Dart Solar: Charging Your EV Straight from Solar Panels

There is also a Reddit thread with more details: https://www.reddit.com/r/TeslaLounge/comments/194ajsm/my_tes...

The common questions/answers seem to be;

1. How does it work? > Solar panel (DC) -> MPPT (DC) -> Small 1kwh Battery (DC) -> Power Unit (AC) -> Rivian charging adapter -> Into car

2. What is the efficiency loss? > For Beta2 so far it has been minimal. I haven't formally tested it, but it is the same loss as when you install the roof rack. I get about 320 watt / mile.

I don't get anything near 320w/m - even in full-on winter weather, so I have no idea if that is considered normal.