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Lithium Battery Stops at 90%

MarineFriend
MarineFriend Member Posts: 20
edited August 2025 in Battery/Electrical & Solar
2023 T@B Boondock just stopped charging when 90% reached. 13.62 volts. Won't go to 100%. 

I am on shore power. So the inverter is charging. Haven't checked the solar panels charging system as I am currently in the shade.

Shore power is good at 120 volts. And I hooked up my Honda eu3200i and it seems good too.

Any clues?
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Comments

  • pthomas745
    pthomas745 Administrator, Moderator Posts: 4,527
    What exact battery or batteries  do you have? The "charged voltage" in your settings may not match what the specific battery requires for the "charged voltage".  
    Look over this Battleborn page that describes how to set up a Victron solar controller with specific values that will swap out whatever Victron has chosen for the default "SmartLithium".   Just use your specific battery values for the Battleborn values here for the "Expert mode".  
    Same thing here for the Shunt.
    (PS: you may already have the Battleborns in the trailer, of course.)
    2017 Outback
    Towed by 2014 Touareg TDi
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  • MarineFriend
    MarineFriend Member Posts: 20

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  • MarineFriend
    MarineFriend Member Posts: 20
    edited August 2025
    I do have Battleborn Batteries. I'm pretty sure I have all these exact settings.

    See the added pic above.

    What do you think?
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  • pthomas745
    pthomas745 Administrator, Moderator Posts: 4,527
    All of the Solar controller voltage numbers are showing a charged battery, or at least a battery with power coming in.  It is the shunt that is only showing the "90 percent" number.
    You should separate out the two different charging setups.  Have a look at the Shunt history and see if it shows any "Synchronizations"  Find out if the solar is giving you a higher "percentage of charge" and a synchronization.
    If the shore power is not getting the battery to a full charge, it may be the setup on the Multiplus needs to be looked at, but I am far from being good at Multiplus settings.
    Plenty of owners here are, however, and they would be able to help.
    2017 Outback
    Towed by 2014 Touareg TDi
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  • MarineFriend
    MarineFriend Member Posts: 20
    The Solar panel charging route seems to work fine.


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  • MarineFriend
    MarineFriend Member Posts: 20
    edited August 2025
    Looking at it now, I see that the Battery voltage was good.

    It was the 90% charged that threw me off. I had not seen that before.
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  • MarineFriend
    MarineFriend Member Posts: 20
    I guess my question now is how does the system calculate the % charged?

    and how do I know it's accurate?
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  • Marceline
    Marceline Member Posts: 1,745
    edited August 2025
    MarineFriend said:
    I guess my question now is how does the system calculate the % charged?

    and how do I know it's accurate?
    My understanding is that it calculates SOC by measuring the current going in and out of the battery (net consumption) and subtracting that from what you've set as the battery capacity. When the battery is initially connected to the SmartShunt, the default SmartShunt setting assumes that the battery is fully charged and synchronizes to 100%. We've seen lots of inaccurate SOC readings because the battery wasn't fully charged when connected to the shunt. 
    San Francisco Bay Area
    2013 CS-S us@gi
    2015 Toyota Tacoma PreRunner Double Cab
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  • ckjs
    ckjs Member Posts: 134
    @MarineFriend: Your MPPT charging voltage is set lower than BattleBorn recommends:
    We recommend a bulk and absorption voltage of 14.4 V. A float is unnecessary since lithium-ion batteries do not leak charge, but a floating voltage under 13.6 V is fine. 
    Try raising the absorption setting to 14.4v.

    Charles & Judy, Santa Cruz, CA
    2018 T@B 320 CS-S; Alde 3020; 4 cyl 2020 Subaru Outback Onyx XT
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  • elbolillo
    elbolillo Member Posts: 549
    Marceline said:
    MarineFriend said:
    I guess my question now is how does the system calculate the % charged?

    and how do I know it's accurate?
    My understanding is that it calculates SOC by measuring the current going in and out of the battery (net consumption) and subtracting that from what you've set as the battery capacity. When the battery is initially connected to the SmartShunt, the default SmartShunt setting assumes that the battery is fully charged and synchronizes to 100%. We've seen lots of inaccurate SOC readings because the battery wasn't fully charged when connected to the shunt. 
    I have never had my LiFePo4 batteries fully charged when connected to the shunt and have never had any problems with correct calculations. If everything is set up correctly when installing the shunt, it will adjust and show correct settings.
    _____________________________________________________
    Ken / 2023 Tab 400 “La Bolita” (31,000+ miles) / 2024 Toyota Sequoia
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