I am trying to write some code to determine when to start charging my car given a set end charging time - in my case 7am. One of the variables that can effect charging rate is temperature. In moderate temperatures my charge rate is roughly 0.33SoC/minute - so in 60 minutes I can charge my car from 70% SoC to 90% SoC - this is my typical day. Therefore I would want to start charging my car at 6am. But what if it is really cold - do I want to start earlier? Does anyone have a good feel for how much charging is slowed down by cold temperatures? Is it a (roughly) linear process? Or is it just a case of warming the batteries for X minutes at the start of charging? Or is it both? At what temperature does this start to kick in ? 10C? 0C? So far this winter I haven't noticed too much of a slow down but we haven't had too much cold weather yet - this morning my garage was 10C.