The charge controller is surprisingly large (to me) relative to the rest of the system. I don’t have much experience - is there a reason it needs to be, or is the charge controller significantly overspec’d for this 50W panel?

BOM (linked from github page): https://docs.google.com/spreadsheets/d/1X0RDVBC6ifIS6Qov1loz...

panel short-circuit current is 3 A, but is paired with a 20A charge controller.