Search found 98 matches

by ossivirt
Feb 11 2021 2:48pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

0.2mm copper is so close to the limit what kweld can weld. With current close to 2000A it is barely possible atleast some cases. Also 0.2mm copper for 18650 cells is usually little bit overkill since 0.1mm or even nickel is enough for most cases. But please do post results of your work with copper t...
by ossivirt
Feb 11 2021 1:49pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

You can go to 100j but that might still not work since the reason why copper is so hard to weld is its ability to conduct the heat away from the weld spot. When you set more joules that basicly means longer pulse time and that means copper has longer time to spread the heat away so at some point you...
by ossivirt
Feb 09 2021 6:44am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

if i shorten my battery wires i get an "overcurrent" when calibrating. i need to add resistance but not inductance somehow. ive gone back and forth adding and cutting trying to find a sweet spot but if i go shorter than maybe a meter and a half ill get the overcurrent and cant weld. from ...
by ossivirt
Feb 09 2021 12:06am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

Why even try to measure ir if you use the battery for kweld? Just use kweld to measure amps during weld pulse and that should be enough in my opinion. 1500-1999A if you want to try copper and if just nickel up to 0.2mm little less is enough. I would like to have over 1000A anyway.. If battery can d...
by ossivirt
Feb 08 2021 4:50pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

Why even try to measure ir if you use the battery for kweld? Just use kweld to measure amps during weld pulse and that should be enough in my opinion. 1500-1999A if you want to try copper and if just nickel up to 0.2mm little less is enough. I would like to have over 1000A anyway.. If battery can do...
by ossivirt
Feb 03 2021 4:17pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

even the offical bussman fuses are well under a tenner, https://www.amazon.com/Cooper-Bussmann-ANL-300-Current-Limiter/dp/B000WSWXDC I’m doing 16 volts. I guess could charge up to18 for 5s iron cells. But why you two don’t think there’s a problem w the welder? Set to 8 joules at 16v w a good batter...
by ossivirt
Dec 30 2020 3:32pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

What settings u use for .1mm copper? Around 50 joules with my 1500A battery. With copper amps matter a lot more because weld time should be as short as possible to make sure energy is used to weld and not just heating copper around the weld.. With nickel or steel on top method I have not tried yet ...
by ossivirt
Dec 17 2020 4:34pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

Hey I have a question about power source. Made myself a 12v power source from 6pcs of 3000F 2,7v ultracaps. And somehow blowed off my malectrics v2.2 spot welder with 9ms pulse (two mosfets died) So my question is, can kweld handle that or I need less powerfull powersource? Hello. Someone can proba...
by ossivirt
Oct 09 2020 6:49am
Forum: Items for Sale - New
Topic: Mobipus Controller Official
Replies: 70
Views: 12440

Re: Mobipus Controller Official

Does anyone have a pre-charger he could recommend me for the 72600? I don't want the big bang when connecting my 20s 600A battery to the mobipus. Don't want to destroy it without riding it beforehand :D Resistor with right value and size must be most common setup since I have not seen many ready ma...
by ossivirt
Oct 02 2020 7:06am
Forum: Items for Sale - New
Topic: Mobipus Controller Official
Replies: 70
Views: 12440

Re: Mobipus Controller Official

Anyone else having experience with troubleshooting installation of the Mobipus Software? http://52.25.253.50/forums/viewtopic.php?f=7&t=104620&sid=5990ede7415f58fdfa22adbe4b11229a Weird problem: I've got the software for my Mobipus 72600 from https://ballaratebikes.com/pages/downloads but w...
by ossivirt
Sep 19 2020 2:35pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 88
Views: 7221

Re: ”The barge” efoil build

larsb wrote:
Sep 19 2020 2:31pm
I’ve got a drysuit so my season is eternal :wink:
Its all good and fun untill lake freezes over :lol:
by ossivirt
Sep 19 2020 2:06pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77386

Re: Spot Welding Copper Strips to 18650 Battery Cells

I have not tried thicker than 0.2mm copper so 2mm must be totaly different beast to weld. Maybe if electrodes are placed on opposite sides (one against 2mm copper and another 0.15mm nickel side) it would be easier or even possible to weld :roll:.
by ossivirt
Sep 06 2020 2:49am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

Also if you have more batteries you should try to ad one more paralel so weld current goes up to 1500-1800A and that gives you shorter pulse times what means in copper welding that more energy goes to weld and less for heating the copper around the weld. I bet you can turn down joule setting with m...
by ossivirt
Sep 04 2020 7:57am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

0.1mm copper 0.2mm nickel 90 joules 1150-1200 amps Looks a little hot, but during tests, this is where Good adhesion is. https://drive.google.com/file/d/1-K7nLbpHJJgJjSZHHYbwyDEvOcehPNMV/view?usp=drivesdk 90 joules sound like a lot to me. I think I used 50-60 just for 0.1mm copper. It is not very s...
by ossivirt
Aug 25 2020 4:10pm
Forum: Items for Sale - New
Topic: Mobipus Controller Official
Replies: 70
Views: 12440

