Search found 73 matches

by krlenjuska
Oct 16 2019 8:10am
Forum: Battery Technology
Topic: MOT Spot Welder for 18650 Li-ION batteries
Replies: 6
Views: 235

Re: MOT Spot Welder for 18650 Li-ION batteries

I just tested my bigger transformer (1750VA) and its working just fine. I tested it on pure nickel 0.1 and 0.15 and welds are very good. I dont have thicker nickel right now but will test in the future. This transformer should be enough for 0.25 nickel IMO - maybe 0.3. Welds are clear and strong. I ...
by krlenjuska
Oct 14 2019 10:36am
Forum: Battery Technology
Topic: JP spot welder open source
Replies: 14
Views: 458

Re: JP spot welder open source

riba2233 wrote:
Oct 12 2019 10:46am
You can use anything from 0.25 w above.
Can i use some other similar mosfets? Cant find 1324 at my local stores.

EDIT: never mind i managed to find it.
by krlenjuska
Oct 11 2019 3:56pm
Forum: Battery Technology
Topic: JP spot welder open source
Replies: 14
Views: 458

Re: JP spot welder open source

I ordered PCBs and all components - will try to make this :) Great to hear, please post your progress and pictures here 8) Most difficult thing to do for me is to program pic controller - never tried this :) It's simple once you have a programmer like pickit 2 or 3 with their own software, just con...
by krlenjuska
Oct 10 2019 1:28pm
Forum: Battery Technology
Topic: JP spot welder open source
Replies: 14
Views: 458

Re: JP spot welder open source

riba2233 wrote:
Oct 10 2019 1:22pm
krlenjuska wrote:
Oct 10 2019 12:54pm
I ordered PCBs and all components - will try to make this :)
Great to hear, please post your progress and pictures here 8)
Most difficult thing to do for me is to program pic controller - never tried this :)
by krlenjuska
Oct 10 2019 12:54pm
Forum: Battery Technology
Topic: JP spot welder open source
Replies: 14
Views: 458

Re: JP spot welder open source

I ordered PCBs and all components - will try to make this :)
by krlenjuska
Sep 18 2019 1:29pm
Forum: Battery Technology
Topic: MOT Spot Welder for 18650 Li-ION batteries
Replies: 6
Views: 235

Re: MOT Spot Welder for 18650 Li-ION batteries

Try to use thicker electrodes. Also increase pressure. You can buy cheap chinese controller for MOT spot welder.
I use this and works great on 230V input. https://www.aliexpress.com/item/3287381 ... 4c4dzNOrsE
by krlenjuska
Sep 18 2019 6:09am
Forum: Battery Technology
Topic: MOT Spot Welder for 18650 Li-ION batteries
Replies: 6
Views: 235

Re: MOT Spot Welder for 18650 Li-ION batteries

Without current control its very difficult to get good welds. Try to decrease time or get some control module.
by krlenjuska
Sep 15 2019 6:48pm
Forum: Battery Technology
Topic: Pen size spot welder
Replies: 3
Views: 165

Re: Pen size spot welder

Its only welding pen for spot welder. You still need spot welder - MOT spot welder, battery spot welder, any other welder... I think you can make this by yourself easy way for much less than 25$. IMO 2 separate electrodes in each hand is still better option because you have better control. Also i do...
by krlenjuska
Sep 09 2019 3:09pm
Forum: Battery Technology
Topic: good quality spot welding electrodes?
Replies: 12
Views: 1034

Re: good quality spot welding electrodes?

Do you get electrode sticking when welding pure nickel? I did until I sanded a larger flat spot on the tip. Having the larger surface are seems to prevent sticking, although I haven't really done a controlled experiment. This is because amperage is too high for that diameter of copper wire. Use 5mm...
by krlenjuska
Aug 30 2019 1:49pm
Forum: Battery Technology
Topic: DIY spot-welder, transformers from microwave ovens?
Replies: 54
Views: 10360

Re: DIY spot-welder, transformers from microwave ovens?

Buy this - its easy way to control your time and current. Unfortunately 20ms is lowest setting but it good enough.

https://www.aliexpress.com/item/3287381 ... 4c4dzyyeAO

BTW i have spot welder with same MOT. :)
by krlenjuska
Aug 20 2019 2:03pm
Forum: Battery Technology
Topic: How in the world do you program this spot weld module?
Replies: 1
Views: 131

Re: How in the world do you program this spot weld module?

I had same problem ith settings - use some light version switch to trigger it.
Its bad module -welding time is always same no matter which settings i use.
NY-D01 is still best option for cheap module. Simple and precise. 20ms step isnt perfect but its good enough for average MOT spot welder.
by krlenjuska
Aug 20 2019 11:34am
Forum: E-Bike Technical
Topic: Meanwell LRS-350-24 current limit mod question
Replies: 2
Views: 165

Re: Meanwell LRS-350-24 current limit mod question

Thanks for your answer. I will try to read IC number.

@moderator no im not sure how this happened. i just uploaded pics and tried to add them to post like i do to any other forum.
by krlenjuska
Aug 14 2019 3:44pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1131
Views: 98344

Re: bluetooth BMS?

