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Tadas

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Everything posted by Tadas

  1. Sorry for late reply. Sorry to hear that, that is bad news. At least you know the problem.... Perhaps the previous owner deeply discharged the wheel and left it at 0% charge for days/weeks/months. In this case both battery packs would not be safe, better not use it at all. The risk of fire is not worth it, these things can burn the house down... Maybe buy 2 new battery packs from kingsong? Unfortunately, this will not be cheap
  2. I think it is interesting! At the time of the crash only 2666 W power and only 38 A current! I have had reached 4000 W on my 16x and it was fine, but it was at much lower speed than yours. This supports the theory that at high speed the wheel just lacks voltage due to high motor back EMF. If so, this wheel is quite unsafe above 40 km/h (=25 mph), which is what you've been saying. Thank you! Indeed you are providing the community a valuable service! I will personally try to never exceed 40 kmh = 25 mph on my 16x.
  3. Could you please share your wheellog log around the crash?
  4. This has been my experience as well. To match GPS I need to adjust speed by -6%.
  5. Difficult to say, but my impression is that v1.07 hard is harder than v1.06 hard. That's good, there is a difference in the riding settings and everyone can pick their own.
  6. Hard to say, but I think the hard pedal mode got harder pedals. After upgrading from v1.06 to v1.07 I changed pedal mode from "experient" (WTF??) to "riding" mode to get the rocket feeling back. The softer pedals feel much more fun to me. Whoever is complaining about v1.07, I would first ask if they had tried all pedal modes.
  7. Just came back from riding v1.07. It allowed me to go 32 km/h GPS speed (= 20 mph GPS speed = 34 KS km/h = 21.25 KS mph) down to 65 V under load (= 70 V no load). Didn't even test at lower battery charge, I don't wanna go lower. I like this very much, highly recommend to upgrade from v1.06 to v1.07.
  8. This! Voice control -> voice speech switch. Doesn't help with the tiltback, but it makes much more bearable. Let's wait for v1.07!
  9. 16X is the best wheel for me, but there are also some problems.. Dust inside the wheel is not good. Speed limiting from 50% battery is a problem for those you want to ride >30 km/h. People are passionate about the wheel, it's an amazing wheel, that's why there is passionate to talk about the problems.
  10. Looking at this wheellog log, he discharged the battery fully (cell 3.26 V) at which point he either overpowered the wheel or the wheel turned off.
  11. According to Kingsong posts the speed throttling seems to depend on voltage drop during load. Took me whole day to make this graph, each point is a tiltback event. I don't think anyone else has done such extensive test. Just to be clear on the numbers.. Idle at 76 V, that is around 50%. Driving just from wind resistance the voltage drops to 72 V. Get tiltback at 40 km/h = 25 mph reported speed. Speed gets reduced further as the battery depletes. There is an additional problem that the wheel is reporting higher speed than GPS, so the actual speed is even lower. Maybe it's just me, this depends on tire pressure, I am riding with a lower pressure (=wheel radius is smaller).
  12. I have done a lot of diligent calibration with GPS and for my wheel: gps_speed = 0.94 * ks_speed Real (GPS) speed throttling graph:
  13. If you want to ride above 40 km/h, those tiltbacks will be really really annoying. And they start early, from 76 V idle. If you're happy staying below 30 km/h (=32 km/h wheel speed), then 16X is an amazing wheel!
  14. Just came back from riding v1.06. Logged all the tiltback events, here are the numbers after digging through Wheellog's log. Kingsong reports higher speed compared to GPS, to get real speed I correct kingsong's speed by factor of 0.94. KS16X v1.06 tiltbacks.ods
  15. What about self discharge? If some cells have higher self discharge, they will drain the good cells that are connected in parallel with the bad cells.
  16. Tadas

    Strange sound

    I've have the same on KS18XL, it's a faulty or obstructed fan. I just disconnected mine and ride without a fan. I ride in mostly flat area, so the temperature stays below 50 C.
  17. It's not a fair comparison. We're riding on one wheel. The wheel always needs a reserve of power to maintain balance. If I hit a pothole at high speed and fall forwards, the wheel needs huge power to catch up. Voltage drop is a real thing with the batteries.
  18. I am struggling to find any benefit to 18XL... 18XL probably has better range, but with the huge battery packs, I don't care about range. Agreed!!
  19. First real day of riding the KS16X v1.06 firmware CYT tire (wheel came with non-gyro CYT tire). I'm coming from KS18XL. KS16X is just amazing! It feels much zippier than KS18XL, thing is like a rocket. Accelerating at 2-3 m/s feels just amazing! Hard to express in words, but I am extremely satisfied so far. Have a huge smile on my face while riding. I had so much fun, I leaned too hard, the wheel gave out a beeping warning, but kept balance. Wheellog shows peak power 3980 W, 58 A current! With KS18XL I would never reach 40 A current even going up a hill, but here I reached 58 A going straight. It's just too much fun rocking back and forth. I don't mind the changes they made for v1.06. During my strong lean the voltage dropped from 79 V to 69 V. I understand their logic to protect riders at low battery. Do people who complain monitor their current, voltage and power output? The physics can get really nasty real fast, all you need is one pothole at high speed.
  20. I have KS18XL and now 16X. The 16X seems to demand higher current from the battery, it would explain the need for higher speed throttling than KS18XL.
  21. Call emergency services and pour water on the wheel.
  22. Kg is not a unit of force, but for most it's easier to understand 28 kg force much better than 280 N of force.
  23. 39 km/h = 39000 m/h * (1 hour / 3600 s) = 10.8 m/s Wheel was showing 3070 W of power. At speed 10.8 m/s it was exerting force: 3070 W / (10.8 m/s) = 284 N. That's just 28 kg of force, not that much! But already the power is so huge due to high speed. Assuming a twice heaver rider would need twice bigger balancing force, at the same speed the wheel would need double the power (6 kW!)! Or double of the logged amps. 82 A current total would be 14 A per cell, maybe still possible, but I wouldn't want to risk that. Power = speed * force and all current wheels can be overpowered at high speed.
  24. Tadas

    18XL Tire pressure

    Actually it didn't feel bad, I wouldn't have known it was this bad had I not filmed it!
  25. Tadas

    18XL Tire pressure

    It was mostly a test for myself how the tire would react in case of unexpected bump. I thought those bumps were small actually, the roads here are really bad. I glad I did it, else I would have never known. Mostly stiff legs, not fast, around 15 km/h. I measured the pressure with an external gauge, looks reliable, but I will compare it to others when I can and post if my numbers were off.
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