Another 4 hours at Yosemite Pine RV Resort got me enough juice to make it all the way home without the stop in San Ramon. This time I was more confident in my range calculations. When the traffic started getting ugly around Altamont Pass I gave up on the 60-65 mph nonsense and drove the rest of the way home with the normal traffic flow.

The trip out took 54.5 kWh (as reported by the Trip screen); the trip home took 48 (plus 17 for the loop to Glacier Point). So in theory, I could make it without an intermediate charge if there was a charger in Yosemite itself. But that would be cutting it awfully close. But the stop in San Ramon is a pretty good solution. Now what do we have to do to get a charger in Yosemite Valley?

BTW, there's an important factor to remember when doing battery charging computations. The ESS's total capactiy is 55 kWh (at least when it's new; sometime in the future Tesla will need to give us a way to determine the actual number). But charging the ESS is only about 80% efficient (at 240v; at 120v it's much lower). So it takes 68 kWh from the utility to get 55 kWh into the ESS. (So for example, if you're charging at 240 volts and 40 amps you're drawing 9.6 kW from the utility but only putting 7.68 kW into your ESS.)