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  1. jumpjack

    Thread for new battery breakthrough PR releases

    What about these new amazing cells from Tesla? They named them 4860.... erroneously, because it should have been 48600 (*), but what about their tech spec? I read "5x energy density" but also "+15% range", so what's wrong here? Which are real specs?!? (*) Lithium battery correct cylindrical...
  2. jumpjack

    Patented (?) method to determine right controller/BLDC wiring

    I can't understand how a person can think of patenting a method... anyway this guy (Jerry Leitz) did it: he patented a method to determine how to connect hall and phase wires between controller and motor... METHOD FOR DETERMINING CORRECT PHASING OF A THREE-PHASE BRUSHLESS DC MOTOR But please...
  3. jumpjack

    Charge 52V Dolphin with this MPT-7210A?

    Is there any tutorial/manual for this regulator? I read it is also for lithium, but cant find any screenshot showing charge curve or battery type.
  4. jumpjack

    Fuse Questions

    To know exact behaviour, currents and timings of a fuse, you have to study the curves in its datasheet. Fuses don't just "break", it's a matter of time and energy.
  5. jumpjack

    Thread for new battery breakthrough PR releases

    New, longlife NCM battery (NCM532/AG) , thanks to new type of electrolyte and "artificial graphite (AG)": up to 5000 cycles at 1C and DoD100%, 1 year storage time without self-discharge: http://jes.ecsdl.org/content/166/13/A3031.full
  6. jumpjack

    Kelly Controllers Configuration Program - a Definitive Translation

    Did anybody figure out what this slider actually means? Could it be the width of the "joystick dead zone"?
  7. jumpjack

    Sinusoidal wave brushless motor controller

    I also tried decoding the error codes, I obtained this picture: This BASIC source decodes the raw data into human readable error messages (if above picture is right): Sub conv(Data9Data10) Dim ErrorText(15) Dim ErrorNum(15) ​ ErrorText(0) = "n/a 1" ErrorText(1) = "Trac­tion battery over...
  8. jumpjack

    Sinusoidal wave brushless motor controller

    using documentation available around and documwntation from Kelly, I was able to build this table: It summarizes all serial commands I am aware of. I didn't start experimenting yet, anyway I'm going to do that using an ESP32 module rather than an arduino, as it has builtin wifi, bluetooth and...
  9. jumpjack

    Kelly, CANBUS and Arduino

    Found something about Kelly usage of CANBUS protocol: http://www.oblibene.biz/userdata/shopimg/elektrolode/file/KBL%20User%20Manual.pdf Table 2: KBL Controller CAN Commands List (page 15) Any suggestion about USB/CANBUS module which could be used both on PC and on Arduino? I also received...
  10. jumpjack

    Connection diagram of an advanced BMS in an EV

    They were recently published two interesting documents describing in detail the connections of an "advanced" BMS inside an EV. "Advanced" because it does not just manage the cells, but the whole vehicle, thanks to several contactors and sensors. The BMS comes in two variants: modular (BMS-M12...
  11. jumpjack

    Random power cut issues

    How can I usae CANBUS to read data from a kelly controller?
  12. jumpjack

    Power cut issues with Kelly KHB72701

    The power arriving to my motor is sometimes cut down from nominal 5 kW to 4 kW, then 3kW, and eventually to 0.8 kW (10A at 80V). BUT Battery is full (80V for a 72V nominal battery). Cells are fine (lowest is at 3.3V, highest is 3.34V) Temperature can vary from 15°C to 35°C when problem arises...
  13. jumpjack

    Random power cut issues

    I am encountering some issues on my electric car since some months, and nobody here appears to be able to figure out what is going on, even the shop which sold it to me; they totally replaced the BMS and the service battery, thinking that they could in some way affect the electrical system of...
  14. jumpjack

    Highest capacity 18650 cells

    I am talking of raw numbers, not charts.
  15. jumpjack

    Highest capacity 18650 cells

    If database on https://lygte-info.dk/ was public it would be possible to create a sparse chart showing various LVC values. Is there a method to access raw data?
  16. jumpjack

    Highest capacity 18650 cells

    This issue just came out in another thread, so I created this image which joins two different discharge curves, comparing a samsung cell with an unknown cell from https://www.powerstream.com/lithium-phosphate-charge-voltage.htm ...
  17. jumpjack

    my 18650 frame pack build

    Indeed the INR18650-30Q charts looks very different fromt that on the site I found. Which means that each lithium cell management system must be calibrated for each specific cell variant. According to charts, discharging the cell on the site I found down to 2,5V would be like discharging an...
  18. jumpjack

    Nickel welding strips - current capability ??

    The "unadequacy" of spot-welded nickel strips is an urban legend, just like venting hole of old A123 cells, which even led to building nickel strips with a hole to prevent hole from being covered! Useless holes in strips: Details...
  19. jumpjack

    Highest capacity 18650 cells

    Sounds interesting, any link to any paper with charts&tables?
  20. jumpjack

    bluetooth BMS?

    I really don't get why you say that. Did you ever try them, or have just seen them in picture? It of course depends on application (i.e. current flow), just do calculation. Single strips are around 10x0.3mm (=3mm 2) in section and just 40mm long. Multicell strips can of course carry much more...
  21. jumpjack

    my 18650 frame pack build

    I found a "dangerous" site from which I obtained data which you can be interested on: w w w .powerstream.com/lithium-phosphate-charge-voltage.htm (not directly linked because it abuses lithium cells) The data I got...
  22. jumpjack

    my 18650 frame pack build

    WARNING! This pack is very nice... but it's just a "pack", it's not a "battery". This is a "pack" of cells: Also this is just a "pack" of cells: This is a "battery": The difference is made by these: Multiple version: The point is: the "can" of a lithium cell is also its negative...
  23. jumpjack

    bluetooth BMS?

    in a "road application", cells should NEVER touch one to the other: only a very thin foil of plastic separates alluminum bodies of adiacent cells, and it wears out a little at each vibration, until you get a short circuit, regardless of how many cool things & wrappings you use to cover the...
  24. jumpjack

    bluetooth BMS?

    This is a very dangerous - but common - method to build batteries, without any holder. Unfortunately, road vibrations will soon cause shortcircuits and falmes in such a battery. Always use holders! That said... I didn't read the whole thread, but I read some other ones, and I see there are...
  25. jumpjack

    Bluetooth 10-15s bms review

    Sorry I don't get if somebody was able to reflash the firmware of this BMS. I also don't understand where the Windows screenshots come from, I only found the Android app. And finally, is this firmware compatible with this BMS? But where is the original sparkfun BMS? I can't find it.
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