is the shunt has to resynchroni…

Thanx for the reply. It loses sync frequently.. (weekly) so I disconnected the black cable to the shunt… then if quit showing. Did your reply just change..? I don’t see the 3? other questions.. and the light on the round gauge stays on now. I’ll check out that troubleshooting link.

I did change my reply. I had a list of things to check then realised there were voltage and amps showing on the widget so it is communicating to the cerbo. Well an easier method might be to disconnect the little red wire. But really there should be no need to disconnect anything at all. If it is …

I have done the manual sync, but I shouldn’t have to. I have 3 BB 100Ah lithiums in series.

Agreed, but the shunt will do that every time it looses power

the little Red wire is for the temp sensor..? I suppose if the battery is shutting down.. There is history in the advanced tab I could check. On the last question.. Isn’t that in the battery settings..?

The temp sensor is red and black. If it is a single red wire with a fuse in it it is power.

Found it. It’s blank and greyed out..

I think the SOC needs to be known for that to be used

SOC in VRM isn't showing

DIY

nickdb (Nick) 26 August 2026 05:27 15

I think you need to dig through the FAQ section where common errors with shunts are discussed.

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SOC in VRM isn't showing

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