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  1. chaka

    NEW Sanyo NCR20700B 4250mah

    The most I can fit on a 33inch wheelbase in my current eboard design is 60 18650 cells in a 10s6p configuration. Max Ah using hg2 cells is 18 Ah @36v. I can fit 60 NCR20700b cells within a 33inch wheelbase which gives me 24Ah @ 36v. At 5 amp per cell they also outperform everything in the 18650...
  2. chaka

    Direct VESC V4.12

    For us space is always an issue since we integrate everything into a cavity only 20mm deep and our electronics need to fit into a cavity around 50mm wide so v4.12 is a good fit. Once v6 goes public we will likely rework the pcb files and make a more compact version to suit our needs but it will...
  3. chaka

    Direct VESC V4.12

    Kapton might not be the best material. I use it to insulate plastic jst headers when reworking circuit boards. Better to use something like this: https://www.amazon.com/dp/B019MV1TAC/ref=psdc_2998409011_t1_B019MU7NTO All that is really needed to assemble these is a smd station with a hot air...
  4. chaka

    Direct VESC V4.12

    We place them here in the shop and send them through our reflow oven. The direct fets were easier than expected to place.
  5. chaka

    Direct VESC V4.12

    Yeah, you need to use a thermal adhesive to attach a heat sinks and keep them electrically insulated from the package. This is still very much in the alpha phase and I may make a few more changes before moving into manufacturing these.
  6. chaka

    Direct VESC V4.12

    It has been awhile since posting on the sphere but I think there are some members here who will find this new project useful. We have modified the original Kicad files for V4.12 and switched to direct fets for proper cooling with heat sinks. The modified files have been uploaded to our OshPark...
  7. chaka

    VESC Capacitor Fell out.. What?!

    PM sent! If they gouge you on shipping let me know.
  8. chaka

    VESC Capacitor Fell out.. What?!

    Hey Montiey, That looks like one of mine! If it is send me an email with your info and I will send you a replacement cap.
  9. chaka

    18650 cell level fuse holder

    Here's the link to the .stl files for the 18650 cell holders used in our electric skateboards: http://www.thingiverse.com/thing:1712459 I've received a bunch of requests for other combinations so I will update the page with those as I make them. Will probably include more information on how the...
  10. chaka

    How To Solder Your Own VESC!

    If you were able to load the firmware but get no response when powered you probably have some bridged pins. Check the usb, stm and the drv. I use a 10x loupe to check for solder hairs. If that fails you may need to reflow the drv chip and make sure it is soldered to the ground pad as that will...
  11. chaka

    VESC Doesn't respond when battery cells get to 3.9V

    Return it to default.
  12. chaka

    VESC Doesn't respond when battery cells get to 3.9V

    What chemistry are you using? Is it lifepo?
  13. chaka

    [ON HOLD] VESC stopped working..

    No worries, just get it to us and we will take care of the rest. Ollin Board Company PO Box 3391 Truth or Consequences, NM 87901 USA
  14. chaka

    [ON HOLD] VESC stopped working..

    Send it in Montiey! Do me a favor and save your xml file for your motor configuration and send it to me in an email. It may help to find the cause of the failure. You can reach me @ jclark@ollinboardcompany.com
  15. chaka

    VESC Doesn't respond when battery cells get to 3.9V

    Show us a screen shot of your motor settings. Might be a simple fix or could you possibly be running a 3s battery?
  16. chaka

    8S LiFePO4 on a 6S LiPo ESC a good idea?

    I have done this on an ezrun esc but you have to limit charge voltage to 28 volts. I am not sure about the ESC you are using, it may not work?
  17. chaka

    DIY Trampa long 35 E-MTB | Dual VESC | Sensored EMAX GT5345

    Thinking about it know and I recall the VESC uses a 10k thermistor for the fets so it should work fine.
  18. chaka

    DIY Trampa long 35 E-MTB | Dual VESC | Sensored EMAX GT5345

    I'm not sure about the thermistor, I haven't attempted adding that to a motor yet.
  19. chaka

    DIY Trampa long 35 E-MTB | Dual VESC | Sensored EMAX GT5345

    Sweet build! Watch it with those hex bolts between the solder pads. Switch them out for some nylon hardware to be safe.
  20. chaka

    10S custom skate ESC: testers wanted!

    Vedder is a great person, his work, and views on opensource, are a shining example of how bright the future of the world can actually be. He has my dedicated support!
  21. chaka

    So I bought a lathe...and made Hub Motors

    I wonder if you could lace some braided cable through what is left of the abec core spokes to keep the urethane from succumbing to the centrifugal force?
  22. chaka

    Reverse PPM

    You can calibrate the vesc by adjusting the min and max pulsewidth in the ppm menu. Next to the realtime display you will see a box showing your pulsewidth (ms). Take note of the value when the transmitter is at full brake and enter that as your minimum pulsewidth, do the same for throttle max...
  23. chaka

    Why do Li-ion Batteries die? How to improve the situation?

    I found this video last year. Lots of great information on li-ion battery tech and how to design long lasting battery packs. pxP0Cu00sZs
  24. chaka

    When to use low voltage - VESC Configuration

    So far I have had two or three people kill their VESC by using a lab power supply. If you know what you are doing and you have a decent unit by all means use it. If you are new to the sport and in a rush to get going just use a low voltage battery around 12v. The main reason to use low voltage...
  25. chaka

    When to use low voltage - VESC Configuration

    I see many people fret about using a low voltage power supply to configure their VESC. This is a good idea but it is not always necessary. The only time I would say it is absolutely necessary is when powering up a VESC for the very first time, if you buy them from me you can count on this...
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