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Recharge and use in parallel with different P

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  • Recharge and use in parallel with different P


    Hi everyone , I'm building a solar bike and I would like to connect 2 packs of 36v batteries in parallel, the first is a 10s3p and the second is a 10s 8p. it is possible to use and recharge (mppt booster) at the same time the 2 batteries in parallel ? I have already considered the fact that when I combine the 2 batteries I will bring them to the same voltage.



  • #2
    Too many " IF's "

    If the batteries are both the same chemistry, it might work.
    If the batteries both have compatible internal BMS, it might work

    Short term, you could likely hook it up and it would work. Recharging would take longer, since it's now a larger battery pack and you said nothing about a new charger.

    Early failure would not be considered a surprise.
    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

    Comment


    • #3
      Originally posted by Mike90250 View Post
      Too many " IF's "

      If the batteries are both the same chemistry, it might work.
      If the batteries both have compatible internal BMS, it might work

      Short term, you could likely hook it up and it would work. Recharging would take longer, since it's now a larger battery pack and you said nothing about a new charger.

      Early failure would not be considered a surprise.

      The charger and mppt is this https://www.aliexpress.com/item/E-Bi...48784c4dSx48YW

      And this is bms https://www.aliexpress.com/item/E-bi...3da24c4dYzHipz

      But the size of cells are different , 10s 3p 26650 adn 10s 8p 18650



      Comment


      • #4
        Originally posted by Mike90250 View Post
        Too many " IF's "

        If the batteries are both the same chemistry, it might work.
        If the batteries both have compatible internal BMS, it might work

        Short term, you could likely hook it up and it would work. Recharging would take longer, since it's now a larger battery pack and you said nothing about a new charger.

        Early failure would not be considered a surprise.
        The charger are mppt solar booster CTK-EV-300 , https://www.youtube.com/watch?v=omAhsQqwWSo

        Comment


        • #5
          Sure, uncertified and unmatched parts off aliexpress com Be sure to contact them when your stuff burns up. I would not bother with it. At the very least the batteries all have to be the same. Just a couple of trash salvaged cells from a dump, in a new heat shrink sleeve, built into the pack, will ruin your day, and hopefully not mine.
          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

          Comment

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