[LMagic007]

Well I guess one could guestimate this scenario. Hypothesise a scenario of 9000 x 200 watt Panels x 5 average full sun hours a day is 9,000,000 watt hours being 9,000 kwh generated per day. If electricity costs 14c per kwh that's a daily saving of $1,260.

Consider that might be about the cost one 1 solar panel, including installation costs. Thus each day one panel is cost recovered. Hmm this suggests 9000 day cost recovery being 24.65 years being about the useful life of a typical solar panel.

To be truely green you would need to add the carbon manufacturing footprint greenhouse gas recovery period.

Just a thought.

The Kyocera KC200GT suggests a 25 year useful life with output loss of no more than 20% within 25 years of purchase date. Thus some payback may be diminished, but with tax right offs, you would probably replace them well before 25 years, so it sounds like a fair deal.