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  1. stingray17

    3-192S Arduino BMS (using BQ76PL536A)

    I'm dying to get my hands on a compact microcontroller system to allow me to monitor a 14S ebike pack. Right now I'm just going with opto-isolated alarm outputs from 2x CellLog 8M's that I can easily unplug when not in use. But I am a data hound and want to monitor everything, plus maybe...
  2. stingray17

    Trying to plan out first build

    The Ping battery at 10Ah probably does not have the discharge rate you want. The cells are rated 1C discharge. I have found that 1.5C is fine. If you are going to keep it at 15 Amps or so, no problem... although you don't really need a 9 FET controller, a 6 FET would be fine. But running at...
  3. stingray17

    Ebrake handle left or right hand side?

    I don't currently use regen, but I like to have brake cutoffs on both sides. Not just for safety, but also because I prefer the more symmetrical look of matching brake levers. Throttle cutoffs are normally-open switches, so wire in parallel. On the safety side, sure I am capable of quickly...
  4. stingray17

    How do you water cool a water cooled ESC?

    No, that controller probably does not have its own pump. And yes, that one is intended for a boat, but that is not the only way to use water cooled motor controllers. If you want to do water cooling, you could use equipment designed for a boat, but wouldn't necessarily have to. You could also...
  5. stingray17

    Help please, i think i may have a problem with my CA

    Well, not sure, but here is some stuff I would try/check if I were you: * Wheel diameter set correctly, speedo working accurately? * When you remove the magnet or sensor from the wheel, CA speedo reads 0mph (proves it's wired right and not getting a speed signal from the controller) *...
  6. stingray17

    Help: wheel spins up when I twist, then coasts off.

    This sounds like exactly what happens when the phase current or other values go out of range, and the controller shuts off the motor until releasing the throttle resets it. Probably reprogramming the controller will fix this. You might find that the phase current limit is too low and/or the...
  7. stingray17

    Solar power house info With link for cheep pricing

    Kurt, I would recommend that you do not do that on a hot day... The rapid change in temperature can easily crack/shatter the glass on the solar modules! I've seen it happen.
  8. stingray17

    Dahon Mu SL + ebikes eZee kit + ping 48V 10Ah

    I chose the eZee for my first kit because of the reputation for reliability and for support from ebikes.ca ... I put 3000 miles on that motor before selling it and never had a single problem, so I was happy with that choice. Nothing against the cheaper motors tho. I agree about the cables...
  9. stingray17

    folding bike conversion?

    All of the rear wheel hub motors I have seen are 135mm. I have put hub motors on two Dahon bikes. The Mu (I used a Mu SL) was possible but rather difficult to get the wheel in. I didn't permanently re-set the frame because with an aluminum frame I understand that is less safe. I just sprung...
  10. stingray17

    folding bike conversion?

    Dahon Speed D7 makes a great folding electric bike. Sounds like you've already picked out a motor and everything, I think it's going to work well. One thing I would recommend is that you use good lock washers AND a torque arm and make sure that wheel is sitting all the way in the dropouts...
  11. stingray17

    Adding an external speedometer to a direct plug CA

    Yes you can. The speedometer on a DPS/SA model is very simple. It consists of a reed switch attached to a cable, plus a magnet attached to your wheel. You can cannibalize an old wired bike computer to get the reed switch and magnet. Then you connect the two wires of the reed switch between...
  12. stingray17

    what kind of looks do you get from human powered cyclists?

    I don't think I've ever gotten dirty looks from human-power bicyclists here in the San Francisco Bay Area... Although maybe I was going too fast and missed it. I have gotten bemused looks, and sometimes if I'm stopped at a light and they catch me, they ask me where the motor is. Usually this...
  13. stingray17

    e bike crashes, whats your experiences

    I've had four notable crashes on my first ebike. Two of them were going through intersections where I had the right of way and got hit by a car anyhow. One time I got pretty messed up with a concussion (and broken helmet) and the bruises took months to heal. The second time, it finally got...
  14. stingray17

    throttle keeps failing

    Sounds like you may have a janky wiring harness. A damaged wire anywhere in there -- perhaps even inside a multiconductor cable, caused by kinking, repeatedly bending or crushing it -- might have the potential to fry your throttle, by momentarily exposing any of the throttle wires to +12V/-12V...
  15. stingray17

    My e-bike ruled legal in Hawaii

    Great job shiningraven, You're an ebike hero! :mrgreen:
  16. stingray17

    throttle keeps failing

    Couple of possibilities... First off this might be a dumb question, but are you sure the throttle is really getting damaged? Just want to make sure... if you turn everything off wait 5 minutes and reconnect the throttle you are getting absolutely nothing, but if you connect a different...
  17. stingray17

    could use some electrical help here, thanks...

    hey ptd, how's it going? After amberwolf's tests above the next thing I would check if I were you is the throttle... The throttle typically has three wires or maybe 4. They are: 1. Ground 2. +5V Power 3. Speed Control back from throttle to controller 4. (sometimes) battery voltage for bat...
  18. stingray17

    ANYONE KNOW WHAT RISK SOLAR FLARES POSE TO A E-BIKE

    (credit to Alan B who inspired this amazing plan in another thread.) 1. construct secure metal box 2. put spare controller, battery charger and a few hall effect sensors in box. extra shotgun shells optional. 3. bury box in the backyard 4. wait for EMP apocalypse 5. dig up box, effect repairs...
  19. stingray17

    Throttle interface for sensitive high power setups

    Yeah, you might have hit the nail on the head, John! I really like that idea of using the speed of the bike to change the throttle range & sensitivity. It could create a much safer and more fun setup for medium to high powered ebikes and it seems to me that as long as it's smooth it would be...
  20. stingray17

    Finished standard high-rate e-bike battery?

    I wouldn't recommend running a ping 10Ah pack at 20A constant on a regular basis. That was my first battery pack, and it will do it, but I found that my capacity seemed to degrade fairly quickly when drawing more than 1.5C constant. For pre-made 10 Ah packs with >20A rates, as others have said...
  21. stingray17

    Please help with Electricity Math

    For running a mobile computer, you would be better off if you can reduce your power needs at least a little bit! Might mean running only one hard drive, one video card instead of SLI team, etc. Then skip the inverter and AC power supply, and run the PC from an M4-ATX. It's a DC-DC computer...
  22. stingray17

    Correct CA Shunt calibration?

    To calibrate CA for an unknown shunt, or to fine-tune it, you can just GUESS the shunt value, then either calibrate the CA "on the bike" using an external DC energy meter (such as a Turnigy or WattsUp power analyzer), or calibrate it against a constant-current charger by running a known current...
  23. stingray17

    kmxtornado's first e-bike conversion build thread *photos*

    I will second (third, fourth?) the recommendation to get a MAC from cell_man given your needs. (Check his profile or look in the for-sale forum) BMC/Puma/eZee motors are good but too expensive, they'd blow out your budget. You could get a 10-turn or 12-turn high torque motor that would be...
  24. stingray17

    Throttle interface for sensitive high power setups

    zombiess and adrian_sm, thanks, it's so funny this thread came up just now, I just thinking this weekend of doing the exact same thing -- a little microcontroller between the throttle and the controller to re-adjust the scale and range. I'm using a similar board based on ATmega32u4 called...
  25. stingray17

    calibrating a cycleanalyst with a watt meter?

    Paul_G that's not a bad idea either. Using an external DC amp meter and tweaking the value up/down until the CA matches the meter is also a simple and direct way to do it. That would also be a good technique if you have one of those meters. However, it's not the only proper way. Using a...
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