@gothitjulie thanks very informative never knew that.
These charge curves are something we don’t even think about until researching EVs, we just assume it’ll be 100kW charging from zero to 100%, but as you can see from those two curves it’s very different in reality. Yes you may get the max charge speed at low SoC when the battery is warm, I often do, but that soon tails off to progressively lower charge speeds.
This leads in to when it’s the right time to leave a Rapid charger, on my e2008 it’s at 72% SoC when the charge rate drops off a cliff, for a BMW i3 it’s about 90% SoC when it falls. This is the time when it’s quicker to do the next leg of the journey to the next Rapid than staying to charge to a higher state.
Remember 20% to 80% takes about the same time as 80% to 100%. This is why experienced EV drivers can be seen leaving the charger earlier, they are riding the higher charging rates in those curves.