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  1. W

    Hobby King LiFePo4

    I stated a few months back, to provide update if these failed. Tad disappointing two newer packs acted up after only a few months. Funny, the battery that was rebuilt from frying the tap, seems to still be going strong - it wasn't my over current experiment battery that was the shortfall...
  2. W

    Hobby King LiFePo4

    Statistics says a lot, and frankly, we'll never know what sort of reject rate that they have. My belief is they sell tons. If quality suffers too much, they'll lose market share. "Who makes HK brand?" they states on their web site that the make slurry, pack electrolyte, and do final package...
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    Hobby King LiFePo4

    Repaired the balance taps, which were toasted . hey, note am not advocating a HK or Cellman, but FWIW . bit more results on HK LFP - I've run this 9 lb , 4 pack (4x4s 8400) aprox 10 times for 50 miles. Typical cell variation is about 0.06 (hardly,' way out of balance'). I may not be...
  4. W

    GNG, 1000W 48V BB-drive, $400

    I recv'd 3 units from GNG. One with China Air post, and two via EMS. I recall the EMS was a 20-30$ uptick in cost. (updated, per email from GNG, max upgrade is $40, from ~80 to $120) "" Sea mail US$78 8-12 weeks arrive,air mail US$98 2-3 weeks arrive,speed post US$119 3-7 days "" I would never...
  5. W

    GNG, 1000W 48V BB-drive, $400

    So.. reduction drive thread splits to two, radical departure redesign (Miles branch seed - ES mid drive), and upgrades to GNG (here), is my understanding. For either path (new build or GNG), this 'gear currie' reduction drive, on 1000watt brushed scooter -...
  6. W

    Hobby King LiFePo4

    Was checking back the Feb thread on HK LFP & $/watt, looks like LFP has come down 25-30% in recent months (didn't know that, hadn't seen this prior, didn't know better, just ordered some). The points about A123 built up with BMS, ready to roll certainly make sense if you aren't changing your...
  7. W

    GNG, 1000W 48V BB-drive, $400

    Still wondering if anyone's figured out is this small pulley part of the electric motor's armature shaft ?? - ; FWIW, my undergraduate is structural mechanics - the chain 'pull' is eccentric to the motor / bike/ mount hardware centerline, so there's definitely a 'torque' on the motor assembly...
  8. W

    Hobby King LiFePo4

    Took couple 4s batteries apart for the heck of it, toasted balance tap with a bit of bad plumbing... gonna fix it. cells look fine & individual voltage is still ok, yep, such a noob here. Ha.
  9. W

    Hobby King LiFePo4

    I don't think anyone said 'cheap and great', .. I think my comment was about the little $5 cell meter & peep buzzer warning ... anyway .. simply state what it cost, volts and amps it is delivering on some rides- folks can decide for them self what to get. The HK, supposedly will warrant...
  10. W

    GNG, 1000W 48V BB-drive, $400

    No doubt, windtalker, you are a fine testing platform... I don't ride that hard. IF the power lead is on the bottom of the motor - For sure rotate the power lead from the motor, up, and not have it exit right at the rock attack spot. I had one motor that was setup that way initially, but the...
  11. W

    Hobby King LiFePo4

    9 lb pack (8400 4s) has about 4x 5x @5-6 mile short runs with several steep pitch, max 1100 watt peak draw (20+amp) - about 110 to 200 watt pulled total per ride (as recalling, what the amp meter stated). For first tests, it's working fine I guess - but no expert here with Li-Po & bikes.. ...
  12. W

    GNG, 1000W 48V BB-drive, $400

    Well stated .. the 'high' end with a bit too high of a cadence, doesn't happen often on my routine jaunts mostly off pavement. Road bike use with lot's of high speed, could be more of a nuisance not being able to keep up. Not sure where most folks are 'from' experience wise, but 1kw peak...
  13. W

