Search found 186 matches

by Addy
Dec 17 2018 4:38pm
Forum: Battery Technology
Topic: 3D Printed Cell Holders
Replies: 7
Views: 153

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: 7
Views: 153

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: 7
Views: 153

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 VESC (VESC 4.12 redesign)
Replies: 29
Views: 774

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 VESC (VESC 4.12 redesign)
Replies: 29
Views: 774

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 VESC (VESC 4.12 redesign)
Replies: 29
Views: 774

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: 2
Views: 129

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: 179

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: 2779

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: 2779

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: 379

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: 633

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: 585

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: 585

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: 418

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: 392

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: 392

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: 353

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: 353

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: 353

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 ...
by Addy
Sep 18 2018 12:37pm
Forum: Battery Technology
Topic: Cell level fuses?
Replies: 12
Views: 353

Re: Cell level fuses?

In the picture you linked, it looks like the bus bar is soldered at one end, I assume this is where the series connection is made. Yes, the fuse wires are only for the parallel connections, to connect each cell to to the bus. This style of fusing gives you some protection when a single cell develops...
by Addy
Sep 11 2018 10:48am
Forum: E-Bike General Discussion
Topic: Disadvantages of higher Battery Voltage
Replies: 38
Views: 1394

Re: Disadvantages of higher Battery Voltage

Alright, either I'm taking crazy pills here, or some eminent experts in the field have replied, and have failed to noticed that to get his simulation to work, he throttle limited both bikes. Higher voltages do not cause motors to heat up faster when you're throttle limiting them. 72v @ 12% throttle...
by Addy
Aug 29 2018 12:56pm
Forum: E-Bike Technical
Topic: Open source fuse-wire test rig
Replies: 3
Views: 199

Re: Open source fuse-wire test rig

I don't think a clamp meter is accurate enough for this. Do you have multimeters that can measure current directly? If you can only measure voltage, you could put a shunt resistor in series with the fuse wire. Then you just need to measure the voltage across the shunt to calculate the current. For t...
by Addy
Aug 13 2018 10:48am
Forum: E-Bike Technical
Topic: brake light wiring for cycle analyst with mosfet as a switch
Replies: 8
Views: 250

Re: brake light wiring for cycle analyst with mosfet as a switch

Do you have access to any other mosfets? The 2N60C part you mentioned would not work well for this purpose unless your brake light uses very little power. The 2N60C is rated for 600V, much more than what's needed here. It's gate threshold voltage (voltage needed to turn it on) is 2-4V, sometimes 5V ...
by Addy
Aug 13 2018 10:18am
Forum: Items for Sale - New
Topic: Professional ESC base on VESC introduction
Replies: 61
Views: 2779

Re: Professional ESC base on VESC introduction

30% extra speed took around 200w extra. 50% takes almost 400w on the 6374 I had on my bench. Probably not very accurate numbers as this was a calculated value from duty and noisy phase current reading, not battery shunt. I did my commute today with the "automatic" field weakening. It worked quite w...