Solar Panel Discussions

how efficient must Solar Panels become to break even on the cost of materials, manufacturing, disposal, etc.?

Consider the energy cost of materials, manufacturing, marketing, maintenance, and recycling or disposal vs the energy produced in a sunny location over the useful lifetime of the installation. How efficient must PVs become to break even?

I think you are asking about EROEI- energy returned over energy invested. Do some searching with that term and you will find what you are looking for.