J2T2 wrote: ↑
Fri Apr 26, 2019 11:55 am
150km/hr is around 95mph so somewhat academic here in the UK! To get even an average of 70mph/100kmh you have to be travelling at 80mph/130kmh where you can and on the UK motorways that is not always advisable or even possible, setting aside illegality.
So in the UK the charging/speed strategy is going to be different.
True but the same logic still applies at lower speeds as below extreme example demonstrates - if you need to drive 450 miles from charging point B to charging point K and drive 50mph it takes you 9 hours and at 75mph it takes you 6 hours.
If you followed Chewy's driving class then at 50mph you can get to 300wh/mile or 135kW while with Jag style driving at 75mph you get 600wh/mile or 270kW. I know not really fair but just to demonstrate.
With 50mph you charge 67.5kW from 10% till 91% - drive 225 miles and charge again to 91% to drive the last 225 miles. 2 x 225 = 450
With 75mph you charge 45kW from 10% till 65% - drive 75 miles and charge again to 65% and that you repeat 5 times = 6 x 75 = 450
9hrs driving + 2x charging 60+5 min = 11hrs 10mins total
6hrs driving + 6x charging 35+5 min = 10hrs total
Faster driving and faster charging (till lower SoC %) is making the difference despite double the consumption and double kW charged and as well having 4 more stops costing 5 minutes extra (off highway, park, start charger, end charger and drive away).
For me the added benefit is that you are stationary 1.5hr longer which should allow you to eat, drink, read a book, watch Netflix, do emails or ..... all kind of things you should not be doing while driving.
I guess the bigger issue with UK is the near complete absence of 100kW chargers or reliable fast DC chargers in general.
Same example but now with 50kW chargers instead of 150kW chargers shows equal total time.
9hrs driving + 2x charging 85+5 min = 12hrs total
6hrs driving + 6x charging 55+5 min = 12hrs total
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