I recall you showing photos of a big bank on racks, and making this change.
Do you get a difference in DC voltage drop, or AC voltage (seen by oscilloscope) along length of busbar?
How about difference in contact resistance between cell terminal and cable terminal? Or cable terminal to cable strands?
How do DC resistance measurements compare (if you have a way to do that.)
I've done the math on skin depth, using idealized models in engineering school.
At very high frequencies, surface roughness becomes part of the path length.
I take measurements of resistance and reactance vs. frequency for various components like chokes and transformers, using a meter that goes from 20 Hz to 100 kHz. The values change a lot over low frequency, and differ vs. DC ohms.
I also have designed, measured, used RF components, including 11 MHz transformers I hand wound with 30 awg wire-wrap wire, and procured from a vendor for production.
So my work doesn't exactly match busbar applications. I don't have equipment for high current tests other than battery/inverter and AC grid/resistive loads. But I have difficulty understanding how laminations vs. strands make a difference for battery DC 60 Hz ripple currents. I would hope kHz ripple from switcher is handled by capacitors in inverter.
I think it ends up being 120Hz on the DC side. I did have a scope on my battery for a bit and definitely saw a ripple with bus bars (let alone cables). I didn't get any details because I ended up blowing a fuse and I've become gun-shy to try again. The scope was acquired after I made the change to bus bars and I no longer have a way to do a comparison.