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MPPT buck converter that isn't optimized for battery recharging?

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  • #31
    I am looking for something similar myself a MPPT Buck/Boost Charger with variable output for charging Lithium Manganese Oxide (LiMn2O4) That is not tied to specific cell voltage like lead acid or LiFePO4.

    I have an unusual setup using Nissan Leaf batteries which are 3.8v nominal per cell

    Per Cell 2 x Cells 3 x Cells 4 x Cells 5 cells 6 cells
    Lithium Manganese Oxide (LiMn2O4)
    Ideal Charge Min 4.1 8.2 12.3 16.4 20.5 24.6
    Ideal Charge Max 4.15 8.3 12.45 16.6 20.75 24.9
    Charge Max 4.2 8.4 12.6 16.8 21 25.2
    Nominal 3.8 7.6 11.4 15.2 19 22.8
    Lithium Iron Phosphate (LiFePO4)
    Ideal Charge Min 3.5 7 10.5 14 17.5 21
    Ideal Charge Max 3.65 7.3 10.95 14.6 18.25 21.9
    Charge Max 3.65 7.3 10.95 14.6 18.25 21.9
    Nominal 3.2 6.4 9.6 12.8 16 19.2
    Lead acid
    Ideal Charge Min 2.3 4.6 6.9 9.2 11.5 13.8
    Ideal Charge Max 2.45 4.9 7.35 9.8 12.25 14.7
    Charge Max 2.45 4.9 7.35 9.8 12.25 14.7
    Nominal 2 4 6 8 10 12
    I found this on Ali-express what do you guys think? My Chinglish is average

    (YF-BKT80V15A) Non isolated four switch synchronisation buck-boost MPPT https://tinyurl.com/yd6adcmr

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    • #32
      That's the miracle of Chinglish. It can mean anything ! Try it and see.

      I'm not sure I can agree with your statement of
      > LiMn2O4 That is not tied to specific cell voltage like lead acid or LiFePO4.
      All batteries have a specific cell voltage at full charge. Exceed that, and you get a surprise fire_1f525.png

      http://batteryuniversity.com/learn/a..._ion_batteries



      Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
      || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
      || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

      solar: http://tinyurl.com/LMR-Solar
      gen: http://tinyurl.com/LMR-Lister

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