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 rated voltage (2,85V instead of 2,70V), a lower ESR (1,00mR/1,60mR instead of 2,2mR) and a higher short circuit current (3000A instead of 1200A).
From my understanding, now I can charge these caps to a voltage of 8,55V instead of 8,1V and with the lower ESR this new kCap module should deliver more current than the older version. Although I don't think I can change the voltage limit to which the caps will be charged, because very likely it is set in the electronics of the kcap-board. My thinking is, that the electronics will just cut the input voltage from the caps when they are charged and reconnect it when they are partly discharged.
So what I still don't know is, what is the difference when connecting i.e. 14V input voltage instead of i.e. 9V to the kCap?
Is it possible to change the voltage of the caps by just increasing the input voltage? (which would be not good with 14V input voltage).
Thanks
Wolfgang