recharging very low batteries???

[Dennis and Melissa]

I have 2 lithionics 320Ah batteries with solar.

They were allowed to sit in the shade for about 2 months.  When I returned today, the batteries were so low the fan for the composting toilet was not running.  That's what I expected.

But I'm surprised to see my VictronConnect app report the batteries at 100%.

I tried resetting the BMV controller (press setup and select at same time for 3 seconds), but that doesn't seem to do anything. 

I'm currently recharging the batteries slowly (solar + household current).
 

Any thoughts?

[Dennis and Melissa]

FWIW, the LI3 Battery app reports each of the batteries at 24% now.

[Dennis and Melissa]

I just watched Victron's video for the BMV-712. It says the batteries need to be fully charged twice a month to allow the monitor to sync.
So, I guess I just charge the things and hope it clears up 🤪

[jd1923]

4 hours ago, Dennis and Melissa said:

But I'm surprised to see my VictronConnect app report the batteries at 100%.

We have to get to the bottom of this, as I have also found the Victron app or the Victron SmartShunt to be unreliable.

i do not have the OTT installed Lithionics but instead self-installed 600AH Epoch batteries. We also have an Epoch app that regularly shows a lower SOC reading.

Note the two pics. The Victron app states we have 54% SOC but it also states AH consumed at -321.7A. This is more than half of our 600 AH which calculates to 46% SOC. The Epoch app (y’all have a Lithionics app) appears to be more accurate showing 43% SOC. Since the battery app is a more conservative reading and appears more accurate, we count on this number when traveling! Hope this helps!

[Rivernerd]

19 hours ago, Dennis and Melissa said:

But I'm surprised to see my VictronConnect app report the batteries at 100%.

This report is consistent with my experience as well.  I have found the LIthionics app provides much more reliable State of Charge (SOC) readings.  I have also found that:  (1) fully recharging my Lithionics batteries, after nearly full discharge (down to 24% SOC) then (2) leaving the charging source connected for a couple more days enables the batteries to rebalance, and the Victron Connect app to read the same as the Lithionics app.

[Dennis and Melissa]

After recharging, everything seems to be back to normal. No worries.  😎 

I think I have learned: "the batteries need to be fully charged twice a month to allow the monitor to sync".

[jd1923]

22 hours ago, Rivernerd said:

leaving the charging source connected for a couple more days enables the batteries to rebalance, and the Victron Connect app to read the same as the Lithionics app.

But then the Victron app will error again as SOC decreases again reading higher then actual, in my experience.

[Rolind]

I have found that the built in battery heaters in my lithionic batteries will also a cause a difference between SOC readings on my Victron Shunt and my Lithionics app. Power use for the internal battery heaters does not register on the Victron.  Not sure if it has been cold enough at your location to trigger the heaters. 

[Rivernerd]

4 hours ago, Rolind said:

Not sure if it has been cold enough at your location to trigger the heaters. 

Thanks for reminding me to turn on the battery heater under my three Lithionics batteries for the winter!  Our local forecast is for temps well below freezing starting tomorrow night.