Question: Impact of EMP on Solar PV

[Skvez]

Let me preface this answer by saying I don't know for certain but I'll give you my 'feelings'.

As with all things related to EMP it depends on the strength of the EMP and the amount of coupling onto the device. There isn't a clean "safe / at risk" categorisation.
Transistors are damaged based on the amount of energy dissipated across the size of the PN junction in the transistor. Since solar panels are just really big (in terms of semi-conductors) PN junctions they are probably much more robust than other electronics.
I therefore 'feel' like the PV panels themselves are "low risk" from EMP.
The charge controller is probably "medium risk" as it's semiconductors are much smaller area and therefore more vulnerable, I don't consider it "high risk" as the runs of wiring connecting to it are relatively short and therefore won't pick up as much EMP field.

If I knew there was a solar flare scheduled to hit the earth I'd be disconnecting the charge controller and possibly putting it in a faraday cage for the duration. I'd probably not be trying to do the same with the PV units themselves because they are harder to get to (typically roof mounted) and physically bigger (harder to make a faraday cage for).

That said I should probably put a small PV panel in a faraday cage just in case.