question

roblatour avatar image
roblatour asked

Sudden jump of battery SOC from 93% to 100%

I have a little monitor at my desk which shows me, amongst other things, the percent of charge of my battery. The monitor basically just listens to the MQTT publications of Venus, and displays the data updating the screen in real time. It has been working reliably for months.

However, today I was looking at it and notice the battery's soc jump from 93% to 100%.

Thinking back, I don't ever remember seeing it reporting between 95% and 100%, just 100%.

I double checked my vrm graph on Victron Energy's service and it seems to back this up:

https://ibb.co/y5wsR0M

Is this normal?



Venus OS
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4 Answers
Alexandra avatar image
Alexandra answered ·

@RobLatour

If your inverter internal monitor is set to 93% when bulk is finished then it is likely it is switching over to trigger full just after that.

It happens especially if the charge current drips off suddenly. Dont forget the ve bus does not have a shunt, so its really just some cleverish maths that makes the SOC calculation happen.

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roblatour answered ·

Well the inverter was off, it has just been slowly charging through the day (a dark and cloudy day I might add) via the mppt charger.

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pwfarnell answered ·

What battery monitor do you have and what are its settings.

Have a look at a post on the new Victron community site that we will be transferring to shortly.

https://victron.discourse.group/t/shunt-battery-monitor-jumping-to-100-or-reporting-a-high-soc-when-the-volts-are-low-and-or-the-bms-has-disconnected/88/3

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roblatour answered ·

The battery monitor is something I built myself;

https://github.com/roblatour/ESP32RemoteForVictron

but like I said, it just listens for changes in the SOC value from venus mqtt publications, and then refreshes the screen with them in real time.


Thanks for the link on the new site, I took a quick look at it but its quite hefty and I'm quite tired, will look at it in more depth tomorrow :-)


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Related Resources

Victron Venus OS Open Source intro page

Venus OS GitHub (please do not post to this)