Amphenol UTX was subject to
recalls in late 2016, vendor contaminated plastic which cracked and allowed moisture ingress and shock hazard. Tesla is right to implicate them.
The industry has too many different proprietary connectors that come with the panels. They all just might plug into each other... and there's no safety agency approvals or tests on how they do when cross-mated. It's a mess.
There are some junction boxes with MC4 on there, I think it's convenience to have the connector on flying leads.
The panel junction boxes seem to run hotter than everything else?
Here are thermal pics taken from
photovoltaikbuero which show a shorted bypass diode, and an open string within a three string panel.
The open string runs hotter- which is counter-intuitive:
"In order to understand the image, keep in mind that solar cells in an open-circuit state are about 2-3K warmer than cells operating based on maximum power point (MPP). This is because, in an open circuit, all of the solar energy that’s not reflected from the panel is turned into heat in the panel; in the case of MPP, on the other hand, some of the energy is drawn from the panel in the form of electricity. As paradoxical as it may seem,
this current leads to cooling. Unlike in the case of a short-circuited bypass diode, for this fault you won’t see the typical image with some much warmer cells, like in the thermogram above. Here, all cells in the affected area are equally warm, and the panel socket looks much warmer than its surroundings."