Victron MTTP 75/15 & BMV settings for 2 Lion Energy Lithiums

DIY
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1

I’ve just switched out my two 50 AH agm batteries in series for two Lion Energy 105 AH Lithium batteries in parallel (210 Ah in all). I have a 160 watt solar panel on the roof and an external port for my 200 watt solar suitcase. Each has their own Victron MTTP 75/15 controller, and the entire system has a Victron Smart BVM to monitor everything. This is for a 2022 Tab 400 BD that has a WFCO converter that I’ve switched to Lithium. I called Lion Energy for settings and they were only partially helpful. They didn’t have any suggestions for the BVM settings and gave only a few settings for the MTTP. Can you take look at both and see if these look right? I set the battery capacity to 210, correct? Not sure about synchronizing and calibration either. Images below show my settings for the BMV 1st and MTTP 2nd.

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Low battery is set to 0%, low temp is set to 0C.

Thank you.

2

Mostly OK. I would set

  1. discharge floor to 10%, it is not a control, the time to go is calculated from this.
  2. SOC on reset to “keep existing vale” so if tje BMV loses power it does not go to 100% on restart.
  3. Confirm 14.4V is required for charging, if 14.2V will do then that is better for the cells, the charged voltage would also need reducing to 14.0V to match.
  4. Enable Expert mode and set a maximum absorption time of 1 hour and see how things go, you do not want to spend long periods at absorption voltage. See how things go, you might be able to reduce this.
3

Thank you! Everything seems to be going well with the system.