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  • Advice on battery setup

    Hello,

    I am planning to setup a battery pack to be charged by a 100W solar panel that is made up of three sets of 4s 18650 cells in parallel(these to be specific: https://www.ebay.com.au/itm/Panasoni...53.m2749.l2649)

    Based on the battery specification and from what ever i understood and series and parallel connections, the above setup should give me a base voltage of 14.8V with peak at 16.8V and 10.2 mA current.

    My charge controller has the below ratings:

    Nominal Voltage: 12V / 2V Auto Recognigition
    Rated Charge Current: 30A
    Max PV Input Voltage: 50 VDC
    Equalization Voltage: Sealed: 14.6V; Gel-None; Flooded: 14.8V
    Boost Voltage: Sealed: 14.4V; Gel 14.2V; Flooded: 14.6V
    Float Voltage: 13.8V
    Under Voltage: 12V
    Self consumption: <13mA

    I am also planning to use 4s bms boards with each set of 4s cells.

    Could you please advice if i am on the right track or if i am going wrong in trying to set up a 12V battery back that i plan to run couple of water pumps on rated at 50W in total. Any suggestions would be useful. Thanks.

    PS: The place i am setting this up gets on average 8-9 hours on sunlight.

    Regards,
    Nithin.

  • #2
    Waiting for someone schooled in Li batteries, all I know is that they are easy to light on fire.

    Building a bank out of a bunch of cells is not safe in my book, far too many connections to go bad and make smoke
    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
      What part are you not understanding? It takes a 16.8 volt CC/CV source to charge the batteries. There is only one controller that can do that, a Genasun GV-10-Li-16.7V 10 amp controller using a 60 cell 160 watt panel.

      Bottom line is your panel and controller will not work.

      MSEE, PE

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      • #4
        Thank you for the feedback guys

        Comment


        • #5
          Li-ion has a different charging profile then Lead-Acid. Your need to get a charge controller that is compatible with Li-ion or use Lead-Acid batteries with the charge controller you have.

          Comment


          • #6
            I dont know much about li po but talk to this guy:https://www.youtube.com/watch?v=pYmu8CnnuNk

            Comment


            • #7
              Originally posted by Higher Voltage View Post
              I dont know much about li po but talk to this guy:https://www.youtube.com/watch?v=pYmu8CnnuNk
              Any why is he such a revered authority ?

              [SIZE=16px]Because you are telling a neophyte to trust his house, life, and expensive gear to somebody that was able to set up a youfool acct.[/SIZE]

              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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