5% Better than Specified - 105Ah LFP Battery Tests

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  • čas přidán 24. 06. 2024
  • Hakadi Battery 105Ah prismatic LiFePO4 (EVE) cells tested.
    hakadibattery.com/products/ev...
    Capacity test results:
    Cell 1 - 112 Ah
    Cell 2 - 111.1 Ah
    Cell 3 - 111.5 Ah
    Cell 4 - 110.8 Ah
    Internal resistance:
    All cells - 0.29mΩ to 0.30mΩ - at all states of charge (newly supplied, fully charged and fully discharged)
  • Věda a technologie

Komentáře • 28

  • @2000jago
    @2000jago Před 22 dny +4

    One of those will keep my solar weather station going for quite a while...

  • @chillipaste2183
    @chillipaste2183 Před 22 dny +2

    Dear Julian.... you have been an inspiration to me since I bought the magazine EPE with you fruit machine design. (It was a while back) When will you go back to basic circuitry design? Gosh.... you were the first one to explain MOSFETS to an idiot like me. In the meantime I have advanced in circuit design through your wisdom that you generously shared! Enough videos of ready-made boards from china exist already. Much love and respect from Namibia. 🍻

    • @Franksey180
      @Franksey180 Před 20 dny

      Interesting. I enjoy Julian's content anyway and have purchased some items based on his videos. @Julian, maybe some videos reviewing some of your older deisgns/circuits/projects would also be good content?

    • @JulianIlett
      @JulianIlett  Před 19 dny +1

      Thanks Chilli. As components get smaller and my visual acuity declines, I'm finding it easier to work with modules rather than components.

  • @TheEmbeddedHobbyist
    @TheEmbeddedHobbyist Před 22 dny +4

    I like it, fast burning fuel cell and slow burning end caps. You seem to have pegged it. 🙂
    Now all you need in the shed is a few battery hens 🙂

  • @markflack9191
    @markflack9191 Před 24 dny +1

    Looking forward to see you putting these to good use.

  • @ericklein5097
    @ericklein5097 Před 16 dny

    That’s about right. I believe EVE LF105’s (Grade A less than 6 months old) will yield ~111Ah typically. If you buy “Grade A” cells and they just barely pull capacity then you didn’t get Grade A.
    EVE test report sheets are fairly easy to find online so even if you buy another brand you can get a rough idea of what a Grade A of a specific size should pull….except maybe the LF280K’s…those things are just silly, they all pull over 300Ah each so about 10% above their rating.

  • @hi-tech-guy-1823
    @hi-tech-guy-1823 Před 22 dny +1

    one of cells the will Run LoRa - Ripple & Meshtastic for a few years

  • @biezitis
    @biezitis Před 13 dny

    Hi Julian, Did you really notice some bulging when doing pretreatment cycle?

  • @adhdengineer
    @adhdengineer Před 21 dnem

    there's not much point balancing LiFePO4 cells below about 3.4v, the discharge/charge curve is so flat.

    • @john_in_phoenix
      @john_in_phoenix Před 21 dnem

      It's actually counterproductive if they are poor quality cells.

  • @barrieshepherd7694
    @barrieshepherd7694 Před 22 dny

    Sounds like decent equipment performance.
    Can't see how a swelling cell would move the metal endstop as it is screwed down into the base.

    • @john_in_phoenix
      @john_in_phoenix Před 21 dnem

      You would be surprised at the amount of force that swelling cells can exert. Splitting wood and bending metal are not uncommon when people overcharge cells.

  • @BjörnCarlsson-r3v
    @BjörnCarlsson-r3v Před 10 dny

    Are they real Eve grade a cells with valid QR code?

  • @evekenna3625
    @evekenna3625 Před 19 dny

    Hi, I have a hand machine 😉i dropped in my bath stopped working, how do i bring it back to life!!

