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I went a different route; 4s4p bank of LiFePo4 cells at 8 AH each.
This is for my daily driver/race car (daily racecar?) and weighs around 12 lbs. I went this route after looking over lead acid/cap combos as well as just straight caps.
If I were constrained for space/weight, I'd probably do a boost converter setup with a single larger iron cell and a charger dedicated to that and a cap bank just big enough to start whatever it was I'm working on; however the size of this setup is rather small at less than 6.5" x 6.5" x 6" high, with posts.
With my recently added requirements of being able to run the water pump and fans with the engine not running, caps no longer made sense.
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