VRM Advanced Graphs - Reference Line

DIY
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1

Hi. I actively use VRM to monitor my van systems. I have a graph for my Orion XS that shows input voltage and it’s a useful proxy (when not under load) for my starter battery SoC. I’d really like to be able to add a fixed value line on that y-axis for a 50% SoC at-a-glance warning. I have a VRM alarm set but a visual refence line would be very helpful. Is there a way now or, if not, would there be a way for Victron to enable such a feature?

2

As you are using VRM then presumably you have a GX device like a Cerbo. Enable Node Red, create a virtual battery, inject your required value for your 50% reference voltage to the virtual battery, add your virtual battery voltage and the Orion input voltage to a custom widget in VRM l and voila, you will always have a reference line at your desired voltage along with the Orion input voltage.

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3

I do have a Cerbo GX v2. I’ve not had to get involved with Node Red so far. Is it managable from the VRM remote console?

4

I see in Integrations that I need to enable the Venus OS Large Firmware to make Node-RED available but have so far not found how

5

Settings > General > Firmware > Image Type and select large. You will then be prompted to download the large image which included Node-RED.

6

I selected Large and nothing happened so I’m trying a run firmware update

Thanks so much for this BTW

7

I’ve never used Node-RED. Claude tells me I need to know these things:

  1. The correct MQTT topic path on the Cerbo for a virtual device value
  2. The right interval for publishing (probably every 30 seconds to match VRM logging)
  3. How VRM exposes it as a graphable data source

Now 1 & 2 are unknown to me. £ I suspect will simply be a selectable device.

8

Large firmware installed, Node-RED enabled but I can’t access Node-RED on remote console. From VRM I can now reach Node-RED but how do I register a login? My VRM login doesn’t work

9

I thi nk I have it now. Virtual battery shows in device list at correct volts etc so now I’m just waiting for VRM to log it.

10

It sounds like you are getting there, I have virtual batteries set up and added to custom widgets, the data should come through automatically.

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11

I had selected starter battery voltage as parameter but needed voltage. It’s now set and graphing well. Thanks ever so much, this was excellent advice.