I read something about this a little while ago - if I recall the analysis correctly the energy payback was in the order of 1-2 years for the average (300W or so

I read something about this a little while ago - if I recall the analysis correctly the energy payback was in the order of 1-2 years for the average (300W or so) panel. Not bad for a 20 year life, but we will need recycling advances in the meantime as we will have so many panels reaching end of life in the next decade.