The strongest solar storm ever known happened in 660 BC and showed up in ice cores and tree growth rings. Extreme events like these are known as Solar Photon Events, and they are fortunately rare. Scientists are studying them to help limit damage to electrical infrastructure, and to anticipate the chances this will occur
Image from this article
https://www.sciencenews.org/article/one-strongest-known-solar-storms-blasted-earth-660-bc?utm_source=Editors_Picks&utm_medium=email&utm_campaign=editorspicks031719&utm_source=&utm_medium=&utm_campaign=
We need to be aware of the levels of energy that reaches this planet in a strong Solar Photon Event, to allow us to modify our electrical grid and communication systems to absorb the insult without damage!This is an important redesign, and it needs to take priority and e folded into the system as soon as is possible! Damage from this type of solar event could currently take years to totally repair! This is an unacceptable risk, that must be addressed, before we are in the dark!
Article on the worst solar photon storm in recorded History:
https://www.sciencenews.org/article/one-strongest-known-solar-storms-blasted-earth-660-bc?utm_source=Editors_Picks&utm_medium=email&utm_campaign=editorspicks031719&utm_source=&utm_medium=&utm_campaign=
You can see that this event was large enough to effect all the planet, but did little damage to the power grid that did not exist back then. That would not be the case today, such a storm would be devastating today, and we know it is coming! We must prepare for it, NOW to avoid hard decisions later!
Here is a professional Journal review of the same event:
https://www.pnas.org/content/early/2019/03/05/1815725116
I plan to go off grid, and I am adding surge protection to my off grid system. I recommend you do the same thing! Gas discharge spike limiter tubes set at 150% of panel voltage will help, and shielded or conduited cable runs will offer enough protection to save your system.
It will be more difficult if you are grid tied, consult with a professional!