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  1. D

    Arduino cell monitor

    Sorry for the super late reply, did you ever get around to making/finding (a not super over priced) such a thing? I have played around with some wireless (2.4ghz) for arduino but mainly for cnc stuff!
  2. D

    Arduino cell monitor

    Sorry for the worlds longest reply, but thanks! I thought i would pop on this forum again as im planing another build :P
  3. D

    72v replacement kelly controller hall sensor errors

    Well after talking with kelly controls they sorted it out for me, i need to use a voltage source higher than the 5 volt supply of the controller for the hall sensor voltage input, they suggest 6-12 volts, apparently the previous L controller uses a lower pull up value than the new one. sadly the...
  4. D

    72v replacement kelly controller hall sensor errors

    Hello people, I recently got a 72 volt kelly controller to replace a 48 volt one for an e-bike, I copied the settings (120 degree hall sensor being the main one) and the wiring numbers when wiring up the new controller, it all works fine when I power it on, no errors are given, but the moment I...
  5. D

    Arduino cell monitor

    I think it would be up to the ADC precision that limits a voltage divider. Also a multiplexer is just a system that gives multiple inputs a slice of time to access a single channel, the one i made is just hand made it just uses optocouplers/optorelays to switch between the many inputs to the...
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    3x 6 cell li-po config

    I was planing for the time being charging them individually with a iMax B6 balance charger I have, and after charging 3 packs individually gets tiring I may get 2 more iMaxes also i was looking at some other discharge curve it showed 3.4 to be the edge of the "cliff" as some people call it. but...
  7. D

    3x 6 cell li-po config

    I am thinking of getting a 72 volt kelly controller to replace the 48 volt one I have with a 48-72v 3000 watt cyclone motor and running 3x 6 cell li-po cells with it. 18 cells should be around 73.8 volts max, I believe with each cell charged to 4.1v, and at lowest 61.2 volts at 3.4v per cell. I...
  8. D

    Arduino cell monitor

    the voltage input can be compensated for, adjusting for each input does improve the accuracy to about the 0.1 mark as i expected, i should update the code i guess! will re-upload i, it will show 1.1 in the version once i am done
  9. D

    suspension vs hardtail e-bike life

    Hello people, i have a question, would any of you know if using a hard tail over full suspension will do more damage over time quicker hence shortening the overall life span to the electronics on an e-bike, for instance will it shorten the life of a mid drive motor and battery that are mounted...
  10. D

    Arduino cell monitor

    i will take a closer look at the 5 volt output of my voltage regulator and make sure its as close to 5.00 as possible but i am sure 5% tolerance resisters may be at fault here, if in code compensation doesn't work i may try 0.1% tolerance resisters
  11. D

    Arduino cell monitor

    it is just sound for now, a 90db buzzer should get any ones attention and if its to quiet inside a case may want to mount it outside or put small holes in the case next to it so the sound can escape. i am sure if some one was to get a serial alphanumeric display they could easily display the...
  12. D

    Arduino cell monitor

    when you reminded me that resisters are never 100% accurate and may need some adjustments i may do some looking in to the inaccuracy of 4x dividers that maybe sending slight inaccuracy cascades across the voltage calculations in the arduino processing and try do some fine tuning which i never...
  13. D

    Arduino cell monitor

    i was under the impression that using the equation vout=(r2/(r1+r2))*vin, (10000 / (110000 + 10000)) * 60 = 5 volts, also they are such high value resisters that they only pull around 5 micro amps which is the error of my multi meter i have tested it before using it with the multi meter and the...
  14. D

    Arduino cell monitor

    Hello people, I would like to share a finished project of mine, and maybe receive some feed back on a few things. Firstly the project is a simple arduino powered cell voltage monitor for multi-cell battery packs, it just uses 4 analog inputs on an arduino, multiplexes 16 inputs and uses a...
  15. D

    busted lifepo4 cell?

    I cracked open the battery pack and measured the cell directly still negative and stuffed up, cut them out and measured all 3 cells, they all seem stuffed, and it looks like this cell had black permanent marker marks over it while none of the other cells did, odd maybe it was marked as dud but...
  16. D

    busted lifepo4 cell?

    but any idea why the 3 parallel cells making up cell 14 have a negative charge? if they are bust shouldn't they just go really low voltage like 0.5 volts. also i think i will badger the battery seller to get accurate specs on their cells, but if something is genuinely rated to handle 10 amps...
  17. D

    busted lifepo4 cell?

    a lot of people here seem to think i have no clue what i am doing, it was reading full on the battery meter, but as i had stated it very rapidly went to fully empty unable to run the motor in a matter of minutes, i had no intention of running it to zero i was expecting the meter to at least show...
  18. D

    busted lifepo4 cell?

    well i can understand it pulling the full 2400 watts if i am going really really fast or going up a steep hill or accelerating really hard but didn't do any of those just cruising along around 30 kph on flat road around the time it ran out of power so fast, would have been using 1000 watts maybe...
  19. D

    busted lifepo4 cell?

    http://www.batteryspace.com/lifepo426650cell32v3300mah19.8arate10whunapproved.aspx that is the cell there are 3 in parallel per cell giving a peak of 59.5 amps, i also put a fast rupture fuse rated for 32 volt 60 amp on the battery inline so even with out a BMS i have a backup
  20. D

    busted lifepo4 cell?

    alright i measured each cell from terminal to terminal, the first cell was from negative on the main output to the first pin on balancing connections, second cell was from first pin to second pin, so on and the last cell was the last pin and the positive main output 1. 3.3 2. 3.3 3. 3.26 4...
  21. D

    busted lifepo4 cell?

    thing is i have spent plenty of time going up some damn steep hills around 30+ degrees that would have pulled way more current, a few days later i rid it on flats in a bike park voltage was fine then 50+v, then a few days after that was riding on flats again and that's when it all of a sudden...
  22. D

    busted lifepo4 cell?

    Hello people, I am from Australia and have recently started myself an e-bike project (in this damn summer heat!) and this forum seems to be plentiful in similar enthusiastic users so i look forward to learning and doing a lot from every one! but to the point i have an issue: I recently bought a...
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