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  1. K

    DIY Spot welder power- limiting factor?

    I have same electronics and everything works 100%. Just use 70mm2 secondary wire and dont worry. You will get 1.4 -1.8V with 2 full turns and this is enough for good spot welds. One more thing - always use 20ms at start and increase current when you test welds. If your nickel strip is thick you...
  2. K

    JP spot welder open source

    I have all parts for 10pcs but simply dont have free time to finish this project.
  3. K

    bluetooth BMS?

    Thanks i ordered 6S-10S version.
  4. K

    bluetooth BMS?

    I have 1 question about JBD bluetooth BMS. Is android app enough for settings like charging voltage, balance start voltage and discharge cutoff voltage? I want to charge my pack to 4.10V. I dont wanna buy UART module if i dont need it. Thanks!
  5. K

    BMS for 4S30P battery pack

    You can set cut-off voltage to lower value (4.1V for example) and save battery life. Monitoring is big deal - easy to detect problem with some group of cells - and its easy to find that cell later and replace it. Also quality of BMS is higher.
  6. K

    BMS for 4S30P battery pack

    You have smart bms. Check this thread: https://endless-sphere.com/forums/viewtopic.php?f=14&t=88676 https://www.aliexpress.com/item/33043068582.html?spm=2114.12010612.8148356.23.55a53de2ayFwtM Check this store also...
  7. K

    BMS for 4S30P battery pack

    You asked for reccomendation from your list - i think second is good. https://www.aliexpress.com/item/32837937191.html?spm=a2g0s.9042311.0.0.27424c4dP1O6H3
  8. K

    BMS for 4S30P battery pack

    I used second one for acudrills - without any issues so far.
  9. K

    BMS for 4S30P battery pack

    Probably not because you dont need better one - this bms can handle 10A without isues. BTW why 30P battery? What is this for?
  10. K

    BMS for 4S30P battery pack

    I use this for accudrill battery repair and works just fine. https://www.aliexpress.com/item/32852015245.html?spm=a2g0s.9042311.0.0.7c1b4c4dJcgbsF
  11. K

    Which cells for battery and my project.

    Motor voltage?
  12. K

    JP spot welder open source

    Riba - can i use 1N4004 diode instead of 1N4001? Only difference is voltage if im not wrong.
  13. K

    How to change cutoff voltage of the controller

    Yeah they are in series in my case also. 1.5kΩ+10kΩ - 11.5kΩ total. My controller stopped at 20.25V. I will now try use different value of smaller resistor - will try with 2kΩ and check cutoff voltage. After that it should be easy to calculate right value. Yeah - i managed to set cutoff...
  14. K

    Spot welder

    Probably Kweld https://endless-sphere.com/forums/viewtopic.php?f=14&t=89039
  15. K

    How to change cutoff voltage of the controller

    Yeah i figured that also - those 2 resistors are responsible for voltage cutoff. Will try to test with my variable PS and after that i will use math to change resistor value. Only strange thing - it seems to me those 2 resistors are in series in my case - not parallel. Will check later with...
  16. K

    How to change cutoff voltage of the controller

    Can you reccomend some?
  17. K

    How to change cutoff voltage of the controller

    Controller is chinese YK31C 24V 500W. 6S battery - cutoff voltage at 3.45 is to high. Panasonic NCR18650BD have lot of energy stored between 3.45 and 3.2. How to change cutoff voltage from 20.5V to 19.2V ? Controller have IC with this marks 339 ST MZH9830 LM339 if im not wrong. I guess...
  18. K

    JP spot welder open source

    I recieved pcbs from JLCPCB. 13 days from order day. This is record for me when i order something from China. Also i should take over other components tomorrow - arrived from mouser to my local electronics store. After that i need to make busbars and cables with electrode holders/electrodes...
  19. K

    Testing the internal resistance of a li ion cell and making determinations

    So in reality voltage drop test can give us only DC resistance results - if this is accurate. Also should we measure this at 4.2 voltage or at 3.7V? Some semi-pro tool like vapcell yr1030 will measure AC resistance which is totaly different thing. Which one is important for us? Probably first...
  20. K

    Boston-Power Swing 5300 Li-ion cell test

    I just found 4 Sonata 4400mAH in some ASUS battery pack. Big suprise for me :) First time for me to see something like this.
  21. K

    Nkon not shipping outside EU?

    I just sent an email - there is no shipping options for Serbia anymore. Dont know why.
  22. K

    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...
  23. K

    JP spot welder open source

    Can i use some other similar mosfets? Cant find 1324 at my local stores. EDIT: never mind i managed to find it.
  24. K

    JP spot welder open source

    Thanks i ordered pickit 2. 1 question about resistors - can i use any resistor or wattage is important?
  25. K

    JP spot welder open source

    Most difficult thing to do for me is to program pic controller - never tried this :)
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