    GNG, 1000W 48V BB-drive, $400

    Great free ride video, btw. very nice THROTTLE response - Cyclebutt Your throttle twist hall sounds bad to me. I tried a three different hall twist throttles and found the response with stock GNG 48v controller to be identical with two GNG twists, but was notably smoother with a different...
  14. W

    GNG, 1000W 48V BB-drive, $400

    Don't laugh too hard, LoL- found the 8spd hub was stuck because underside GNG throttle ring was in the way (even with rotating 'up') - truly, DOH! moment. Twist shifters, reference 3,7,8, & 9 spd options -...
  15. W

    GNG BB drive (Sensorless)

    Could you describe that Lyen 3 spd function a bit more detail, does that set the upper volt limit which the throttle has full range? or is it full volts, but changes the phase frequency? Provides a better throttle control at the lower end of speed for more trails type rides? If yes, that's...
  16. W

    GNG, 1000W 48V BB-drive, $400

    Miles. You may be an expert, but as a research engineer at a leading US Postgraduate School in the aero department, the above statement doesn't seem to help my understanding. With further preamble, there's a ton of battery packs of every size imaginable in the department next door that does...
  17. W

    GNG, 1000W 48V BB-drive, $400

    yeah, search the thread, I think it was Dv8 ran 36v to down tune the ride cadence. Any sparky EE types care to comment on the 36v question .. stock controller is reported to LV cutout at 36v, so alternate controller was used (again search this thread). My question is - the 72v at just over...
  18. W

    GNG, 1000W 48V BB-drive, $400

    Cyclebutt : Throttle - Yea, mine too - throttle cable 'out' was right at the click shifter. So, I rotated throttle upside down then fwd about 10 deg. Looks freaky odd, but feels fine; right now bigger tasks, when get a chance gonna swap to a plain circular grip throttle. GNG Controller -...
  19. W

    GNG, 1000W 48V BB-drive, $400

    This E.S. thread has been really helpful for my build, perhaps the following notes & photos will help other’s by giving ideas & some metrics.. I was surprised to hear Lyen sensorless works OK, very cool, which model of his controller specifically was that? I just finished bench test of a 3rd...
  20. W

    Hobby King LiFePo4

    Can't find a better place for this rack & pannier bag, so will shove it here - A wave sailing friend runs a sail loft for small boats, windsurfers, and kitesurfers. The battery bag carries either 2, 3, or 4 '12 v 8400 Bricks' per side and ride suspended inside the pannier. That keeps them...
  21. W

    Hobby King LiFePo4

    Hey, I'm no expert, but if someone has metrics to share with data - love to see it. Here's a couple experiments with these packs, what I'm doing is varying the configuration because frankly don't know what pack I want with my bike's drive system. So I am changing it up a bit, maybe go to a...
  22. W

    Minimum specs for precharge switch?

    From this thread, thanks BTW, I added a slight twist. I was planning to use a 40a relay, and went ahead and added the precharge with a momentary pushbutton. My switches are weatherproof enclosed, and using a relay, I'm not directly switching the mains. So, No Zap. Frankly, don't like the...
  23. W

    GNG, 1000W 48V BB-drive, $400

    Mech dude - I run a LFP LiFeP04 Hobby King (HK) pack without BMS, and use the following. Cheap, works great. Certainly will work with Li-Ion, also, the low volt alarm is programmable to level. There are writeups and reviews for the products at the link. Cheap cell meter with loud alarm...
  24. W

    GNG, 1000W 48V BB-drive, $400

    Regarding 'skipping' I had a GNG controller which was flaky & acted very similar; it would stutter & not start at all sometimes. The above scenario could be a electrnx, do you have another controller that you can swap out? with round trip ship costs, you could likely buy one as a spare for...
  25. W

    GNG, 1000W 48V BB-drive, $400

    I've ordered several small components (wiring connectors, brushed controller) from those guys, and stateside they ship instantly. Usually I get packages in 2 days - they're west coast N. California - so, it would be international ship to Sweden. The small pulley doesn't seem to have a...
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