So I had an interesting experience with one of these EVgo sites last week. I wrote some of this up on plugshare, and thought it might be of interest to elaborate here.
I drove up to the Seattle area over Thanksgiving. I picked up one of my sons at the Sea-Tac airport mid-day, then later in the evening picked up my wife. There are two EVgo chargers w/Tesla adapters in the Sea-Tac cell phone lot. I used one of the chargers the first visit and the other on the second visit. In both cases, I used my EVgo rfid card to authorize the charge. (Had to fix up the credit card I had on file since we changed the numbers recently. Did it via the EVgo app on my phone.) Once authorization was working, in both cases charging again failed until I fully seated the CHAdeMO plugs into the Tesla adapter sockets. Obviously the CHAdeMO plugs had been used by non-Teslas and hadn't been properly plugged into the adapters. The plugs make a click when it snaps into place. Then everything worked fine.
On the second visit, a Model X pulled up and the driver attempted to use the other charger. He asked me for some help - and of course it was just about the time my wife called me to tell me her flight had arrived. He was down to 10 miles of range, and there are no nearby Superchargers. He also had no idea how to use EVgo, their chargers, had no account, rfid card or phone app. Just a credit card. We couldn't get his credit card to work. So I finally offered him a complimentary charge. (He offered me some cash in return, but I wouldn't take it.) My authorization of course worked, but then there was some sort of connection problem with his Model X. (I didn't have the presence of mind to write down the error message on the charger display.) We then tried moving his car to the charger I just used. Same error and so it still didn't work. By this time, my wife was "patiently waiting" for me to pick her up and I Really Had To Leave. He was going to try calling the EVgo support number, and I also suggested calling Tesla roadside help. In retrospect, I should have also looked at plugshare - as there are a number of L2s near the airport that he could have used.
Reflecting back on this, it raises some points that could bear discussion.
First, given these EVgo stations show up in the Tesla nav display, I wonder if many Tesla owners show up at an EVgo expecting the same "plug and charge" experience they do with Tesla Superchargers? If so they likely going to have a bad experience.
Second, I guess we should all be aware that if we need to use one of these, be sure to have an account set up with EVgo. I used a AAA discount when I set up my account. So there is no monthly charge, and it gets best pricing. Don't depend on it reading your credit card.
Third, speaking of "plug and charge", Tesla doesn't support it yet with non-Tesla charging stations. Hopefully as Tesla gets more comfortable with CCS, they will start to support it. Googling around a bit, it seems EVgo supports P&C on the CCS side of at least at some of their stations. But not on the CHAdeMO side.
Fourth, it will be interesting to see how EVgo manages a transition to a CCS-based approach. Seems like they need to stick with CHAdeMO for at least a little in order to remain compatible with all Models S/3/X/Y.
Finally, as a FWIW, the charger display was showing ~45-46 kW of power being delivered during much of the charging sessions. However the in-car display was showing ~40-41 kW. I'm assuming that the missing ~5 kW was probably battery heating (e.g., stator winding in the rear motor drawing ~3 kW) and cabin heating drawing a few more kW. I probably should have turned the cabin heater off to see if it made much of a difference.
