Search found 191 matches

by Addy
Mar 18 2019 1:25pm
Forum: Battery Technology
Topic: Sony VTC6 - a 3000mAh/30A monster in 18650 size
Replies: 16
Views: 546

Re: Sony VTC6 - a 3000mAh/30A monster in 18650 size

john61ct wrote:
Mar 18 2019 11:59am
Personally I think even a 3V cutoff would be destructive.
Here's a link to the datasheet: https://keeppower.com.ua/download/01-20 ... mation.pdf

What makes you think that 3V cutoff would be destructive?
by Addy
Jan 29 2019 2:58pm
Forum: E-Bike General Discussion
Topic: VESC ADC input help
Replies: 7
Views: 193

Re: VESC ADC input help

VESC_ADCs.gif Here is a rendering of the VESC 4.12 PCB with the ADC inputs marked. For my ebike I have the throttle signal connected to ADC. I have a variable regen signal connected to ADC2. Your throttle/regen devices should have 3 wires each: Power Signal Ground Power wires should connect to one ...
by Addy
Jan 29 2019 12:18pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 169
Views: 5915

Re: Cheap VESC (VESC 4.12 redesign)

Nothing I did resolved the "ghost current" and the minute amount of duty cycle percentage that was being displayed. I found out that this seems like normal behavior of an idle VESC after viewing the video from the link below and other screen shots of people's VESC real time data. Real time data at ...
by Addy
Jan 25 2019 1:05pm
Forum: Battery Technology
Topic: 150 Watt load tester
Replies: 9
Views: 349

Re: 150 Watt load tester

I bought one of these on ebay and ended up with a counterfeit unit. The voltage and current measurements were inaccurate to the point where it's useless as a tester for me. The counterfeit unit also has different software that doesn't allow calibration, I believe the original units can be calibrated...
by Addy
Dec 19 2018 7:31pm
Forum: Stand-up E-scooters and E-skateboards
Topic: VESC suitable for a heavy person
Replies: 4
Views: 265

Re: VESC suitable for a heavy person

I don't think you would damage the VESC as long as you set up the current and temperature limits. I use a VESC 4.12 on my vector ebike. I use a 12s lipo battery and I limit battery current to 60A, phase current to 110A. Since my VESC is installed inside my frame, I have a small PC fan pointed at it ...
by Addy
Dec 17 2018 4:38pm
Forum: Battery Technology
Topic: 3D Printed Cell Holders
Replies: 8
Views: 461

Re: 3D Printed Cell Holders

Nice work, but I'd recommend a holder form which does not require soldering, at least on the negative pole of the battery. Check out some bus-bar / single cell fuses / large patches layouts around here. The examples I posted use soldered connections, but the script can generate holders for bus-bar ...
by Addy
Dec 17 2018 4:31pm
Forum: Battery Technology
Topic: 3D Printed Cell Holders
Replies: 8
Views: 461

Re: 3D Printed Cell Holders

Thanks for posting this, it's awesome! I could trim away the parts I don't need, in order to make any shape I wanted... I'm glad you like it. As for trimming away parts, that's probably not necessary. You can adjust the parameters in the script to make cell-holders for single cells or up to as many...
by Addy
Dec 17 2018 1:00pm
Forum: Battery Technology
Topic: 3D Printed Cell Holders
Replies: 8
Views: 461

3D Printed Cell Holders

Hex-Cell-Holder A parametric OpenSCAD project to generate STLs models of hexagonal lithium cell holders, boxes, and caps to be 3d printed. giphy[1].gif O8yBjoj.jpg ffPChFY[1].jpg I0l7Nm4.jpg kKj4PKd.jpg How does it work? Hex-Cell-Holder uses OpenSCAD to create solid 3D CAD objects. Openscad allows ...
by Addy
Dec 12 2018 7:02pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 169
Views: 5915

Re: Cheap VESC (VESC 4.12 redesign)

How many? You need to stamp the 2mm cap to create a tiny channel for the o ring, about 0.6-1mm deep. For 2pc, you can use a dremel. Than its just a matter of finding he right sized nitrile o ring. Thanks for the suggestion. I have 20 of these cases, so I won't be able to dremel them all. I'm thinki...
by Addy
Dec 11 2018 7:25pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 169
Views: 5915

Re: Cheap VESC (VESC 4.12 redesign)

Awesome. 12FET should be the ultimate goal. This could become the ultimate controller for us fairly easily, if the design can scale to 100A capability. Bonus points if you can crank up the peak voltage handling to 96V. Don't get stuck on the TO-200 package though unless you have determined that the...
by Addy
Dec 11 2018 3:38pm
Forum: E-Vehicles General Discussion
Topic: Cheap FOCer (VESC 4.12 based design)
Replies: 169
Views: 5915

Re: Cheap VESC (VESC 4.12 redesign)

Awesome - count me in for testing. I always wanted to try VESC with regen on an ebike. Drilling new holes is not a problem. What might be is proper sealing. Never seen a KT-style controller stay completely dry. Once you have finalized the size, I can help you find o-ring sealed side caps for the al...
by Addy
Dec 03 2018 2:18pm
Forum: Items Wanted
Topic: Fork Fenders DNM USD-8 upside down
Replies: 3
Views: 317

Re: Fork Fenders DNM USD-8 upside down

I have the USD-8A fork and I also need these parts. They were included with the fork when I bought it, but I broke one of them and it seems there is no glue that will hold it back together. I emailed DNM asking where I could buy these parts (dnm@dnmshock.com) They told me they charge $12 USD per set...
by Addy
Nov 28 2018 4:06pm
Forum: E-Bike General Discussion
Topic: Developing something like cycle analyst but for controllers running VESC software
Replies: 4
Views: 269

