Search found 302 matches

by chaka
Apr 21, 2017 9:43 am
Forum: Battery Technology
Topic: NEW Sanyo NCR20700B 4250mah
Replies: 4
Views: 537

Re: 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 clas...
by chaka
Dec 08, 2016 4:19 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Direct VESC V4.12
Replies: 15
Views: 961

Re: 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 be m...
by chaka
Dec 08, 2016 11:10 am
Forum: Stand-up E-scooters and E-skateboards
Topic: Direct VESC V4.12
Replies: 15
Views: 961

Re: 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 attachm...
by chaka
Dec 08, 2016 2:27 am
Forum: Stand-up E-scooters and E-skateboards
Topic: Direct VESC V4.12
Replies: 15
Views: 961

Re: Direct VESC V4.12

s28400 wrote:Very nice! I look forward to seeing the thermal performance on these! Where do you get the smd placement done after you order from oshpark if you don't mind me asking?
Cheers!
We place them here in the shop and send them through our reflow oven. The direct fets were easier than expected to place.
by chaka
Dec 07, 2016 7:10 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Direct VESC V4.12
Replies: 15
Views: 961

Re: 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.
by chaka
Dec 07, 2016 1:38 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Direct VESC V4.12
Replies: 15
Views: 961

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 accou...
by chaka
Aug 19, 2016 1:50 am
Forum: Stand-up E-scooters and E-skateboards
Topic: VESC Capacitor Fell out.. What?!
Replies: 5
Views: 442

Re: VESC Capacitor Fell out.. What?!

PM sent!

If they gouge you on shipping let me know.
by chaka
Aug 18, 2016 10:20 pm
Forum: Items for Sale - New
Topic: Vedder's VESC Free US shipping!!!
Replies: 44
Views: 4044

Re: Vedder's VESC Free US shipping!!!

It has been awhile since our last post here but we have made much progress! The VESC we are producing today is much more refined with several updates to the components used in its construction. Definitely one of the most robust VESC's you can find! http://www.electric-skateboard.builders/uploads/db1...
by chaka
Aug 18, 2016 9:45 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: VESC Capacitor Fell out.. What?!
Replies: 5
Views: 442

Re: 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.
by chaka
Aug 18, 2016 1:13 am
Forum: Battery Technology
Topic: 18650 cell level fuse holder
Replies: 0
Views: 330

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 cell...
by chaka
May 24, 2016 9:32 am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To Solder Your Own VESC!
Replies: 62
Views: 9292

Re: How To Solder Your Own VESC!

I just soldered my first VESC. Bought boards at oshpark. Components at Mouser. HW 4.10. Successfully uploaded bootloader with ST-Link and "make upload" (got "verified ok" message in the terminal), then disconnected 6pin cable and connected VESC to the battery 5S LiPo (18.5V). Unfortunately it does ...
by chaka
May 10, 2016 8:50 am
Forum: Stand-up E-scooters and E-skateboards
Topic: VESC Doesn't respond when battery cells get to 3.9V
Replies: 8
Views: 390

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

What chemistry are you using? Is it lifepo?
by chaka
May 09, 2016 10:58 am
Forum: Stand-up E-scooters and E-skateboards
Topic: [ON HOLD] VESC stopped working..
Replies: 8
Views: 649

Re: [Help] VESC stopped working..

Montiey wrote:Other than the Motor config, I believe the other settings were wiped with the firmware re-flash. I'll send all the files I have.
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
by chaka
May 09, 2016 7:47 am
Forum: Stand-up E-scooters and E-skateboards
Topic: [ON HOLD] VESC stopped working..
Replies: 8
Views: 649

Re: [Help] 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
by chaka
May 05, 2016 8:06 am
Forum: Stand-up E-scooters and E-skateboards
Topic: VESC Doesn't respond when battery cells get to 3.9V
Replies: 8
Views: 390

Re: 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?
by chaka
Apr 14, 2016 12:29 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 8S LiFePO4 on a 6S LiPo ESC a good idea?
Replies: 3
Views: 421

Re: 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?
by chaka
Apr 04, 2016 5:15 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: DIY Trampa long 35 E-MTB | Dual VESC | Sensored EMAX GT5345
Replies: 66
Views: 8127

Re: DIY Trampa long 35 E-MTB | Dual VESC |

Thinking about it know and I recall the VESC uses a 10k thermistor for the fets so it should work fine.
by chaka
Apr 04, 2016 3:12 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: DIY Trampa long 35 E-MTB | Dual VESC | Sensored EMAX GT5345
Replies: 66
Views: 8127

Re: DIY Trampa long 35 E-MTB | Dual VESC |

I'm not sure about the thermistor, I haven't attempted adding that to a motor yet.
by chaka
Apr 04, 2016 11:07 am
Forum: Stand-up E-scooters and E-skateboards
Topic: DIY Trampa long 35 E-MTB | Dual VESC | Sensored EMAX GT5345
Replies: 66
Views: 8127

Re: DIY Trampa long 35 E-MTB | Dual VESC |

Sweet build! Watch it with those hex bolts between the solder pads. Switch them out for some nylon hardware to be safe.
by chaka
Apr 01, 2016 9:04 am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 151436

Re: 10S custom skate ESC: testers wanted!

I cannot believe how this ESC have exploded in the e-skateboard community. It all started 2,5 years ago when I have had a few beers and wanted to do something fun for my bachelors thesis... Benjamin was really kind and helped us making his BLDC-driver get suited for the needs we had during the proj...
by chaka
Mar 29, 2016 12:26 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: So I bought a lathe...and made Hub Motors
Replies: 306
Views: 32761

Re: 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?
by chaka
Mar 29, 2016 10:04 am
Forum: Stand-up E-scooters and E-skateboards
Topic: Reverse PPM
Replies: 7
Views: 473

Re: 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. You ...
by chaka
Mar 28, 2016 9:30 am
Forum: Stand-up E-scooters and E-skateboards
Topic: Why do Li-ion Batteries die? How to improve the situation?
Replies: 2
Views: 336

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.

by chaka
Mar 25, 2016 9:28 am
Forum: Stand-up E-scooters and E-skateboards
Topic: When to use low voltage - VESC Configuration
Replies: 4
Views: 466

Re: 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 is to...