One other thing another commenter mentioned that I think bears repeating here for posterity is that the EV6’s OBC is not limiting voltage input and the 10.9kW rating on it has probably more to do with the difference between the North American commercial, North American residential, Korean, and European nominal voltages which range from 208-240. At 48A, the 10.9kW number is a lot closer to the 220V standard in Korea than the 240V my house gets.

Thanks for taking the time to reply. I’m sorry I wasn’t clear enough in my question. Other replies have seemed to understand what I was getting at. The only reason I mentioned the PHEV Niros was because I was trying to provide a backstory for how I ended up with an EV6 in my garage on loan, and also so nobody would wonder why I had two Wallbox stations in power sharing mode. I guess I could have simplified the whole thing by not mentioning the PHEVs and the dual EVSE stations, especially since none of the really good replies are pointing to the power sharing setup as a potential cause.

Thanks. Your comments are consistent with others, and I think the ~300W loss is probably mostly to heat, especially since it seems to increase at an exponential rate between 30 and 48A. Another person replying told me that heat is squared in proportion to current so that makes sense. Since you have pretty much the same hardware, do you know if the car (as reported on the dash) is measuring the charging rate before or after the OBC?

Thanks for that. I’m not an EE, so I was unaware that heat rises exponentially with current.

I definitely had things done right with my home install - dedicated circuit, licensed electrician, etc. I was looking forward to testing out my setup at 48A, which I’ve now done for a few days.

I haven’t had any sessions longer than about two hours at 48A, but both my system and the EV6 performed flawlessly. I’m going to conclude from your answer that I’m simply losing ~300W at 48A to heat. It’s hard to tell if I’m losing it before it gets to the the OBC. I wish I knew where EV6 measured it, before or after the OBC.

US Here