  • @ahaveland
    @ahaveland Před 21 dnem

    10 A is only about 0.1C so results would be optimistic. Try measuring capacity at 0.2C, 0.5 C and 1C too.

    • @john_in_phoenix
      @john_in_phoenix Před 21 dnem +1

      All of my EVE 104 cells measured above 108ah using 0.2C charge and discharge rates. The 104 an 304AH cells from EVE are high quality. The spec sheet rates the capacity at 0.2C rates, and you should probably avoid a 1C rate unless you really only want a battery that only lasts an hour.

    • @JulianIlett
      @JulianIlett  Před 19 dny

      Ha ha. It took 4 days to do the 0.1C tests. Anyway, moving on to the next video now.

    • @ahaveland
      @ahaveland Před 19 dny

      @@JulianIlett Well, 0.2 C should be a little less than half the time and give more standard results that everyone else uses.
      LFP battery prices are falling quickly, and suppliers have learned from youtubers' feedback - I just snagged a 51V 5kWh rack mount for about £1000 and saved a lot of time and hassle by not having to source all the components separately and then making a hash of it with DIY!
      I'll use it as a solar charged EV range extender.

  • @evekenna3625
    @evekenna3625 Před 19 dny

    Sorry just to clarify, it’s battery operated and get pleasure from !!! 😘

  • @pederb82
    @pederb82 Před 22 dny +2

    That's an excellent BMS. One of the only ones on the market that does balancing properly! :) The others use a resistive balancing, often even only during a charge. On this large a cell it dont matter how many years a BMS like a Daly try to balance, it cant do jack .... vs JK BMS fixed in one cycle :)

    • @john_in_phoenix
      @john_in_phoenix Před 21 dnem

      My JBD has kept my cells in balance for 5 years now, but that is a sample size of 48 cells. If you top balance properly, and have quality cells the passive (actually they are all active) work fine. The "active" balance is good for low quality cells, but you shouldn't believe everything a youtube "influencer" is paid to tell you. Test it yourself, I did.
      Technically speaking, "passive" balance (actually a transistor is turned on to discharge across a resistor) only while charging allows you to maximize the amount of energy actually stored. An active balancer has considerable losses (approximately 50%) when transferring energy from one cell to another, and if not done properly will actually imbalance a pack if not restricted to operation only above 3.45v volts (especially with poor quality cells). Really, you should test yourself, I did. There is a reason Tesla, Rivian and others don't use active balancers.

  • @jlucasound
    @jlucasound Před 21 dnem

    Hi Julian!! 😃🤩😍🔋⚡👍

  • @paulwright8378
    @paulwright8378 Před 22 dny

    In written terms is that 445.3ah

    • @JxH
      @JxH Před 21 dnem +1

      * Ah
      With units, uppercase / lowercase is typically critically important.

    • @ahaveland
      @ahaveland Před 21 dnem +2

      Amp hours are meaningless without voltage, so use watthours instead.
      105 Ah at 12V has the same energy capacity as 420 Ah at 3V or 26.25Ah at 48V
      but they all have the same 1260 Wh capacity.

    • @paulwright8378
      @paulwright8378 Před 21 dnem

      @@ahaveland but he discharged each cell to around 111ah doesn't that add up and he linked them in series so it's definitely 12 to 14 volts

    • @ahaveland
      @ahaveland Před 21 dnem +1

      @@paulwright8378 No. Amp hours don't add up in series, only in parallel when the voltage stays the same.
      1 amp hour at 1000 V is the same energy as 100 Ah at 10 V.
      Watthours add up regardless because that is like the volume of a bucket. A cell's nominal (average) voltage is 3.2 V.
      111 Ah at 3.2 V is a quarter of the energy capacity of 111 Ah at 12.8 V.
      Problem is that people have been using amp hours as a unit for too long, and it's only easily comparable when everything is 12 V.
      Get used to thinking in Wh or kWh instead of amp hours, then you'll always be able to know how big the bucket of energy you have is, regardless of what voltage it has.