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  1. jbond

    Rear hub motor choice

    No question. Just clarification of where I was coming from with the original query. And thanks for your input. It does sound like the Q100 is going to do the job.
  2. jbond

    Rear hub motor choice

    My current ride is an Alien Aurora with a 36v350w BPM and a 36v15AHr LiNMC rack battery. I'm trying to put a bike together with about the same performance but lighter and neater with a better basic bicycle. The Aurora is a rigid MTB style, 26" wheels but low quality. I'm in the UK.
  3. jbond

    Rear hub motor choice

    Decisions. Decisons. Which would make a better base for a stealth 48v-15A rear drive motor on a bike with mechanical 160mm disks and Shimano Acera 9sp rear mech? The Cute/QBK 10 CST using the existing 9 speed cassette, or the Bafang/8Fun SWXH with a DND 9sp freewheel. The Cute has a LHS cable...
  4. jbond

    BMSBattery/ECityPower Experience

    If not BMS, then who? Is there a reliable and sensibly priced alternative for things like Bafang hubs either in Europe or that ships reliably to Europe?
  5. jbond

    Bafang Bpm, how many RPM?

    Another data point. I have a BPM marked 36v350w 26(11) which I take to be a code 11 designed for a 26" wheel. I've measured a no-load speed of 23.5mph (cycle computer calibrated against GPS). Typical flat out top speed is about ~20mph. Working all that back gives a no load rpm of 308 on a...
  6. jbond

    Commuter Booster - <1kg Friction Drive

    The temptation to keep the code to yourself is going to be strong. But I'd really urge you to think carefully about open sourcing the code and what that would mean. I haven't done the research, but I don't see any problem with the legality of selling a packaged hardware-software solution that is...
  7. jbond

    Bafang 393RPM Hill Capability

    Some real world experience. I've got a packaged bike that uses the sensorless BPM 36v350w 26"(11) motor, with 36v-10AHr of Phylion LiMnO2 battery and an LSDSZ controller marked as 9A continuous, 18A peak. Noload speed is 24mph. Real world flat speed is 20mph. The worst off road hill I could...
  8. jbond

    Commuter Booster - <1kg Friction Drive

    As I understand it, two things break controller FETs. Too much current at 100% PWM, and current spikes at low rpm, mid-throttle, mid-PWM. Low rpm means there's not enough back EMF to limit the voltage, and even if battery current is limited, the peak current during the PWM on phase can be too...
  9. jbond

    Commuter Booster - <1kg Friction Drive

    Are going to try to limit phase currents as well as battery current and do you think you might need to? As I understand it the Infineon controllers don't directly limit phase current, but calculate what the phase current would probably be based on PWM, motor speed and battery current. This is...
  10. jbond

    EU is trying to kill the ebike!!!

    Is it? Maybe. Perhaps. We seem to have some mishmash at the moment with the exact state of the law being a bit undefined. 250w, 25kmph, but throttle only allowed. So current EU law overlaid on the old UK law with the legislation out of step with what's accepted as allowed to be sold and used.
  11. jbond

    EU is trying to kill the ebike!!!

    Ok. I've misunderstood what everyone was arguing for. Seems we have several things going on here. - Cycling organisations wanting limited regulation to be restricted to 25kmph 250w bicycles and not widened. - EU wanting to extend motorcycle TUV (and by implication Electric motorcycles) to...
  12. jbond

    Lightweight bike project

    I don't believe anyone makes a rear motor with a cassette for the gears. They all take a freewheel. And freewheels are pretty much limited to 7 speed. On "too much is never enough". This is from scanning the forums for a while rather than personal experience. If you're serious about light...
  13. jbond

    How to Solar Charge an Electric Bicycle

    I'd agree that putting cells on the bike makes no sense unless you have a very specific need, like a round the world trip or something. If you have a boring (!), standard 36v or 48v E-Bike with the typical Li-On battery and charger, then I think plumbing direct into a spare charger makes a...
  14. jbond

