I was up 8% over September 2011 for the old panels. (With my new panels the total increase was 221%.) June, July, and August were cloudy down months here so it is nice to see September be a bit of an improvement over last year.
Sept 2012 • 104 kWh (with new panels, 308 kWh)
Sept 2011 • 96 kWh
Sept 2010 • 112 kWh
Sept 2009 • 95 kWh
My solar year runs October through September and was 1234 kWh for the past year on my old array—the highest ever—and 1992 kWh including several months of the new array. The new panels ought to cover all my LEAF driving, the old panels about 60% of my household usage.