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  1. U

    Questionable Vendor behavior

    (yes. The neg. and pos. inside the cell has switched polarity making the voltage of the cell reversed.) Well. Because I think all vendors should have a chance of cleaning up their mess before hanging them out as "bad" publicly. And before that what I am wondering is, and would appreciate...
  2. U

    Questionable Vendor behavior

    A man ordered and payed for a 48V 20Ah Li-ion battery pack form chineese vendor using paypal. After a long wait the battery arrived and the man stored the battery for a little while, since other parts for his build had not arrived. Then when the build started he found that the battery only gave...
  3. U

    Silver Bullet - A 1998 Hoffman "George" BMX conversion

    Lucky kid!!! (You have probably allready thought it yourself: but at some point in time, that kid is going to take initiative to impress dad, by connecting up his own battery.... I hope you have given him the safety-lesson... ;) anyway. Awsome dad!!
  4. U

    48v battery gauge on 44,4v battery (done)

    Yes, I found that out to. Why I went for the trimpot instead of fixed resistors. (Just added a 10k ohm r between the pot and ground, to be sure not to fry the controller output by turning the pot to the max). Since I do not know the exact resistance of the gauge during operation, I am doing a...
  5. U

    48v battery gauge on 44,4v battery (done)

    Solved. (10k resistor + pot) = adjustable voltage divider...
  6. U

    48v battery gauge on 44,4v battery (done)

    Ok. I think I got the answer for the tiny voltage divider circuit i need... Im learning by doing here, so PLEASE correct me if I am wrong (so I do not fry anything testing it) :shock: V(in): 44,4 volt (-from the CA-plug on the controller on 12S pack) V(out): 37 volt (-to the eZee Battery Gauge...
  7. U

    48v battery gauge on 44,4v battery (done)

    edit: Deleted
  8. U

    48v battery gauge on 44,4v battery (done)

    * Second thought: Since The Battery Gauge is a "active" device in that it regulates the controller A-output based on the shunt reading threw the CA-plug: will this voltage modification interupt its behavior or communication with the controller too? I guess the communication-voltage is at 5v both...
  9. U

    48v battery gauge on 44,4v battery (done)

    Not A bad idea, but want to keep it as clean as possible, so want to find a way to configure the unit (if possible).
  10. U

    48v battery gauge on 44,4v battery (done)

    I just tried out Grin`s version of the eZee Battery Gauge with "CA-plug" controller interface. Its a good little product with its basic configurability (although simple), and I can so far recommend it (for its purpos). The bike is built for a non-tech-savy person, so wanted to keep it simple...
  11. U

    Your Creation's Before & After Pics

    Thanks. It is a CroMo fork from Ruff Cycles in germany (with shortened legs on this one). The bike was thrown together out of my left-over parts-bin, so front motor is just a coinsident.
  12. U

    Your Creation's Before & After Pics

    Sorry for bombing this thread. (to much time on my hand lately I guess).... Before: GT Zone BMX After:
  13. U

    My crack at building the fastest hotrod 9C on the planet...

    This fits into my experiences to. Did just above 73 kph (about 45mph) on my last motor with a 20s at 40-some amps.. I do not know the winds on these particular ones, but I am guessing its one of the higher ones based on that number of loaded rpm. But as you say, 4000w+ generated more heat than...
  14. U

    My crack at building the fastest hotrod 9C on the planet...

    Dual-side phase-wires is unfortuanently not an option since the Crogenic needs the other side (but a good idea I need to remember for later). Yeah, there is that thread that learned me to do the wire upgrade in the first place. I have been looking for that :) Thanks Used your how2-post, and a...
  15. U

    My crack at building the fastest hotrod 9C on the planet...

    Thank you for your input. I have not decided on wheel size, but as you say, the smaller the better i guess. Wow, 1000w more mechanical power based solely on lowered winding resistance? That is a good number for any air-cooling system. What kind of motor was he using? (just asking to get a feel...
  16. U

    My crack at building the fastest hotrod 9C on the planet...

    I am amazed with the response and amount of good solutions suggested. I am still working on my resarchpaper on the different parameters and hypoteses of the build, hopefulle comming to one theoretically best way of proceeding with the experiment. Especially I have to calculate the "exact"...
  17. U

    My crack at building the fastest hotrod 9C on the planet...

    Thank you for all the input so far. I will take a "sitdown" and do some maths on the different options tomorrow. As more of you mentioned I also belive one of the keys is in the precooling to get the windings resistance down as low as possible. I will need to look into the actual numbers for...
  18. U

    My crack at building the fastest hotrod 9C on the planet...

    That is a good one :) Both please. Good Air Cooling system for cruising around town and commuting. And "Cryogenic mode" for racing. No "Trailerqueen" 10-second machine :P
  19. U

    My crack at building the fastest hotrod 9C on the planet...

    Yes, thank you Spinning Magnets for the input. I saw the article. What a motor build it is :) The oil cooling option is a very good and interesting idea. But I had planed another more unexplored and potent route in cooling. One that limits operational times and adds to cost though... My initial...
  20. U

    My crack at building the fastest hotrod 9C on the planet...

    Hello. I have to say that I am a physics student, and not really a electrical engineer like a lot of you. Having said that, I hope you dont make to much fun of me when I get stuck on obvious electrical issues. I have been driving and hotrodding 9C`s for little over a year, and have kind of...
  21. U

    Your Creation's Before & After Pics

    Top speed is around 41 kph, with these tyres and 12T wound motors. The tires does take the edge of the bumps at this speed and it is definently more comfortable than a hardtail, but it gets a bit bouncy on tarmac when tyre preassure is set for range/efficiancy. I think a good dual suspension...
  22. U

    Your Creation's Before & After Pics

    Before: Bone stock 2014 Diamant Mammut F4 (not my picture) After: 3000 watt 2WD
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