Here’s a follow-up. We sanded the busbars with the Fein Multimaster and some 3M metal finishing pads, then tinned them. Worked awesome. Of-course I’m not going to polish the tin like Blue Sea Systems does.
I got an 8-stud version in ($115
) for the negative busbar and these two 4-position ones are for +12V and +24V.
The liquid tin works great. I also ordered the FTZ heavy duty
power lugs for 4/0 cable and 1/2” studs. The
lithium cells have 14mm studs so I used a step drill to widen them, then the liquid tin to coat the bare copper and they now look like factory M14 terminals
These
power lugs are monsters, I don’t think much more than two will fit on a stud!