Re: Developing something like cycle analyst but for controllers running VESC software

I'm also interested in a VESC compatible display. I am considering developing my own display, but my focus right now is on my custom VESC hardware, so I am not able to work on the display development yet. Your idea is interesting. If you plan to interface with a dashcam I can understand why you want...
by Addy
Nov 26 2018 9:39pm
Forum: Items for Sale - New
Topic: Professional ESC base on VESC introduction
Replies: 61
Views: 3415

Re: Professional ESC base on VESC introduction

Is there anyone, benjamin vedder or other company, developing a 100 v model? I am using 4.2 on ebike and it is superb, but I miss a 75 v PCB to operate my cyclone motor I'm working on a 12F VESC-compatible that can run up to 80V. It will use 100V mosfets, but the current sensors are limited to 80V....
by Addy
Nov 25 2018 11:59pm
Forum: Items for Sale - New
Topic: Professional ESC base on VESC introduction
Replies: 61
Views: 3415

Re: Professional ESC base on VESC introduction

Is there anyone, benjamin vedder or other company, developing a 100 v model? I am using 4.2 on ebike and it is superb, but I miss a 75 v PCB to operate my cyclone motor I'm working on a 12F VESC-compatible that can run up to 80V. It will use 100V mosfets, but the current sensors are limited to 80V....
by Addy
Oct 23 2018 1:22pm
Forum: General Discussion
Topic: 5-120V DC to 5V component for my circuit?
Replies: 8
Views: 507

Re: 5-120V DC to 5V component for my circuit?

Experiment with some USB chargers. I have one that works fine down to 15V input.
by Addy
Oct 15 2018 11:31am
Forum: General Discussion
Topic: How to build an adjustable current dummy load?
Replies: 22
Views: 845

Re: How to build an adjustable current dummy load?

Take a look at this thread: https://endless-sphere.com/forums/viewtopic.php?p=1418180 The circuit there is one way to do what you're asking. I used a variation of that circuit years ago to make a variable load for testing batteries. In my implementation I used a microcontroller to control the load a...
by Addy
Oct 12 2018 11:57am
Forum: Battery Technology
Topic: DIY ajustable current source : test cell fuse wire
Replies: 18
Views: 716

Re: DIY ajustable current source : test cell fuse wire

Hi Addy, Thank you !! My knowledge in electronics is quite limited, so I am very grateful for you help (not only you but all of you)! Would you have suggestions for the FET ? I have found some 200A capable FETs in DirectFET package : https://www.mouser.fr/ProductDetail/Infineon-IR/IRF7749L1TRPBF?qs...
by Addy
Oct 11 2018 10:07am
Forum: Battery Technology
Topic: DIY ajustable current source : test cell fuse wire
Replies: 18
Views: 716

Re: DIY ajustable current source : test cell fuse wire

Here's a circuit that would work for providing a regulated current: http://www.learningaboutelectronics.com/images/Current-source-circuit.png For this, you apply an adjustable voltage to the non-inverting input of the opamp. The opamp will try to keep the voltage on the sense resistor the same, so b...
by Addy
Sep 29 2018 1:19pm
Forum: E-Bike Build Threads / Photos & Video
Topic: 3d printed multiple reduction rear RC drive
Replies: 4
Views: 512

Re: 3d printed multiple reduction rear RC drive

I saw this earlier and thought this was kind of an odd design because the motors vents end up being covered. If you're going to use 2 motors to get more power, it seems counterproductive to make them worse at cooling. If you look at that guy's youtube channel, he's done a version 4 of his ebike desi...
by Addy
Sep 27 2018 4:52pm
Forum: General Discussion
Topic: How to figure power dissipation of this shunt?
Replies: 10
Views: 490

Re: How to figure power dissipation of this shunt?

The regulator that you linked is not a linear regulator, although it is made by the "Linear" company so that can be confusing. It's a switching converter, so it's much more efficient than a linear type. Check out the "POWER LOSS" curves on the first page. For 5V @ 300mA output, with an input of 140...
by Addy
Sep 27 2018 1:57pm
Forum: General Discussion
Topic: How to figure power dissipation of this shunt?
Replies: 10
Views: 490

Re: How to figure power dissipation of this shunt?

Oh sorry, I mixed the question about the current sensor with the one about the linear regulator. The linear regulator is rated 140V 400mA which means that at lets say 120V input while the circuit is consuming 5V there is 115V time let's say 300mA consumption which ends up to be 34.5W which is an in...
by Addy
Sep 18 2018 5:16pm
Forum: Battery Technology
Topic: Cell level fuses?
Replies: 12
Views: 448

Re: Cell level fuses?

You'd have to select an appropriate wire gauge for the fuses. 120A out of an 8P pack would be 15A per cell, so your fuse wire should be able to pass 15A comfortably. You should also consider how much resistance the fuse wire will add to each cell. If your fuse wire gets hot under normal use, that h...
by Addy
Sep 18 2018 3:53pm
Forum: Battery Technology
Topic: Cell level fuses?
Replies: 12
Views: 448

Re: Cell level fuses?

You'd have to select an appropriate wire gauge for the fuses. 120A out of an 8P pack would be 15A per cell, so your fuse wire should be able to pass 15A comfortably. You should also consider how much resistance the fuse wire will add to each cell. If your fuse wire gets hot under normal use, that he...
by Addy
Sep 18 2018 12:59pm
Forum: Battery Technology
Topic: Cell level fuses?
Replies: 12
Views: 448

Re: Cell level fuses?

Yeah, if the cell is only slightly damaged, it could just slowly drain the parallel group. fuses.jpg I use a bus bar on the whole first and last parallel groups and solder the main wires to the busbar for even current distribution. It seems to not make sense since the busbar is a thick copper piece ...