panozguy said:
I have a dedicated 12V AGM, 100AH battery, practically brand new (4 cycles). Is this adequate to power the K weld 'as is'?
I don't have sufficient references with regards to AGM batteries. If that battery has a CCA rating, then it should be at least 700A. Deep cycle batteries are optimized towards cycle life and not internal resistance, therefore starter batteries work better. A regular 12V car starter battery of 65AH to 100AH works well, but it should be new and at room temperature.
panozguy said:
I also have 2 x dedicated 12V LiFePO4 Valence U27-12XP, 138AH apiece. Would those work adequately in parallel to power the K weld 'as is'?
Do you have internal resistance ratings for the cells, so that the current can be estimated? It might well be that they are too strong.
panozguy said:
I also have 2 x 12V HP server power supplies HSTNS-PD19, capable of 12V/75A each. I can dedicate one or both of these to the K weld. Will some combination of these power it adequately? Must I also acquire a K Supply? I can modify the power supplies myself easily.
They can't charge the capacitors by themselves, as the initial short circuit of the empty caps will cause an overcurrent hickup. That's where kSupply comes in place, it regulates current until the capacitors are topped up.
This solution is recommended only for intense use, e.g. when welding larger packs and high firing rate is important. Otherwise, kCap can be charged with almost any kind of current limited source with 8 to 12V output.
panozguy said:
Will there be caveats to using any of these? Increased time between welds, etc?
It depends on your work piece. 0.1mm nickel doesn't require much current, but 0.3mm nickel much more. kCap is limited to 0.2mm, and for 0.3mm a battery should deliver at least 1400A.