1 If the patent application was filed on or after June 8, 1995, the starting patent term is 20 years. 2  This accounts for the vast majority of patents in force today. 3  The 20 year term is calculated based upon the priority filing date, not counting provisional application or the original filing in a foreign country.
The report indicates that the median installed price of PV systems completed in 2012 was $5.30/W for residential and small commercial systems smaller than 10 kilowatts (kW) in size and was $4.60/W for commercial systems of 100 kW or more in size.
for example the total average cost of an installed residential pv system under the california solar initiative is $ 8 70 per watt including installation as of january 2011or example using the clean power estimator a south facing three kilowatt system installed at a 30 degree angle on a single family home with a utility bill of $ 180 per month in san francisco would cost a customer an estimated $ 19282 with a payback period of 12 years