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  1. 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...
  2. 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...
  3. 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
  4. 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...
  5. chaka

    Chaka's VESC repair log

    Now that I am servicing/repairing VESC's I thought I might keep a log of the various failures and solutions. I hope it may become useful for anyone attempting to repair a VESC on their own. I will do my best to keep this thread updated and document how I bring these beautiful pieces of hardware...
  6. chaka

    Finding a short with canned air

    I recently repaired a VESC which had been shorted through the P1 header/encoder/hall sensor port. The result was a dead vesc with a hot voltage regulator when powered on. I was short on time and my multi meter needed a new 9v battery so I resorted to less professional means of finding the...
  7. chaka

    DIY Anti-Spark Bullet Connectors.

    The picture says it all! I took a little break today while I had some VESC's in the oven and crafted this little gem. I used three 1K resistors to make it. After cutting the tip off the female connector I used the male connector as an alignment jig. I remember seeing something like this on...
  8. chaka

    Vedder's Nunchuk RF

    We have some Nunchuck-RF PCB's in fabrication, should have them a week from now. I'll do my best to document everything during assembly and create a build guide. The Nunchuck has a 2 layer PCB and is a fairly simple build, a good project for someone new to smd with intermediate soldering skills...
  9. chaka

    Modular 18650 Parallel Packs, Water Cooled Option!

    I am getting ready to offer the battery system I use in my house designs in a more modular format. I am thinking a 1s4p pack with protection circuits good to 80-90 amps might be a good size. This would make them suitable for most 6s applications and ideal for 12s systems. Balance function could...
  10. chaka

    Open Source CNC - hollow core deck

    What do you guys think about using a 3D model of blanks/uncut boards for your own personal designs/shapes? Getting really close to a finished CNC router over here and it just dawned on me that this could be a sweet diy option!
  11. chaka

    18650 Cycle Life vs Discharge/Charge Rate

    After having seen countless discussions, graphs and lectures and my own testing I have come to the conclusion that these cells, no matter what their rating, will degrade by as much as 40% after only 200 charge/discharge cycles when used in a high discharge environment. It has been shown that you...
  12. chaka

    How to Make a Battery Protection Circuit

    I'm not sure if this would work for us but I found some useful information on how I can power down any hard wired balance lead circuitry. https://www.youtube.com/watch?v=1Fs4SfVSsLk
  13. chaka

    Parallel and series connections, what comes first?

    Most of us when first staring out buy lipo packs prewired in series and simply add packs in parallel to gain more capacity. The trouble is when our packs get close to 80% depleted some of the cells lose their capacity to deliver the amps needed and you get individual cells taking a voltage dive...
  14. chaka

    Flux hollow core longboard (update!)

    Edit: This board is now for sale! Check my listing for specs and pricing https://endless-sphere.com/forums/viewtopic.php?f=31&t=73282 Two months ago I set out to create a deck for the EV community. Having a cavity depth of 21mm it is built to house 2s 4200 mAh LiFePo4 wired in either 6S2P or...
  15. chaka

    Better skate bearings for drive wheels.

    During my latest build I was faced with the inadequacy of skate bearings on the drive wheel, too much tension and it starts clicking on every revolution. So I found these...
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