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  1. O

    Measuring Vruzend kit resistance?

    Serial setup with 2 cells: There are 10 copper plated coins between cells instead of one in order to measure the resistance more accurately. The rightmost coin has very thin balance wire soldered in the middle (too ugly soldering with 30 Watt device). There are coins in the alligater clips...
  2. O

    Measuring Vruzend kit resistance?

    Exciting idea! I made a resistance test with an European Union 5 cent coin in the negative terminal. Result: Perhaps even smaller resistance than the gold plated banana connector, because multimeter showed steadily zero millivolts, 00.0 mV (less than 0.05 mVl I guess). Remains to think and...
  3. O

    Measuring Vruzend kit resistance?

    The resistance between the gold plated banana contact and the cell negative terminal is even less than in the previous image, when moderate pressure is applied. The voltage is so small that my simple multimeter might be unreliable, about 0.05 millivolts perhaps. The numbers fluctuate between...
  4. O

    Measuring Vruzend kit resistance?

    The Vruzend cap for the cell has 4 hops from one material or part to another: 1. from cell to the "springy" part, 2. then to bolt, 3. then to nut 4. then to nickel strip None of these hops have solder in them. From previous image came the idea to try gold connector towards the cell, only one...
  5. O

    Low voltage alarm for many LiPo cells?

    dogman dan, I agree with you in every item.. With an alarm connection for every balancing wire I'll see, if a wire gets loose or burnt or its threads are cut partially or if a screwdriver falls onto cells (!) etc. I'll be interested rather to know too much of the battery, at least to start...
  6. O

    Measuring Vruzend kit resistance?

    One more experiment, the third. This time I filed the end of the cell, which had remains of previous spot welding. The cell had been removed from a commercial bicycle bottle battery. I sprayed CRC to all surfaces. I tightened the nut as hard as I dared(not to damage the threads). 0.3 ampere...
  7. O

    Measuring Vruzend kit resistance?

    I made a different arrangement to find out the resistance of Vruzend parts. I put the parts against each other without the cell. It was necessary to break the plastic to make contact with round parts (the part makes normally contact with the cell terminal, now with each other.) 4-wire...
  8. O

    Measuring Vruzend kit resistance?

    How much do the Vruzend kit "caps" add to the internal resistance of each cell? With 2 Vruzend caps around one 18650 cell and their nickel strips in place I first measured with a voltmeter the resistance between the outer holes of the nickel strips, one probe at plus, another probe at minus...
  9. O

    Low voltage alarm for many LiPo cells?

    Everybody is showing here well packaged elegant battery arrangements. But here are just the opposite, hastily thrown together parts and then riding... I was eager to test Vruzend kits with the simplest possible battery: 10s1p cells of 2 Ah (type 18650, unknown manufacturer). Instead of a BMS I...
  10. O

    Low voltage alarm for many LiPo cells?

    Here is an image of 6 packs of Flightmax 5000 mAh, connected 10S3P.They give 540 watthours (= 0.5 kWh, = 15 Ah at 36V) in theory, weight 4.2 kg. The motor controller ( its display at right) has an undervoltage protection (might be 31.5 V) for the whole battery but not individual cells.You...
  11. O

    Low voltage alarm for many LiPo cells?

    motomech and dogman dan, your replies gave me new ideas and a lot to think. Thanks. I did not know that Hobby King has Multistar packs up to 20 000 mAh at a lower price than I had thought. A kilowatthour about 244 eur including local taxes in European Union! Unfortunately, there are no 5S...
  12. O

    Low voltage alarm for many LiPo cells?

    Low voltage alarm for many LiPo cells? Summary: Is there a simple and cheap way to to get a visual or audible alarm, if ANY LiPo cell voltage goes under a set voltage in my electric bike during riding? (without a bms during discharge). Something like several buzzer alarms...
  13. O

    MULE1.2 Axial flux test motor/bicycle specific

    Thank you for your friendly attitude. :) It has been pleasure to read your knowledgeable and creative texts during several weeks. This groups is quite exceptional in a positive way. With the "principle" I mean axial flux bldc motor with 2 rotors and 1 stator between them like Csiro/Aurora...
  14. O

    MULE1.2 Axial flux test motor/bicycle specific

    A most interesting thread, like a detective story! Does this continue elsewhere or did this project fall asleep? As a comparision e.g. http://scolton.blogspot.com/2010/01/epic-axial-motor-iaprogress.html http://scolton.blogspot.com/search/label/axial%20motor Launchpoint's Halbach motor also...
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