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Evel_Knievel

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About Evel_Knievel

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    Houston, TX

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  1. Evel_Knievel

    Safety speed with your EUC

    I understand your point, but I am also an engineer and know that things are designed to a certain design criteria. How many single point failures does an airplane have yet it's incredibly well engineered and safe. Far better engineered than these wheels are for sure! I am certain that cutout is very much a function of the demand you are putting on the system through load, speed, acceleration demands etc...The motor on a KS18S is supposedly 1500 watt continuous output 3600 peak whatever that means, so you'd think they engineered the other components to more less supply and handle that kind of output. I understand that gravity is about the only thing we'll ever see that NEVER fails so your point is well taken...I try and always gear up in preparation for that time when something does fail. I've had a cutout on an NB1 E+ without any protective gear on and it wasn't much fun! 🙁
  2. Evel_Knievel

    Safety speed with your EUC

    Looking for a little guidance...It's my understanding that everyone has a different riding style, weight etc and therefore it's nearly impossible to predict when you are riding unsafely. The EUC's have built in safety alarms which beep and tilt back but these alarms are user defined (I'm not an expert) so I'm struggling to trust those. I would think a better way to approach the question of "am I riding unsafely?" would be to analyze something like wheel log data (as above). I just started to play around with the data so my question is what is the best way to look at this data and tell if you are pushing the wheel close to it's limit? I'm starting to play around with speeds near and soon to be above 40 kph so I want to do it carefully. I've attached my first stab at it. This is a KS18S and in my mind I'm not even getting close to pushing the capability of the wheel...am I wrong? To me it looks like an approximately 600-800 watts sustained motor output, and less than 20 amp draw on the batteries. KS18S (1680 wh) should be able output 1500 watts and 30 amps...right? KS18S Log 06JUN18.pdf
  3. Evel_Knievel

    KS18S Review After 130-miles

    Definitely not the +/- 67.2 volts you'd expect to see with 100% charge. Maybe a problem with one of the batteries. I might try disconnecting one battery and charging each one independently. Check the same screen before you hook up the other battery. See if maybe one goes to 100% percent. If so you've isolated your bad battery. I'm no expect on electronics though. It shouldn't hurt anything to charge them separately. Really odd that you'd have that problem on two wheels though! It can't be the charger if you've tried 4 of them. Interesting!
  4. Evel_Knievel

    KS18S Review After 130-miles

    When I first opened it I disconnected each of the three batteries and measured their voltages which is really the charge state (51.2 volts = 0% / 67.2 volts = 100%). They were reading different voltages which was the first clue. If they are hooked up in parallel they should be equalized (That may be the wrong word, but I don't want to say balanced because that's something different). After replacing the damaged connector, I remeasured the voltages and the third battery was within a couple volts so I just connected and left it overnight. Measured it again the next day and all three batteries measured the same voltage; they had equalized. I'm sure you want batteries pretty close in voltage before you hook them up together. I didn't worry about 2 volts difference though (maybe I should have) .
  5. Evel_Knievel

    KS18S Review After 130-miles

    Nope. Unless I'm completely wrong, "Percent" is strictly a voltage reading. A charge to 67.2 volts which would be 100% on the 16s (2 batteries) or 18s (3 batteries on the 1680 wh version). So I'd bet when you open your app and go to details you'll see closer to 65.6 volts rather than 67.2 volts (90% would be 65.6 volts). With a monster sized battery like the 1680 wh battery in this 18S I plan to typically only charge to 64 volts (or 80%) in order to be easier on the battery. I simply don't need that much range normally. I'll plan to charge to 100% once or twice a year in order to balance the cells. The voltage is independent of the number of batteries that are hooked up in parallel. In this case 2 of 3 were working but it reads 100% since the voltage is being read from the 2 connected batteries. I'm guessing that the app reads the shipped battery size and makes an assumption to the remaining range (but I'm just guessing). In this case I don't think anyone could have known one battery was not functioning correctly unless they did a range test - which Marty did and was suspicious when he got unexpected results. There are a number of chargers out there that you can adjust the voltage on. I have a cycle satiator, but it's expensive. Have you tried a different charger? That's where I would start. What voltage does your app say is on the battery?
  6. Evel_Knievel

    KS18S Review After 130-miles

    Don't get me wrong. Simple fix, and I'm completely happy with the wheel! Love this thing! As far as how it happened I'd guess it's just a matter of cramming three batteries and associated wires into a compartment that small. It was all in there very neatly, but it's tight. Could happen to anyone. Could have been a faulty wire harness from the factory (soldered poorly and finally disconnected). I love being able to track wh's going into the batteries though. Unless your doing that there is no way to know if one battery goes bad. Makes me feel a little more comfortable about the health of the battery. Plus I'm a pretty big nerd
  7. Evel_Knievel

    KS18S Review After 130-miles

    So, I bought this wheel (THE actual one in Marty's video) a month or so back. I didn't see the video until after I had purchased it. Arrived fine, rides like a dream! But I couldn't believe the range so I opened it up and one of the three batteries was disconnected. It of course has three batteries (1x840 + 2x420 - all three connect in parallel through a wire harness) one of the wire sets of the harness had ripped out of the connectors. I didn't have the mindset to notice which one of the batteries was disconnected but very well could have been the 840wh. Anyway replaced the wire harness, charged up to 100% from just under 50% and it took about 900 wh! Rode it on Sunday just over 40 miles, at 17-19 mph top speed, in Houston so it's pretty flat...and it used 49% battery! I'm 175 lbs. So definitely a disconnected battery!
  8. Evel_Knievel

    KS18A flat tire - saved me from a possible accident

    I'm nowhere near that. I only have 93 Km on mine. So maybe I'm good for quite a while. A
  9. Evel_Knievel

    Replacement pads for 14S

    You can order them directly from KS (vicky@szkingsong.com) You'll pay a little more for shipping but when you total everything up it's not that bad. A
  10. Evel_Knievel

    KS18A flat tire - saved me from a possible accident

    I also have a KS18A (even older) than yours (800 w), so thanks! Does anyone know if this has been changed on the KS18S? I also have one of those and ride the hell out of it, so probably building up some good heat! A
  11. Does the 100v Monster use the same seat as the previous versions?
  12. Evel_Knievel

    Ninebot One Z : Z6-Z8-Z10

    I don’t see how you’d access the valve stem. Must be a window somewhere similar to the ninebot E+?
  13. Evel_Knievel

    Ninebot One Z : Z6-Z8-Z10

    Brings up another point...how do you air up the tire? Always thought the ninebot one E+ design complicated that task slightly.
  14. Evel_Knievel

    What is the best personal electric transportation?

    Totally agree. I’m in Houston and it’s pretty spread out. Public transit sucks here!
  15. Evel_Knievel

    What is the best personal electric transportation?

    You’re getting a pretty sound machine. What else are you looking at that can compete with a KS18S? We’ll give you our opinions.
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