Is there any 6S smart bms? I can see 3S-5S and 7S + but cant find 6S anywhere...
by krlenjuska
Aug 13 2019 5:47pm
Forum: E-Bike Technical
Topic: Meanwell LRS-350-24 current limit mod question
Replies: 2
Views: 165

Meanwell LRS-350-24 current limit mod question

How can i mod this SMPS to add potentiometer for current adjustment? https://i.ibb.co/n3YRTBn/IMG-20190814-004122.jpg https://i.ibb.co/7KWs8xC/IMG-20190814-004114.jpg https://i.ibb.co/5rRnJk0/IMG-20190814-004105.jpg https://i.ibb.co/ZMyCMBM/IMG-20190814-004048.jpg https://i.ibb.co/9886PLF/IMG-201908...
by krlenjuska
Aug 12 2019 6:38am
Forum: E-Bike Technical
Topic: MeanWell Mods - S-350-48
Replies: 23
Views: 13474

Re: MeanWell Mods - S-350-48

I have Meanwell LRS-350-24. Is there any easy way to identify resistor responsible for current setting?
by krlenjuska
Jul 25 2019 11:29am
Forum: Battery Technology
Topic: Charging battery faster
Replies: 88
Views: 2730

Re: Charging battery faster

scootergrisen wrote:
Jul 24 2019 7:09pm
How do the people that make scooters decide when charger comes with the scooter?
Why did they decide that my scooter should come with a 5A output charger and not a 3A or 8A?
3A charger is much cheaper than 8A or 10A. Also smaller batteries (less cells in parallel) often comes with 2-5A chargers.
by krlenjuska
Jul 23 2019 11:17am
Forum: Battery Technology
Topic: Charging battery faster
Replies: 88
Views: 2730

Re: Charging battery faster

If you want your batteries to last longer you should avoid to charge to 4.2 - 4.1 is good enough. Also dont discharge them bellow 3.2v. Keep charge and discharge current as low as possible. With this you can prolong your battery life 2 or 3x. Imo you need 8-10amps charger. 3-4 hours is not long time...
by krlenjuska
Jul 21 2019 6:48am
Forum: Battery Technology
Topic: Charging battery faster
Replies: 88
Views: 2730

Re: Charging battery faster

Your battery datasheet shows 1C charging current. In your case its 2,5A. You have 10 cells in parallel in your battery pack so its 2,5x 10 = 25A. You can buy some quality 25A charger but you should try first. Find charger from some friend and test your battery. Im not sure about two chargers-maybe i...
by krlenjuska
Jul 21 2019 5:36am
Forum: Battery Technology
Topic: Charging battery faster
Replies: 88
Views: 2730

Re: Charging battery faster

So lets say i get a 25A charger and that is the maximum the cells can tolerance and it works fine. What will happen if i get a 100A charger? Is the BMS not designed to protect the cells so they will not get charged at 100A? The BMS says 13S-P Joydo. So that means 13 series of cells right? Seems the...
by krlenjuska
Jul 19 2019 9:53am
Forum: Battery Technology
Topic: Best cheap spotwelder?
Replies: 19
Views: 1213

Re: Best cheap spotwelder?

Best cheap spot welder for me is MOT spot welder. 100-200€ plus battery is not cheap for me. If i need to pay 150-250€ for spot welder than i suppose money is not the problem. In that case best option is to buy some branded battery. I guess at least 50% of people cant afford that 150-250€ spot welde...
by krlenjuska
Jul 15 2019 3:34am
Forum: Battery Technology
Topic: Best cheap spotwelder?
Replies: 19
Views: 1213

Re: Best cheap spotwelder?

zzoing wrote:
Jul 14 2019 8:23pm
Have just found this funny welder from China. Looks pretty crazy. https://www.aliexpress.com/item/3282464 ... 55b7YiGTF2
Its only control board for MOT welder. I tried it and works 100%.
by krlenjuska
Jun 10 2019 4:39am
Forum: Battery Technology
Topic: Need Urgent Help Finding a Specific Design of Nickel Strip
Replies: 7
Views: 487

Re: Need Urgent Help Finding a Specific Design of Nickel Strip

https://www.aliexpress.com/item/3288745 ... 6a39RmeXG5

This is 27mm with 12mm holes. 19mm between cells. 0.15 thickness.
Its 7mm wide if this is close enough for you.
I bought from them and its pure nickel.
by krlenjuska
Jun 04 2019 8:16pm
Forum: Battery Technology
Topic: "Acceptable" 8S BMS for 18650s
Replies: 10
Views: 364

Re: "Acceptable" 8S BMS for 18650s

Deligreen BMS from aliexpress if you have time to wait for delivery.
I use them and its ok so far. Also its cheap.
by krlenjuska
May 15 2019 6:50am
Forum: Battery Technology
Topic: How to increase voltage on this charger without trimpots? Identify resistor that controls the voltage? 72V to 84V
Replies: 9
Views: 548

Re: How to increase voltage on this charger without trimpots? Identify resistor that controls the voltage? 72V to 84V

Unfortunately it doesn't have any trimpots inside, but I did a bit of reading up ad it should be possible to identify a resistor on the board and add a trimpot parallel to it. There is no way you can do this without rewinding transformer secondary. Try to measure output voltage from transformer fir...