I didn't upgrade to 6 gauge though I did think about it. Despite being quite low SOC/voltage (11.4V) once due to an issue with the PD9160 getting 'fooled' by the solar charge controller, most I've ever seen is about 50-55amps and that only for a short time - dropped off quickly as battery voltage increased and hovered in the 30-35amp range eventually dropping to 6amps or so. But, I never took pass thru temperature into account. With solar keeping them pretty close during the day, I started to wonder what I would see when PD went into bulk mode and rarely saw more than 12amps when we reached destination.