Any idea how the price is calculated in terms of KW-H? Is there a system lifetime used? Is the builder going to be the owner and then agree to sell at the KW-H rate?
I'd like to know that, too!
I could understand saying that a particular rooftop solar installation has a nominal (= rated) capacity of 100 kWpeak (given a solar constant of 1.3 kW per sq. meter, and a conversion efficiency of, say, 10%, that works out to roughly 800 square meters - plausible for a large office building), and will harvest an estimated 1 million kWh of electricity over its unit life, meaning that it must operate over an equivalent lifetime of 10,000 hours at full capacity (given an average of 2 hrs of full sunshine per day, that corresponds to an actual lifetime of approx. 5,000 days = 13.7 years), before it has to be scrapped and replaced.
If such a installation had a total cost of $24,000, that works out to 2.4 cents per kWh.
But I can't image an installation that size costing only $24,000 - not if you include installation costs, maintenance, etc.
Regards,
This was a "back-of-the-envelope" calculation with a couple of hidden - if plausible - assumptions, so don't get your undies in a knot if it's off by 50%.