All I was saying was that the effects of basically a nuclear winter (volcanic ash) will nullify solar panels, that’s all.
There’s always some scenero that some things won’t work in. This systems would be good after a huricane, earthquake, EMP attacke(provided you protected your equipment), power outage caused by storms, etc.... Again I’d say its better than doing/having nothing.
You are looking at a very, VERY small chance of a volcanic eruption of that size. Even Yellowstone's biggest wouldn't have nullified solar panels. Most contingencies preppers like myself prepare for are far more likely events from storms and other generally short term serious disruptions. For those events, it would be money well spent.