VRM cell Min Max Scaling on 2 different scales

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question

Jmarc asked Mar 24, '24

VRM cell Min Max Scaling on 2 different scales

Something seems to have changed recently on the VRM display. For the BMS widget Min/max cell Voltage are now on two separate scaling on left the other right. This was not the case before. Both used the Same scale which seems to me the better choice.
We care to have all the cell at the same Voltage. So the Ability to quickly identify when and how cell voltage diverge is critical.
Now the two sets of data appear on two different scaling that are very different from each other which makes analysis difficult. The graph below first made my heart jump until I realized the two curves are on different scales. If easier for you to have left and right scales, at least make then use the same limits.

This seems to be a new issue. I never noticed it before.

VRM BMS

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Modifications Space

Node Red Space

Answer 1 · 2024-03-24T22:12:38Z

Jmarc answered · Mar 24 at 10:12 PM

Well, Just want to add to this Post...
Just, closed the Widget, Re-opened it. Now both data are on the same scale.
Why would this happen? not sure... I mean what made it change behaviour???

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kevgermany ♦♦ commented · Mar 25 at 05:33 AM

@Guy Stewart (Victron Community Manager)

Sounds like a bug

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Answer 2 · 2024-03-25T06:01:03Z

JohnC answered · Mar 25 at 06:01 AM

@Jmarc

The stock Widgets auto-scale. That gap in your data may have caused it. You could try setting up a Custom Widget, then you can set a permanent scale that won't change.

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Guy Stewart (Victron Community Manager) ♦♦ commented · Mar 25 at 06:21 AM

John C has the correct explanation.

Nothing has changed from our end.

With some rare exceptions we do not lock the y-axis for the advanced widgets, they will auto-scale to the data that is available.

Most of the time this is what you want, but it can sometimes cause issues occasionally.

In those cases we have the custom widget tool that allows you to specify your own desired y-axis.

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kevgermany ♦♦ Guy Stewart (Victron Community Manager) ♦♦ commented · Mar 27 at 05:35 AM

I'm surprised that this widget auto scales. I thought about it, thought it shouldn't, at least not differently on the two metrics.

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Answer 3 · 2024-03-26T17:52:59Z

Jmarc answered · Mar 26 at 05:52 PM

thanks for the response.
Not sure what was happening. But I also partly do not understand your answer. As far as I can see, Using Firefox browser, I do not have the ability to change the vertical scale. It seems to always auto-scale. Am I missing something?

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JohnC ♦ commented · Mar 27 at 04:02 AM

@Jmarc

In the 'Select the info...' page, look to the last selection listed - 'Custom Widget'. There you can build your own from scratch and edit it too as you find necessary.

There's a VRM manual on Victron's website that might help.

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Guy Stewart (Victron Community Manager) ♦♦ commented · Mar 27 at 03:46 AM

Hi @Jmarc,

You can change the Y-axis scale by using the 'custom widget' function.

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