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  1. Silvaticus

    kWeld - "Next level" DIY battery spot welder

    Not sure if this was addressed to me. However, long thin wires act as a current limiting resistor. Thereby increasing the overall resistance of the system. In addition, the overall efficiency is reduced. From personal experience, the most significant adjustment to the resistance of the entire...
  2. Silvaticus

    kWeld - "Next level" DIY battery spot welder

    The total length of the conductors is over three meters or 10 feet? Why do you need such long wires? Are you planning to use them as a heater? :) After all, Frank recommends trying to bring the value closer to 1 meter. You can connect your modules in parallel, although this will further...
  3. Silvaticus

    Looking for 18650 (or similar) battery cells in EU - new or used

    https://www.nkon.nl
  4. Silvaticus

    SICB 2.4V10ah LTO battery

    Well, it's not difficult. :) In fact, I was not sure that his / their actions did not violate any of the forum rules. That why I have placed these links for your solution.
  5. Silvaticus

    DIY Arduino timed spot-welder, FET-switched, adj. pulse

    Here's what I came across on the web on this issue. «A simplified model of a capacitor is shown below. It consists of: Cp = parallel capacitance, or the bulk capacitance. In your case, the 1020uF capacitance. Rp = parallel resistance, or, the leakage resistance. Typically in the tens of meg-ohm...
  6. Silvaticus

    SICB 2.4V10ah LTO battery

    Obviously, this is a self-promotion of a Chinese factory. He has a link to the site in his profile: http://www.senberrybattery.com https://endless-sphere.com/forums/viewtopic.php?f=31&t=113746 https://senberry.en.alibaba.com...
  7. Silvaticus

    Li-Ion Cylindrical Cell Battery Pack Remaining Capacity v Resting Voltage Table

    Hi. Could you tell me for what chemistry was your table made? The fact is that these numbers vary slightly depending on the type of elements and chemistry. I have never delved deeply into these differences. Once upon a time we made a summary table about capacities depending on voltage. All data...
  8. Silvaticus

    DIY Arduino timed spot-welder, FET-switched, adj. pulse

    As far as I know, in a closed circuit, the current is the same in any of its sections. Therefore, the maximum achievable current depends on the total impedance of this section. We omit the voltage dependence, since we are considering the conditions for the same system. Am I interpreting your...
  9. Silvaticus

    DIY Arduino timed spot-welder, FET-switched, adj. pulse

    Thanks for the more detailed answer. Now everything is clearing up. Judging by the manufacturer's datasheets, if you manage to achieve a total resistance of no more than 2.33mΩ in your 3S3P assembly, then the maximum current (as it seems to me, it is the short-circuit current) that you can get...
  10. Silvaticus

    Sourcing 21700 cells from Korea, Japan or China, 10,000 cells

    I just thought you had lost interest. I replied to you in PM. Good luck.
  11. Silvaticus

    DIY Arduino timed spot-welder, FET-switched, adj. pulse

    The question was quite simple. How is it possible to connect 3 super capacitors in series to get a current almost 5 times higher than the current from the manufacturer's datasheet. I do not have an oscilloscope and I am not able to take such measurements. In this regard, I asked how accurate...
  12. Silvaticus

    DIY Arduino timed spot-welder, FET-switched, adj. pulse

    How did you manage to trick the laws of physics and Ohm's law? What is your total system resistance with open mosfets? You have three super capacitors in series. This means that the total current source resistance (Ri) near 0.8mΩ. The physical limit of your current source is at 800A according...
  13. Silvaticus

    Sourcing 21700 cells from Korea, Japan or China, 10,000 cells

    I wrote to the merchant that you weren't interested.
  14. Silvaticus

    kWeld - "Next level" DIY battery spot welder

    Now it is clear why I did not know anything about it.
  15. Silvaticus

    kWeld - "Next level" DIY battery spot welder

    I am not following the project. And where is it written about 3kA? When I went to the project page before writing the post, I did not see anything about it. Maybe I wasn't paying attention enough.
  16. Silvaticus

    Sourcing 21700 cells from Korea, Japan or China, 10,000 cells

    I asked him and he confirmed that he can send the goods directly from Hong Kong to India. Send me your contacts in PM. He asks to send them to him and he will contact you.
  17. Silvaticus

    Sourcing 21700 cells from Korea, Japan or China, 10,000 cells

    As far as I know, even very reliable sellers (each trader keeps his supplier inaccessible to someone else's knowledge) in China ran out of quality Tesla cells 4-5 months ago. I know a trader who bought who took two metric tons of completely new Tesla 21700 cells with positive pads already welded...
  18. Silvaticus

    kWeld - "Next level" DIY battery spot welder

    Never mind, I'm just a little sarcastic. Yes, the Malectrics V4 project is very interesting, but after so many generations it has not overcome the 1kA barrier, which is a pity. Frank made the right choice by doubling it. For many simple tasks, this is quite enough. However, my colleague is quite...
  19. Silvaticus

    kWeld - "Next level" DIY battery spot welder

    I understand that you, as a reseller, will compliment Frank's work. Welding points of kWeld are on the level or slightly better than welders based on MOT 2x1kW. Of course, even on very good transformer-based welders, we always have 10 percent or more of poor quality weld spots. I've seen this...
  20. Silvaticus

    kWeld - "Next level" DIY battery spot welder

    Three miles from the house they weld with this welder. Only the cost of such a welder is about 10-12k GBP.
  21. Silvaticus

    Ebike touring and camping

    A cool idea to travel if you take the necessary precaution as already mentioned. I will allow myself a few thoughts of my own. Firstly, as I wrote earlier, you can charge two or more batteries with one charge. However, at the time of the start of charging, their voltage should be identical. It...
  22. Silvaticus

    Haibike battery connector replacement

    What keeps you from replacing with a non-standard connector? If a direct way cannot be taken, there is always a loophole. Why don't you choose something from the Neutrik products? Neutrik PDF
  23. Silvaticus

    Haibike battery connector replacement

    https://www.ebay.co.uk/itm/174910120228 ??? https://www.google.com/search?q=Haibike+Sduro+E-Bike+%7C+4pin+Yamaha+Battery+Charging+Connector&client=opera&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjq8p3VwPXyAhUFglwKHebvCjwQ_AUoAnoECAEQBA&biw=1880&bih=1069 ???
  24. Silvaticus

    Does this make sense? (no chain or belt, pedal operated generator and wires to the rear hub motor)

    Of course, the lack of maintenance on a traditional manual transmission is a good thing. But there is too high a price to be paid for this. Also, everything lacks the ability to use reduction with the gears. However, a healthy and not-so-old cyclist will regularly experience rotor slip when...
  25. Silvaticus

    Does this make sense? (no chain or belt, pedal operated generator and wires to the rear hub motor)

    As a good illustration, we can turn to the story of the fall of Nokia.
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