Throw in the aging of panels, storage mediums, distance from storage, etc., and it just isn't worth it for non-specific, non-tuned applications.
Solar? The next shale? NO. Even in a theoretical 100% efficiency you still only achieve 50% for daylight. Add in the loss of direct light to 30% of the time the panel can run at full efficiency. Then throw in rain, clouds, fog, snow, etc...
AND to top it off there is only so much energy that hits the earth from the sun.
The cost of building the panels, installing the panels, and the fact that the energy needs to be stored in some way doesn’t make any sense. Unless, of course, you are a politician spending other people’s money.