I agree that there's a limit to how strong QT powers can get, there's different levels of QT in the first place. But we don't really know the limit yet.
For the sunlight melting Nerval's Overfreeze, it can be that the photons of the sunlight was adjusted to the same phase as the ice. Since Sakura understood and bothered to explain the phase transition being an important factor to the freeze being indestructible, she probably has to deal with it as well.
Seeing how QET is adapted in every single piece of technology in the Sorakake world, the solar panels being able to adjust the phase of photons wouldn't be impossible.
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