We've sold some high speed IR/convection dryers to the solar manufacturers over the years. Here is the inside skinny on solar power:
1. With government subsidies of 50% of purchase price, pay back (average household use and kw-hr cost) for the panels alone is 25 years.
2. Solar panels last 18-20 years.
That is all.
Solar panel cost WITH subsidizes ONLY, does not include inverters, installation, or batteries if used (battery life is about 6 years average).