Re: Mobipus Controller Official

Does anyone know by the way how to connect the hall sensors? The Mobipus has Hall B, G Y on its datasheet, meanwhile my me1304 Motor has "sin", "cos" and "shield". How do I connect them now? Hard to say for sure. I would put blue to blue and green to green so that leav...
by ossivirt
Aug 17 2020 3:33am
Forum: Items for Sale - New
Topic: Mobipus Controller Official
Replies: 70
Views: 12440

Re: Mobipus Controller Official

A couple of questions, if anyone knows. I get an occasional "Motor Coil Fault Type B" error with shutdown, what should I look for? Also, it appears that there is a firmware update available for the controller itself, is that advisable? I'd hate to turn the controller which is mostly worki...
by ossivirt
Aug 12 2020 1:53am
Forum: E-Scooter and Motorcycle Build Threads
Topic: KTM 200 exc goes electric
Replies: 215
Views: 31824

Re: KTM 200 exc goes electric

I have similar looking ant bms that just one time when I installed my battery back after some tire work gave the discharge mosfet abnormality error. I pulled one leg up from every mosfet and found the shorted one. Really strange way to go imo since it didn't faill under any load.. Anyway since I did...
by ossivirt
Aug 12 2020 1:32am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77386

Re: Spot Welding Copper Strips to 18650 Battery Cells

Kweld is probably best at that price point but 0.3mm copper could be too thick for it. Depends really how thick the nickel plating is on that strip. If you buy kweld for that job you want to go for dual lipos that will give close to 2000A weld current and thicker leads on electrodes to have any chan...
by ossivirt
Aug 03 2020 7:11am
Forum: Items for Sale - New
Topic: Mobipus Controller Official
Replies: 70
Views: 12440

Re: Mobipus Controller Official

Connector name: "16 Pin FW-C-16M-B FW-C-16F-B " on google or on alibaba "hall sensor connector white 16 pin" Took me an hour of research. Show some love pls. thx Cheers Thats a lot of pins for just hall sensors.. Controller has 26 pin d-sub connector for all low power connection...
by ossivirt
Aug 01 2020 1:41pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 88
Views: 7221

Re: ”The barge” efoil build

Improving the heat management of the controller: mounting a 400g alu block with heat paste between the two. Simple, crude but effective for a while :D 27DDDC34-DD3C-4ACB-889D-C1E9926A684D.jpeg That reminds me of a guy from other forum that mounted about same sized block of copper to his cpu and was...
by ossivirt
Jul 17 2020 3:50pm
Forum: E-Scooter and Motorcycle Build Threads
Topic: KTM 200 exc goes electric
Replies: 215
Views: 31824

Re: KTM 200 exc goes electric

j bjork wrote:
Jul 17 2020 3:33pm
180 holes later:

I hope I didn't overdo it :shock:
It is pretty light anyway, under 1kg on the scale..
Lets hope it survives. That looks like radialy laced rim and we all know cross laced is stronger but I have no idea what will happen next :lol:
by ossivirt
Jul 02 2020 1:53pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

I would like to ask users of kWeld, how is the status of heat, working temperature? I do not see any sink heaters, or fan? Thanks for answers... Never had any issues with the unit itself. Electrodes on the other hand get too hot to handle without gloves if pulse energy and time between welds dont a...
by ossivirt
Jun 27 2020 3:48pm
Forum: EBike General Discussion
Topic: Stealth Bomber type electric enduro purchase
Replies: 84
Views: 3737

Re: Stealth Bomber type electric enduro purchase

I have a EEB frame on order and suspension and other bits. But the drive train is still up in their air I'm doing as much research as possible before deciding on a Qs205, qs273 or a mid drive. I have EEB frame too. It can take mid-drive but its really meant for hubs. 205 is good for up to 12 to eve...
by ossivirt
Jun 27 2020 3:28pm
Forum: EBike General Discussion
Topic: Stealth Bomber type electric enduro purchase
Replies: 84
Views: 3737

Re: Stealth Bomber type electric enduro purchase

Some reason I get the feeling people don’t like it that I’m happy about my purchase lol There is always hub vs mid-drive argument going on somewhere.. Both have their good and bad features and every person has their own preference based on their experience and usage. This kind of bike is not lighte...
by ossivirt
Jun 21 2020 1:13am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 192641

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

Would the resistance reading after a spot weld be a good proxy for the resistance of the material being welded (assuming the strips are identical in size and are being spot welded to the exact same battery)? I had success in spot welding two different materials (SigmaCLAD and “Nickle Silver”) using...