Search found 273 matches

by tatus1969
Aug 13 2019 4:37am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

Is this "REMOVE SHORT" error cause only possible if this diode is somehow damaged (even if it looks ok)? If so, can it be easily replaced with an ordinary soldering iron? I need to order from you new electrodes, so if indeed I should replace this diode for stopping the error, maybe you can send me ...
by tatus1969
Aug 11 2019 6:45am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

If I disconnect the fuse (from the electrode side) and connect it again it stops giving "REMOVE SHORT" and it welds without problems. Any other ideas? Please do not trigger welding pulses without a replacement in place, this diode is protecting the switching MOSFETs from inductive kickback energy t...
by tatus1969
Aug 07 2019 3:49am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

I have about 50cm 4AWG pure copper cable on the input. Should i shorten them because of inductance? What is the downside of worse inductance? I'd rather not because of the size of the car battery :) What a wonderful piece of welder :) Thanks 8) I am explaining the theory behind wire inductance in d...
by tatus1969
Jul 24 2019 3:08am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

eikido wrote:
Jul 23 2019 5:04pm
why not go with 0.2mm directly?
One good reason: less thick nickel means less required energy, which means less thermal stress for the battery.
by tatus1969
Jul 23 2019 7:15am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

Will someone please be kind and explain why something like kSupply exists? Why can't i just connect an appropriate/cheap power supply up to 8.1v to the kCap? However 2s 18650 wouldn't work->4.2x2=8.4v? The main reason why I developed that module was that I realized that the welder not only requires...
by tatus1969
Jul 04 2019 12:16pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

I am currently building a pack using .2mm nickel. I have to crank the Kweld up to 125j for good welds and as a result the electrodes and their lead wires get pretty hot after just 4 spot welds and I have to let them cool off. Is this setting normal for .2mm nickel? And what about the heat in the el...
by tatus1969
Jun 17 2019 5:42am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

I did that to both green and red graphenes, and the problem is the same, usually only one out of 6 gets unsticked, but that is probably from the heat, I once put my finger on the terminal and did a weld and it got hot for a really short time If you have disassembled one of the red ones on your desk...
by tatus1969
Jun 17 2019 3:03am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

I actually bought the ones you recommended, calibrated the welder and the 2nd day of welding they broke beyond repair Which exact battery model is that? For example, I know from other customers, that the green Hobbyking Graphene cannot be recommended as the cell interconnects seem to be too weak. I...
by tatus1969
Jun 14 2019 4:32am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

I keep blowing my lipos, will i reduce the time required to make the weld by increasing their voltage? And there by reducing the heat and stress on the thin aluminum terminals Im currently at 3s and can make a 5s batters from the cells I have left that are not broken (all the same 5ah 75c panther) ...
by tatus1969
Jun 13 2019 8:32am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

How does one test the testing machine? That's actaully a very good question and worth more than a joke. That's why tester development is always an evolutionary process, you make a first attempt and run DUT's over it while a) observing it statistically and b) permanently asking for feedback from the...
by tatus1969
Jun 12 2019 4:51am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

Looking at the pivot design you have to be a engineer. :mrgreen: No way that would pass a cost focused manager :mrgreen: :lol: that's the advantage being both in persona. Although the manager in me had to struggle quite a while, because that (off the shelf) component alone was 450€. But still this ...
by tatus1969
Jun 11 2019 8:25am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

That makes me think of a prominent example of this kind (can someone tell him that it is called import duty because the importer has to pay it, and not the foreign country that sells the goods...) But I shoudln't get political here, just wanted to share this. I have recently upgraded the kWeld produ...
by tatus1969
Jun 11 2019 6:53am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

*Please download -here- the manual for your Kweld. If not setup/calibrate right you can damage your cells* Thanks, added. But doesn't help buyers who don't even read the item description at all. For example, I get quite a few questions via email whether I have a US reseller. Or customers who are su...
by tatus1969
Jun 11 2019 6:47am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

Just came back from a hiking tour with my son over the long weekend that we had here in Germany. I've collected a few important notes regarding kWeld use for the next manual revision, like don't apply external voltage to the electrodes, and a few tips for proper calibration. But this rises a questio...
by tatus1969
May 24 2019 8:38am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

BenjAZ wrote:
May 24 2019 2:43am
Congrats to the kWeld maker!!
Thanks 8)
by tatus1969
May 23 2019 6:03am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

would using a regular 500W-ish ATX PSU be a valid solution? i would really like to weld without having a plane take off on my workbench. would the PCB limit the current enough to prevent a OCP shutdown of a regular power supply? Any capable 12V supply will work, and the kSupply current limit is adj...
by tatus1969
May 21 2019 9:32am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

Headrc wrote:
May 21 2019 7:49am
Has anyone welded 1.5mm nickel plated copper with the Kweld? If so ....what power rating do you use? And are you using the standard electrodes?
Do you by chance mean 0.15mm?
by tatus1969
May 21 2019 3:57am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

BenjAZ wrote:
May 20 2019 9:19am
I was wondering what is the best way to cool down the wires.
I use to have a glass of water and stick them in that briefly. They cool down rapidly when doing this.
by tatus1969
May 10 2019 12:06pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

how does the fan cooling work for the kCap? i see a fan header but i dont see a mount for a fan. You need four 50mm M4 standoffs and then you can do this: Unbenannt.png i am also missing a STL for 3d printing the kCap case, the kWeld does have one. can you design a case that will fit a 12cm fan and...
by tatus1969
May 10 2019 11:58am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

I finally made it! "kSupply" power supply module 0-12V 0-70A to charge the ultracapacitor modules are ordered and available in my shop for preorder. https://www.keenlab.de/index.php/product/ksupply/ 8)
by tatus1969
May 08 2019 4:16am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

ps: nice PCB design, i love gold plating. i see it's your job or you have too much free time. :mrgreen: It's my job :-) Screen printed solder paste, hand placed components, soldering on hot plate. Looks like from the factory 8) include data logging for the simple minded graph lovers in the world li...
by tatus1969
May 07 2019 2:54am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

let me know if you need/want a tester, i am very interested in that product. it is limited to lipo or can it do different chemistries? I'll start a separate thread here as soon as I feel being close enough to give away first pre-series units. I'll be heavily relying on you guys here to measure all ...
by tatus1969
May 06 2019 11:39am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

worked fine. So with reading your comment Tatus about higher voltages, should I still pursue a different battery? Or is this "if it ain't broke don't fix it" and as long as I am getting good results I am good to go? These were all considerations for users who plan their new setup. If your battery d...
by tatus1969
May 06 2019 4:55am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

Here I can't help but ask the same boring question: any plans for 5S2P kCap? :wink: Yeah I know, sorry but no plans here at the moment. I have to focus on a new project that I am on, which is a novelty battery tester / charger (spoiler alert). I want it to revolutionarize our ability to assess and ...
by tatus1969
May 02 2019 6:11am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 775
Views: 91825

Re: kWeld - "Next level" DIY battery spot welder

is there any optical indicator to be sure that the caps are "charged"? in case of slow working and using a fanless psu for example. Like a LED or maybe possible to put a tiny Voltage display parallel?! The welder itself has an input voltage monitor, you can adjust the threshold in the menu to 7.9V ...