A state of non-function, not a state of being destroyed. My bad on the title.
https://i.imgur.com/nj8Vzza.jpg
https://i.imgur.com/FIVerPG.jpg
The top panel that is dead and stuck at 15*c was created by making a copy of a dead panel from my main array. The bottom panel that is correctly generating heat was placed by hand.
This really messed with me because a very large portion of my primary solar array somehow ended up in this dead state. I was copypasting ghosts which where being placed by the construction drones mod. Copypasting functional panels results in ones that work correctly.
Connecting a dead and a live panel will cause the dead one to warm up but it still will not produce anything.
I'm playing the Project Corona modpack. https://mods.factorio.com/mod/project-corona