Update from Japan: yesterday and today, I've charged at two of Japanese highway plazas (short road trip to hot springs!), they are both Nissan Slim chargers which are NOT compatibe with Tesla. However, they usually charge a bit and disconnect, sometimes charging lasts more than 20 minutes, so both times I gave it a try. Yesterday, I got 70A (approx 25kW) at Typical Range 210km (which is approx 131 miles Rated), and today I got 70A at Typical Range 124km (77 miles Rated). They charge approx 25kW, which is too LOW for 44kW chargers. I know these installations are 44kW.
I called Tesla SC in Yokohama and found out the following:
- All Teslas (forgot to confirm whether they are all or Japan only) are limited to 25kW if we encounter Nissan Slim chargers, by firmware
- The reasoning was to prevent overheating of Nissan chargers and to protect them (??)
- They said the power limit is not relevent to CHAdeMO incompatibility
I asked them to send me an official email from Tesla to explain the following:
(1) Give me the resolution to charge at 44kW at highway plazas, there are no superchargers on route. Tesla could have "allow list" for charging at 44kW, or they could allow me to downgrade the firmware. Also, if they don't allow me to charge at 44kW for some time, refund me per-minute charges I paid to NCS (Japanese ChargePoint-like company), as I expected higher charging rates.
(2) Give me the reason why Tesla decided NOT to tell owners about this (70A limit firmware change) in advance.
Fortunately I had enough range going back home, and there are many other charging options off highway, it makes me sad to spend 23 minutes and getting only 41km (25 miles) of range. Yes, on the way back it gave me TWO errors during the charging session, once after approx 20 minutes and next after 1 minute. I resumed again and after a few minutes everybody came back to the car (nature break and bought coffee etc) so I disconnected.