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  1. dm9876

    Aussie 200 Watt Limit Thread

    I think we can all agree that the current regulations on ebikes are not helpful for anyone or anything, however nothing will change without well backed, organised and sustained lobbying. Clearly after nearly 1000 posts in this thread none of us fit the bill to make it happen. I think the change...
  2. dm9876

    The Cycle Satiator, universal charger for the enthusiasts

    OLED display
  3. dm9876

    The Cycle Satiator, universal charger for the enthusiasts

    Given the isolated output, maybe the solution for those wanting to series up for higher voltage could be as simple as a CC-CV programmable power supply mode with nothing more than voltage and current set points, possibly an optional timeout. Of course the data on the other unit would be wrong...
  4. dm9876

    Aussie 200 Watt Limit Thread

    I do like the suggestion a few pages back of pushing for an entirely different classification. For me, any new or adjusted regulation needs to do away with power output having anything to do with it. Regulating power output is not enforceable in any practical sense. If we propose something...
  5. dm9876

    iCell...New Bluetooth / cellphone cell monitor

    Post on DIY Drones blog about the device. http://diydrones.com/profiles/blog/show?id=705844%3ABlogPost%3A1568189 Comments on there from the device developer suggests that it's using a resistive divider network. which means uneven cell drain and maybe different levels of accuracy for each cell...
  6. dm9876

    CellLog 8 hacking

    I so agree agree with you! I think the real thing that holds us back is economy of scale.. can we really integrate all of the front end for $15 per 8 cells? Plenty of people on here have done or tried to roll their own BMS, just never seems to be popular beyond a few or the cost is very high...
  7. dm9876

    Protean has a production ready hub motor for cars

    yeah, seems like a good idea but unsprung mass issues would kill the handling. a few years back these ones sounded promising but seemed to go no where. Not sure if the 3Ph AC axial flux induction approach would be less weight or what? they also quoted similar power figures, but after some...
  8. dm9876

    The psychology of why cyclists enrage car drivers

    http://www.bbc.com/future/story/20130212-why-you-really-hate-cyclists likely similar reasons of cyclists feelings toward ebikers. Dean
  9. dm9876

    Building a Battery that will NOT cause you to wake up dead

    Re: My earlier statement about ABS vs polycarbonate cases. I found some data here: http://www.tcforensic.com.au/docs/article10.html (Celcius) ABS: melt range 88°-125°, ignition 416° Polycarbonate: melt range 140°-150°, ignition 580° Also found there are polycarbonate cases available from...
  10. dm9876

    Building a Battery that will NOT cause you to wake up dead

    I too am interested in this approach. I was looking at building a pack using these 'pelican' style hard cases, they would provide impact protection as well. http://www.jaycar.com.au/productView.asp?ID=HB6381 My concerns with this approach are that sealing it up is also insulating it and the...
  11. dm9876

    Building a Battery that will NOT cause you to wake up dead

    That nfpa article is an excellent reference. (someone posted it earlier in this thread as well) I think that we are discussing interesting things, but there is no one answer. 'safe' chemistries. quality of products etc are all relative anyway. Different choices are appropriate for different...
  12. dm9876

    Building a Battery that will NOT cause you to wake up dead

    what about polyfuse's (PPTC) in the balance wires (parallel cell connections)? Dean
  13. dm9876

    Raspberry-pi

    @TheBeastie, that's the sort of platform I was planning to use, mainly due to built in Wi-fi etc. Yeah I forgot to mention that the RP, while more powerful than an Arduino is weak by PC standards. Those USB form factor Android pc's are much better. You should note that the MK808 while dual core...
  14. dm9876

    Cheap programmable bms

    I was thinking along the line of the Celllog8's funky power supply arrangements to the differential amps ref: http://www.endless-sphere.com/forums/viewtopic.php?f=14&t=20142 Maybe it is not trying to be so flexible and is clearly intended for permanent connection. Still, it's not something...
  15. dm9876

    Raspberry-pi

    Raspberry-Pi (RP) has some general purpose I/O but not like Arduino (no analog inputs if I recall)... but it is orders of magnitude more powerful and runs Linux (compiled for ARM cpu architecture so not 100% of Linux stuff can be re purposed here, since most is compiled for x86 architecture and...
  16. dm9876

    Cheap programmable bms

    So does anyone know what is the quiescent current of this thing and is it balanced across all cells? Or is this thing active 100% of the time and will balance as the quiescent drain occurs (which would then be somewhat higher). Oh the irony if a cell balancing BMS, unbalanced a pack sitting...
  17. dm9876

    low KV motor 1.5KW, cheap and waterproof

    And thanks also for that emetor link which proves to me that I know next to nothing about any of this stuff! Dean
  18. dm9876

    low KV motor 1.5KW, cheap and waterproof

    I did end up finding some good stuff on the topic http://www.magnelab.com/uploads/4c51d9ba6fe5a.pdf page six shows some simulations with the different motor and commutation combinations.
  19. dm9876

    low KV motor 1.5KW, cheap and waterproof

    I did not know that, I guess as well as the pictures showing the windings crossing multiple stator teeth and overlapping... I figured it was implied by this actually being a 3phase generator. good to know! I guess I was over thinking it :-) Dean
  20. dm9876

    low KV motor 1.5KW, cheap and waterproof

    I think Miles alluded to the windings in an earlier post... but no one has raised the issue how to drive this thing... the windings are sinusoidal and so normally requiring sine wave commutation, not our usual 6-step block commutation. I don't really know the full implications of the mismatch...
  21. dm9876

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

    Hi Craigh85, looking forward to more feedback on this GNG system! Nice bike... and just a thought on your installation so it's not damaged. I note the hose clamp is out of alignment due to the frame design.. Possible improvement would be to make up a small plate and bolt in onto the motor frame...
  22. dm9876

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

    yeah I guess I'm just being a snob for quality gear... rather use existing components rather than replace with some unknown. Probably I should be more concerned about the freewheel than the bottom bracket... not peddling so much after install anyway :-) Dean
  23. dm9876

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

    These things look great! I was previously thinking about a similar approach to mount a cyclone kit i.e. some sort of mount around the bottom bracket. (Their standard mounting kit is so ugly!) Some questions and thoughts: Presuming standard 68mm bottom bracket length? With this format motor...
  24. dm9876

    One KiloWatt 18S Bulk Charger

    more ideas.... can't help it once I start thinking. I can't recall if you mentioned and I couldn't see from your layout which uC you were going for, but with the comments on Arduino compatible and headers for USB / serial converters, I presume the standard atmega328 from an Arduino UNO? Have...
  25. dm9876

    One KiloWatt 18S Bulk Charger

    Hi Alan, thanks. I kind of forgot that is was so obvious... "1 post" :-) I have been lurking around on and off here for a few years, yours and many other names familiar in all these electronics development threads :-) re your point on high voltage regulation, I did think of it also after my...
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