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  1. P

    My RC Mid Drive with Single Stage Reduction

    Nothing more yet, rock solid so far Since it's starting to rain more frequently I will likely install the enclosures soon to make it water proof, else too many days I don't ride by fear of getting caught in a storm I'm also considering doing a version that drives directly the rear wheel with...
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    My RC Mid Drive with Single Stage Reduction

    Long overdue update but a new version, motor moved from the rear of the seat to under the frame so that the flexing of the spindle doesn't change chain length significantly, works flawlessly I have enclosures printed and ready to the VESC but since I'm at the dry season I haven't bothered yet...
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    My RC Mid Drive with Single Stage Reduction

    Finally after a long time it’s rideable, first test went really well, it was just a short ride around the block since it is late First thing that needs to change is the controls, right now it’s the same as my friction drive, 1 button press 25% torque, 2 50% and 3 100%. Right now it’s really...
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    My RC Mid Drive with Single Stage Reduction

    It doesn't look that bad being huge, I may paint it black to mask a bit Screwed up a bit on the motor mount design, it cover the rear shifter cable mount, a bit of dremeling may solve that, in the future I probably will do a new mount in front of the pedal, I avoided that because the downtube...
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    My RC Mid Drive with Single Stage Reduction

    Nice to hear that Yeah, the VESC firmware has a problem with tracking at low duty cycles, on low power builds or/and ones that use a non optimal gearing it gets really apparent I plan to play with that, instead of dropping the Kv, lowering the voltage may also work since you would increase...
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    My RC Mid Drive with Single Stage Reduction

    This is actually a good idea, I will think about for a while Probably the slack side would have to have a pre load, if we could measure hpw that pre load changes, a pedal torque value may be calculated from it
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    My RC Mid Drive with Single Stage Reduction

    Thanks, they are custom laser cut, there is a shop in my city that does this kind off service ridiculously cheap, if I were to convert to dollar, all these parts, minus the chain, would be $26 Shiny ones 304 stainless, and black ones carbon steel, in case the stainless ones wear too fast I...
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    My RC Mid Drive with Single Stage Reduction

    Inspired from all of you guys, I've started working on my own The previous version was a friction drive, but it didn't work that well and for some reason I blew a lot of tires with it
  9. P

    Custom frame for the Cyclone Coaxial motor

    I've been silently following this build for a while If there is a dream bike for me, is someday building a similar frame as that, can't wait to see the results Well done Chambers
  10. P

    Li-ion cells cycle ageing

    Didn't, but it's $170, no deal, but shipping of anything is ridiculously expensive to get it here, I'm not on the US
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    Li-ion cells cycle ageing

    Thanks, it's not that bad If this is to be trusted can be had by around $150...
  12. P

    Li-ion cells cycle ageing

    Padja, do you recommend a tester that can do more than 5 A charging and doesn't break the bank? I want to play with fast charging profiles and thermal control in the future
  13. P

    Motor Analysis Sotfware

    I'm using MotorAnalysis, free and powerful, more intuitive than FEMM https://motoranalysis.com/
  14. P

    Shamrock, 25 foot sailboat electric conversion with an ebike hub motor

    Awesome project Justin, good luck on it If I heard it right do you plan to also put some solar panels?
  15. P

    Can charging my bike be made easier?

    Good point The thing that I would do is never connect the chargers in parallel first because of small differences in voltage Connect first one to the pack and then the second I want to try that for a long time, if I do will post here
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    Can charging my bike be made easier?

    Isn't most chargers already isolated? I never tested, but the ones I've disassembled the PCB was clearly isolated, with just the transformer and an optocouple bridging mains and DC side
  17. P

    Can charging my bike be made easier?

    I would parallel all charge plugs and plug both chargers in parallel there
  18. P

    Virtual Motor Dyno - Efficiency maps for any motor

    Hi everyone This is a project that I've been wanting to do for a long time, a virtual motor dyno that from just a few measurements enables us to plot efficiency map, total losses, copper losses, core losses and output power I made this intended for smaller motors for electric skateboards, but...
  19. P

    VESC 6, astroflight 3215, loosing sync with freewheel

    Glad it's solved, the duty cycle mode on the VESC behaves completely different than what most people are used to on other ESCs
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    VESC 6, astroflight 3215, loosing sync with freewheel

    You shouldn't use duty cycle mode on VESC since it doesn't have free wheel, when you release the throttle it starts to brake since the duty cycle you want is now 0% Try using current no reverse with brake
  21. P

    Fast Charging - What is the secret?

    Oh yeah, I miss read it. The heat generation from the cells is actually pretty big. on the 250 kW charging, each cells produces between 10 W and 15 W of heat loss, I guess since the time it stays at that high power level is short enough that the thermal inertia and the cooling does a good job...
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    Fast Charging - What is the secret?

    Agree with everything, it's a matter of finding a optimum compromise And the no temperature rise I disagree, if a hot battery has faster reactions, and the consequence is that it allows faster charging, maybe it's good that when charging, even at lower rates, making it hot improves cycle and...
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    Fast Charging - What is the secret?

    This would be figured out with the testing, from what I've been reading it depends, each cell is different and you absolutely can't use findings from one cell in another It's not just temperature, but the big problem is lithium plating, I'm talking now without any good understanding of what is...
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    Fast Charging - What is the secret?

    I wouldn't say impossible, but definitely a huge engineering feat, doable. Oh, and also expensive to make a one off, it will be a significantly percentage of the pack cost I've been digging a bit on a bunch of papers, lots of cool methods to build a charge curve that doesn't affect cycle life...
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    Tesla Battery Day

    This guy has been doing an awesome research on everything that could be incorporated into the new cells https://www.youtube.com/watch?v=T5Y0GAVWnE4 https://www.youtube.com/watch?v=Vt1XO5_xHss
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