We are talking 8s applications, not 12s. You need 63V caps min on 12s. I haven’t researched caps for that volt application. Even 63V is cutting it thin.
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For 12s applications, I would use the EGPD800ELL162MM40H, 0.012ohm, 80V, 135 Degree C. That is a very high temp rating, what the application calls for. They cost about $4.30 each. About 3X over the Rubycon caps... I guess you get what you pay for, eh?
At this high of voltage, you must use a pre-charging circuit. You will eat your connectors up if you try to snap them and it will scare the rabbit poop out of you! Use a 50ohm, 1/2W resistor for that purpose.
I use 0.063” copper sheeting, soldering two pieces on top of each other as the “PC Board”. I make two rails of copper, drilling the copper to pass the lead, soldering to the copper. Do not bend the caps leads 90 degrees to form this bus! That makes current choke points and dramatically reduces the effectiveness of the caps! I then epoxy cost between the copper rails and back that up with a piece of fiberglass board, 0.063” stuff, no copper on it...
Here’s a monster cap Bank I built for Dashbota he put in his speed rc car, to hit a straight speed record...
You can get the copper sheeting on metalsonline.com. So much better than a PCB! Good luck and have fun fabricating, I like that part....