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Bonhardt László avatar image
Bonhardt László asked

VRM battery SOC percentage precision.

My VRM dashboard battery percentage only updates at full numbers example "50.0 to 51.0.. 52.0"

in the past i used victron shunt and it updated fine like i had all the precision 50.0 to 50.1 .. 50.2

now the Lynx Shunt i use at the moment seems only reports full numbers to VRM , however in the Victron phone app at the settings where i can set "state of charge" value i can see the correct number with correct scale "50.4%"

Is there a way to fix this so the VRM soc percentage is updated with the correct precision number?

VRMlynx shunt
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JohnC avatar image
JohnC answered ·

Hi @Bonhardt László

I agree with you that SOC should be reported to one decimal point (great for tuning and seeing trends). There's nothing (that I know of) we endusers can adjust to change what we receive in that regard. But your experience is different to mine. I get 1dp on VRM dashboard and hovering on a widget. All good, but Victron Connect has the digits & graphs taking the full digit steps, and that's a stepdown for the graphs, which used to show to 1dp.

I think Victron need to take a closer look at this, not just SOC, but eg. Amps too, which show on VRM to 2dp, but mostly with a lazy zero on the end. Consistency across all the reporting platforms would be a better experience.

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nickdb avatar image nickdb ♦♦ commented ·
With CAN batteries, after some sniffing, I found the SOC broadcast includes a more granular SOC which seems to be ignored by the GX, and thus VRM.

Having created a flow with node red, I was able to display this instead on a node red dashboard. It would be nice, for supported batteries, if we could see 1 decimal point.

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Bonhardt László avatar image Bonhardt László nickdb ♦♦ commented ·

I dig more into this today and found a solution, since the Lynx Shunt is "dumb" after checking the can communication it does not report precise SOC, but it does report a precise consumed amphours number, so instead of working with the reported SOC, modified the batterysoc.py to calculate the SOC based on my capacity / consumedamphours
so now I am able to report a precise number to the VRM :)
1684171540377.png

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