    How to Solar Charge an Electric Bicycle

    OK. tell me why it won't work. Then go and look at this. http://endless-sphere.com/forums/viewtopic.php?f=6&t=13091&p=193922&hilit=solarbike#p193922
  15. jbond

    How to Solar Charge an Electric Bicycle

    Another option. Get 3 12v trickle chargers designed for a car. Wire them in series to get ~36v. Then get a spare 36v battery charger for your 36v E-Bike. Open it up and apply the solar 36v out to the rectified side of the 4 diode rectifier on the 240v input side of the charger.
  16. jbond

    Commuter Booster - <1kg Friction Drive

    I think you missed this one posted once before on this thread. http://www.recumbents.com/wisil/tetz/TransientSpikeReduction/default.htm I like the way this is a very simple analogue current limiter, just pulling down the throttle input when the current goes too high in much the same way the CA...
  17. jbond

    EU is trying to kill the ebike!!!

    You've got to separate out the arguments about Electric Bicycles (25KMPH, 250w) and Electric light motorcycles. As far as I can tell none of the articles mentioned are arguing for changes to the E-Bicycle law. The changes are a side effect of the motorcycle laws. Rightly or wrongly, the EU is...
  18. jbond

    Henry111's free tech support thread

    Just to further confuse, BMSBattery have started selling Headway based High C LiFePo packs with a choice of BMS in 20A-60A-100A ratings. High C, High LifeTime, Safe but with LiFePo's weight. Every so often they also sell the latest ECityPower LiNiCoMn packs. They're quite a bit lighter and...
  19. jbond

    Henry111's free tech support thread

    Quite. There's a holy grail in here somewhere. A battery pack with the light weight and high C rating of RC Lipo, the lifespan of LiFePo and the simplicity, safety and ease of use of the typical LiMn E-Bike battery. And then available in 3 styles; very lightweight, short distance commute; Big...
  20. jbond

    Apology to Lyen ...(sensorless controller)

    Bafang run their baby and BPM geared, freewheel motors sensorless. Why not the MAC/BMC?
  21. jbond

    250w gear motor. what amp limit not to kill the gears.

    What motors are these? Bafang QWSX perhaps, or Tongxin, or what? See http://endless-sphere.com/forums/viewtopic.php?f=3&t=20736&p=385320&hilit=butter#p385320 Several reports of 36v20A and 48v20A being fine.
  22. jbond

    Hey, this battery looks pretty cool. Anyone know about it?

    Damn battery tech won't keep still! LiNiCoMnO2 seems to be replacing LiMn as the chemistry of choice for low end batteries. It's lighter and smaller than LiFePo but with the same reduced lifetime of 1000 cycles or so compared with 2000 for LiFePo. We're also seeing this appear in high C rating...
  23. jbond

    Conhismotor 48v 10ah LiFePo4 (LiMn2O4) in aluminium case

    Did the questions about the chemistry ever get resolved? BMSBattery were briefly selling LiNiCoMn shrink wrap batteries but they've now disappeared. These seemed like a pretty good weight, volume, price, capacity, lifetime compromise. Claimed 1k cycles vs LiFePo's 2k cycles, but cheaper and 1/3...
  24. jbond

    Installing pas sensor on sprocket side...

    I'm quite curious about this. On my PAS it definitely only kicks the motor if I rotate the pedals one way, not the other. And I can get it to power the motor when reverse pedalling (not very useful !) by reversing the magnet disk on the left crank arm. So what's the orientation of the magnets...
  25. jbond

    Still searching for the holy grail

    Ah. Low power, low weight, efficient. Geared hub motors have some drag. It's unavoidable because the planetary gears, freewheel, sealed bearings are never going to be as free running as a conventional bicycle wheel. For most of us this isn't a problem because the drag is acceptably low, but if...
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