I have never seen one of these panels up close. Can someone helpful tell me exactly what substance is sustaining that level of combustion? Is the backing to the panels a polymer?
I don't know the exact Trina solar panel construction, but in the sandwich the mid sheets and back-sheet are plastic resins.
EVA film (
Evathane, Luperox) ethylene vinyl acetate seems to have a low melting temp. 71°C and no mention about flammability.
Back Sheet
Tedlar/PET good to 107°C and no mention of flammability.
I'm assuming a hot spot on the panel starts the plastics on fire, and it spreads to adjacent panels. The field wiring should be UL-94 for flame travel like most electrical plastics.