If I could rate this location lower than a 1, I would.
This supercharger is *way* too busy during commute hours, and *desperately* needs an attendant in the evenings. I've often seen a line of 6+ cars waiting to charge, which translates to waiting for thirty minutes in your car before you can even *start* charging.
And during the weekend, you can pretty much forget about charging here. I pulled in today thinking that I would charge for a half hour, and they were lined up almost to the far end of the parking lot. (I would estimate that I was at least the tenth car waiting, which in a twelve-station charger, likely means about an hour wait just to start charging.) I gave up and drove on. I'm just going to have to hope I don't end up stranded.
Also, at least a couple of the chargers are flaky, and as a result, when you plug in, your car will tell you that it is going to take 2+ hours to charge. If that happens, don't just accept it; unplug and replug. Doing so will typically result in a more normal 1-hour charge time. Unfortunately, if people don't know to do that, they'll end up charging at half speed and tying up one of the grossly insufficient number of charging stations for even longer.
So if you have to wait half an hour at the beginning and then get stuck with a slow charge speed, the worst-case charge time is almost three hours. During evening commute hours, I would recommend avoiding this supercharger at all costs. It is just going to keep getting worse.
They desperately need to expand this supercharging station. It should be at *least* *double* its current size, and that's without the Model 3s making the problem worse. Unfortunately, they chose to instead build stations in other places that aren't very practical to most of the people that use this charging station. The Cupertino station is on a different enough route that it is unlikely to have any impact on Mountain View, and the Sunnyvale station is at such a terrible location (up to half an hour excursion from the freeway, thanks to unholy levels of southbound traffic in the evenings) that it is unlikely to even get much use except by locals.
With the Model 3 coming out, they really need to either double the number of stalls at this location or add a second Mountain View supercharging station of a similar size--perhaps at CostCo on Rengstorff. Otherwise, in a couple of years, it's going to be really, really bad, to the point of being hopelessly inadequate.
* For the curious, the planned Sunnyvale station, located at Target, despite being only six blocks from 101, is often 15+ minutes away during evening commute hours, because 85 SB is almost always a parking lot (~5 MPH), and so everybody uses Mathilda, Mary, Wolfe, and Lawrence Expressway as though they were extra freeway lanes, which also creates secondary backups on all the cross streets (Central Expressway, Maude, El Camino, etc.). That means a 20+-minute round trip (mostly at very slow speeds) from any of the new high-density businesses or residential areas north of 101 (the only parts of Sunnyvale that are really growing at the moment), making it useless not only for long-distance commuters, but also for the majority of people who live and work locally.
As a result, the Sunnyvale station can effectively serve only a few of the southern residential parts of Sunnyvale, plus anybody who is willing to take a 30-minute detour off the highway just to shop at that particular Target store. And on weekends, that parking lot is packed, so it will probably be thoroughly ICEd and unusable then, too. The Sunnyvale Target is absolutely the worst location I could possibly imagine within the city of Sunnyvale. I can't imagine why they picked it, unless they just didn't bother to ask anybody who lives in Sunnyvale for their opinions. They should have gotten spaces in the Mercado lot or Mission College, right off the freeway. That location would actually make sense. read more