Think of a resource as something useful that can be extracted at less cost than it is worth. It is a good definition of resources.
Solar panels require energy to be made, and they have to be maintained and have a lifetime. Solar is much more expensive than coal or oil right now. Eventually oil and then coal will rise in cost to the level of solar, and probably solar will become somewhat cheaper although it has remained at the same cost for a decade now.
When solar is competitive with oil and coal, energy will have become so expensive that the rest of the industrial economy will be in trouble.
You're right about the cost of producing the panels. All good points for me to think about.