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  1. E

    kWeld - "Next level" DIY battery spot welder

    Here is the complete document, where it is described why one side is making a getter connection. Also a lot of other interesting things there to read. This link was already posted a few posts above...
  2. E

    kWeld - "Next level" DIY battery spot welder

    A few posts above yours you can find good explanations aboit kcap and sandwich method.
  3. E

    kWeld - "Next level" DIY battery spot welder

    Thanks for the answers :thumb:
  4. E

    kWeld - "Next level" DIY battery spot welder

    @tatus (Frank): For me it would be interesting to know the differences between the old kCap-board (Maxwell) and the new one (SkelCap). From the posts here it looks like that you can't overcharge the new board, because the charging automatically stops and so there is also no need for increasing...
  5. E

    kWeld - "Next level" DIY battery spot welder

    Charged until the kCap shows that it is full, so more than 8.2V. I didn't remeber the correct voltage, this happened months ago. But this little higher voltage alone can't explain the rise of the current for 50% more.
  6. E

    kWeld - "Next level" DIY battery spot welder

    In the future I will maybe get bigger cables to reduce the resistance to get even more current, but for now it is enough for me.
  7. E

    kWeld - "Next level" DIY battery spot welder

    Here is the datasheet. Much lower ESR and therefore much higher short circuit current.
  8. E

    kWeld - "Next level" DIY battery spot welder

    The new version of mine uses SkelCap 0300 with a rated voltage of 2.85V, so 0.15V above the old ones.
  9. E

    kWeld - "Next level" DIY battery spot welder

    9.5V is also OK on my side.
  10. E

    kWeld - "Next level" DIY battery spot welder

    As already said in the past, 8.2V is too low to get the Caps completely full, if it is a newer kCap with different capacitors on it.
  11. E

    kWeld - "Next level" DIY battery spot welder

    On my kCap with the SkelCaps I need tu use more than 8,1V, otherwise the indication LED's on the PCB of the kCap would indicate that it is not fully charged. I increased the input voltage to around 9-10V and that is fine. As written a few posts before, it looks like that the new SkelCaps can...
  12. E

    kWeld - "Next level" DIY battery spot welder

    Hello The newer kCap have different caps and need a higher input voltage. Increase the voltage and the kcap will function. I have written something about the new kcap a few posts before. I think on my kcap I have increased the voltage to around 9 to 10V.
  13. E

    kWeld - "Next level" DIY battery spot welder

    Has anybody made a kind of base plate to connect the kCap and the kWeld physically, so that it is one part?
  14. E

    kWeld - "Next level" DIY battery spot welder

    The length has nothing to do with the diameter. The length is still the same when you upgrade your cables to AWG6. This is because of the inductive kickback.
  15. E

    kWeld - "Next level" DIY battery spot welder

    https://www.meanwell-web.com/en-gb/ac-dc-single-output-enclosed-power-supply-output-7-hrp--300--7.5
  16. E

    kWeld - "Next level" DIY battery spot welder

    This was a Meanwell 7.5V, 40A, 300W. Just google. I think a few posts back there is the exact description.
  17. E

    kWeld - "Next level" DIY battery spot welder

    Thanks for the answer, I will definetely take a power source with around the 8V and not 13.8V or such things. I just wondered and be interested in the function and what the changes on the new version r6 are (if only the caps are changed to different ones or if also some changes were made on the...
  18. E

    kWeld - "Next level" DIY battery spot welder

    I have checked the manual of the kCap again and there is written: -) Any current limited lead acid battery charger with 13.8V output voltage -) Output voltage is automatically kept in 8.0V – 8.3V range (power supply disconnect) So, it looks like it is that way what I thought with cutting the...
  19. E

    kWeld - "Next level" DIY battery spot welder

    OK thanks for the answer. This would mean, that you can adjust the voltage level of the caps with adjusting the input voltage of the kcap. The question then would be, why is it written, that the input voltage is from 8V up to 14V? 14V would be far too much, so there must be any kind of safety...
  20. E

    kWeld - "Next level" DIY battery spot welder

    I have bought now the kWeld with kCap and I have found a interesting detail. My kCap has the revision 6 and is now equipped with SkelCap SCA0300 ultra capacitors instead of the Maxwell caps. The datasheets states that they have a little bit less capacitance (300F instead of 310F), but more...
  21. E

    kWeld - "Next level" DIY battery spot welder

    Hi Flippy, thanks for rour reply and your answers. Yes I have read it about the balancing of the kCap, which is OK and necessary. The HRP-300-7.5 has 40A of current delivery, so I also think this enough for constand welding. The question what I'm interested in here is, what the input...
  22. E

    kWeld - "Next level" DIY battery spot welder

    Hello Forum, my name is Wolfgang, I am from Austria and I'm new to this forum. The last years I welded my packs with a Sunkko 709AD spot welder, which I modified to ensure that I can weld 0,15mm Nickel-sheets. Now I want to step up to a better solution with real spot welding instead of...
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