SageBrush wrote: ↑
Wed Aug 07, 2019 3:20 pm
The important difference is that it is trivial to calculate SoC from the Tesla range, while it is impossible in a LEAF
Tesla *does* have a GOM if you will (completely separate from the SoC/EPA-miles display) that attempts to estimate destination SoC. It is remarkably accurate because it knows topography and with driving takes speed and weather into account. The algorithm is brilliant -- try to not confuse it with the SoC gauge.
Several years ago the algorithm tended to underestimate actual energy use at highway speeds of 70 mph or higher (speed limits in the Intermountain West are 75 or 80 mph), then a firmware update improved it. Since the update it has been amazingly accurate for normal driving conditions. The real-time update of estimated SoC at the destination gives feedback to the driver about actual
driving conditions (wind, snow, whatever). If it is dropping one slows down or selects a nearer charging stop. If it is stable or increasing, the usual scenario, there is nothing to worry about.
The algorithm also lets the driver know when he/she has charged enough and can continue on with the trip — it is faster to charge just enough to get to the next Supercharger Station, plus a small "buffer" (reserve), because the charge rate tapers as the battery fills. One can, of course, continue to charge longer to build a bigger buffer before leaving, if the weather looks unfavorable. Otherwise, the Tesla suggested leaving time is usually good enough. I often find that the car is ready to go before I am.
^ An example of the estimated SoC at destination in my S (the Model 3 can show much the same information on its horizontal screen). In this example I am doing a bit better than the originally estimated SoC at the destination because my green line actual is above the grey line original estimate. It isn't necessary to display this plot because the SoC percentage is also displayed in the navigation directions (upper left box). Again, this SoC estimate is updated in real time as one drives and is very helpful in tracking actual energy usage on a trip. [The vertical dashed line on the navigation map is the Utah/Colorado border.]