This turd smells like the solar roadways - it's subsidies, politics, lease/loan/purchase power agreements and business deals that have nothing to do with reality.
Panels from Trina and Yingli solar china, $0.75B state subsidies to SolarCity who is $2.9B in debt 2016, Tesla buyout for $2.6B as investors complain amidst serious conflicts of interest.
US Trade ruling and Trump order added tariffs 30% (-5%/year) on imported solar cells and modules. You can't wave a magic wand and expect to hire thousands and be producing solar cells in America, especially when china produces 71% of the world's panels and 60% of the world's solar cells.
I think Gigafactory 2 in Buffalo NY, "producing" solar roof tiles, it was Panasonic imported cells and not sure if they actually make any of the cells yet in NY. Musk demo'd the glass shingles that couldn't even produce electricity. An ounce of image is worth a pound of performance.
All the SolarCity installations look very shoddy, plenty of youtube vids that show a rushed, inexperienced crew, as if plumbers did the work.
I think the back sheet/laminate on the module is a little too flammable and only 90C 12AWG wire.
Fuses are Trina recommended (to 20A)
only to protect the reverse-diodes, they do not seem to be for anything else.
https://www.bloomberg.com/news/features/2018-11-20/inside-elon-musk-s-forgotten-gigafactory-2-in-buffalo