I just got the electric bill and we just barely missed having a bill with 100% of our consumption being self-produced. We got billed $0.49 for 6kWh. That’s just three sunny hours we needed.
Generally over the past 10 or 12 weeks though we’ve been right about at 100% depending on which specific day range I use to calculate. The super hot spell of weather we had dropped output by about 20%. This last week we’ve had a pretty strong marine layer which made for an even larger drop in output. All in all though the system’s great!
I really like this graphic:
August 2008 to August 2009 household average daily electricity consumption