I've ended up using the mobile charger quite often as I've been spending time in a few places that have NEMA 14-50 plug. What I can't figure out is how Rivian determines the default charge speed. I notice a lot of time the charge speed defaults to 16A, but other times it remembers my last setting and usually there is a max but the max is lower than 48 A and it tends to vary. Yesterday when I charged up it went up to 34 A before the "+" button was grayed out. Today it was at 30A. This was on the same circuit both times which has a 40A breaker (so technically I shouldn't go past 32 via the 80% rule). But somehow the charger seems to sense this and limit current draw. Is it somehow detecting a drop in the line voltage? Once or twice I noticed at home my 30A circuit it would let me go all the way to 48A and actually defaulted to that before I turned it down. In short I can't figure out how it is determining default and max current. It's clearly not random but seems largely unpredictable and in some cases unsafe - I have never been able to charge at 48A anywhere so I was surprised to see that current be the default at least once. I didn't wait to see if it would throw a breaker or reduce the current on its own.
I've also used a J1772 (Nissan Leaf branded) and it would only let me go up to 30A charge speed. I assume this max speed is somehow communicated via the J1772 standard. It was 30A consistently every time I used the charger.
I've also used a J1772 (Nissan Leaf branded) and it would only let me go up to 30A charge speed. I assume this max speed is somehow communicated via the J1772 standard. It was 30A consistently every time I used the charger.