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  1. K

    Full balance charger every time.

    Please consider the accuracy of the TP4056 module is pretty low, the datasheet says Charge Voltage with 1.5% Accuracy. This means you can end up anywhere between 4.137v and 4.263v. While an RC charger has a typical 0.2% accuracy, charge voltage 4.2v +- 10mV. You can find some real life test info...
  2. K

    Cell matching software

    Guys, can you give details about the underlying solution to this problem? Is this the k-partitioning problem? What optimization tools/algorithms can be used? I'm having problem matching my cells, because the cells have high internal resistance and a sort of 'residual capacity', meaning that...
  3. K

    Prismatic LiCo

    The term 'Prismatic' refers to the form factor(shape) of the battery cells. Laptop cells come in either cylindrical or prismatic form. By far the most common cell geometry used in laptop batteries are the 18650 cylindrical cells, which are a cylinder with 18mm diameter(9 mm radius) and 65mm...
  4. K

    Maximize 12FET controller performance

    Thanks for the additional info gwhy! My understanding is that phase amp is what really matters for FET durability. When a controller is fully loaded set to say 100A phase will generate the same amount of heat in a FET with no regard to battery voltage if it is 24v or 100v. I'm not sure how...
  5. K

    Maximize 12FET controller performance

    It is more simple, but not as explicit, it could be that you are running 100v with 100amp phase and 48amp battery, or 50v with 200A phase and 96A battery. For a FET that is limited in current (and voltage) is not the same. So, Thanks, Zsolt
  6. K

    Maximize 12FET controller performance

    Could you please add some detail? What type of controller do you have, what FETs is using, what are your settings (battery/phase amps), are you using the stock shunt(aprox resistance if you know), what battery and motor are you using?
  7. K

    Maximize 12FET controller performance

    I want to bring out maximum performance from my 12 FET controller. What would be the max. safe Phase/battery current? It is a EB212 controller with stock shunt(2 wires, aprox 2.5mOhm), fitted with (12) 4110 FETs. Battery and Phase traces have been beefed up considerably, battery wires are aprox...
  8. K

    SOLVED! Infineon Cutting out Question

    I'm experiencing cutouts as well with my 6Fet and 12Fet controllers fitted with 4110 FETs. I'm using 9C 9x7 motor. The 6FET controller works fine with 20A battery, but set to 40A battery/100A Phase it cuts out. The 12 FET controller I have set to 57A battery (max in Parameter designer) on the...
  9. K

    Yet Another Laptop Battery Pack Build!

    I have about 6-8 cycles on them, one or two were deep discharges, to what I call 100% DOD. I'm running them without a BMS, on charge they are about max 0.02-0.03v apart, but I do not charge them to full 4.20v/cell. At the low end they are still in balance of 2-3 mV difference to about 15Ah, but...
  10. K

    Yet Another Laptop Battery Pack Build!

    These are well engineered cells, probably made by Panasonic, they are manufactured in Japan, in aluminum cases, every cell has it's own fuse, so they should be Ok. Yes, they are old technology/chemistry, they have not been maintained/conditioned correctly, so they are to be handled with care and...
  11. K

    Yet Another Laptop Battery Pack Build!

    These batteries came in original factory packages, so very probable they have never been used, just self discharged very very slowly. It's a big difference compared to DISCHARGING them to 0.0v or even reverse them for some moments. And 85% capacity for 0 cycles is not a good thing, taking into...
  12. K

    Yet Another Laptop Battery Pack Build!

    Sorry, it is actually 14P12S as one laptop battery consists of 2P3S prismatic cells. Originally rated 10.8v, 3.6Ah, so cells were 1.8ah nominal when new. Based on my testings, cells deliver around 1.5-1.6Ah when charged to 4.2v on low current consumption(controller is limited to 20A, so <1C...
  13. K

    Yet Another Laptop Battery Pack Build!

    I have completed the battery few weeks ago. I have built it from 28 laptop packs, paralleling 7 batteries, and putting 4 in series. Making a total of 12S7p. First ran consumed 19.6Ah, around 850Wh, on 63km distance, controller limited to 15A. At that point one of the cell groups was almost...
  14. K

    Hooked controller reversed - blown

    Ok, thanks for your responses, I have learned some from this mistake. I have installed every component on the new pcb, so I am using it for now. I will come back and troubleshoot the old one, if I get some new FETs and voltage regulators. New pcb cuts out from a stand on high current(set to 40A...
  15. K

    What is the quietest motor?

    Is the Crystalyte skewed stator design smoothing out torque ripple and reducing motor noise or it has effect only on cogging?
  16. K

    Hooked controller reversed - blown

    I've took a look on the controller today. It has the main cap(100v470uF) slightly puffed and the legs melted, one of them was totally disconnected. But there is another smaller (100v100uF) after the shunt that seems OK.(reverse polarity blew the shunt). I have separated the ignition wire and...
  17. K

    What is the quietest motor?

    I had a geared BMC motor and yes it does have a whine because of the gears and the commutation causes an audible resonance on my steel frame/rack on low speed/acceleration. I wanted to try a direct drive hub to experiment with regeneration, and went with 9C because it seemed the best compromise...
  18. K

    Hooked controller reversed - blown

    Thank you guys for you responses, I didn't have time to get back to this, but will troubleshoot it again ASAP. First I will check and replace the input caps. I know there is a big one, but there might be a little one too? Need to check. Next I will try out if reprogramming with my USB harness...
  19. K

    Hooked controller reversed - blown

    Thanks a lot Ricky for your detailed explanations. Sigh, the shunt literally evaporated and all 3 low side FETs died. Could not see any trace problem(had beefed up traces). Measured resistance between source-drain and indicated 0 Ohms for the 3 low side FETs. Replaced the 3 FETs, inserted new...
  20. K

    Hooked controller reversed - blown

    Thanks for your tips. I do feel resistance when motor is rotated, just like regen, so some FETs are blown. I will try to disconnect phase by phase, so I will see on which phase are blown. I don't know what's the difference between high side and low side fets, and which are which, can they both...
  21. K

    Hooked controller reversed - blown

    Had a melted battery connector that I was fixing. However, after the fix, I've hooked up my 206 Infineon controller to reversed polarity. I saw a big spark in my switch, and a short current burst heated up my connector. Now controller won't work and CA DP displays 56A no load. What could have...
  22. K

    Yet Another Laptop Battery Pack Build!

    Got the surplus 30 packs yesterday. I have charged up a pack to 4.1v / cell, but dunno exactly how much went in, because I found the RC charger with connection error, but cells were at 4.07v. Unfortunately I have already shorted a pack and 4 cells fused, there is a small fuse inside the grey cap...
  23. K

    XPD: open-source keywin e-bike lab replacement

    This is really great work, that extends the capabilities of the original program. This is useful for setting custom LVC(I think original version had no values between 42.5v to 50v). I'd like to see if it can set speed less than 30%. And regen braking stronger than level 2.
  24. K

    twitchy throttle response problem

    Hi tef, Yes, i have changed the controller. It was the slow start version made for geared motors, and I switched to an instant start controller. This is much more smoother, because the response has smaller latency. My problem was that when I hit throttle, above a certain threshold it always...
  25. K

    CA accuracy?

    I'm surprised no one replied. I thought almost everyone here uses a CA. Are you seeing voltage drifting and current variation of more than 0.1A while idle(low res)? Do you have any idea why the current display was not linear in response to the RC charger's output? Should I try to setup with an...
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