US based First Solar was the second largest solar module manufacturer in 2012.
From Reuters, 4/9/2013: First Solar soars 45 percent on outlook, acquisition
"(Reuters) - First Solar shares logged their biggest ever one-day jump on Tuesday after the company said revenue and earnings for the next...
I turn it off when parking in the alley behind my house late at night as a courtesy. My neighbors don't need to hear the reverse beep, and the situation is such that there's no way I'm going to be surprised by pedestrians or kids. Same thing early in the morning.
Sunpower makes a 320 Watt panel that's essentially the same size as the Leaf roof (that's a 19% efficiency panel). San Diego gets 5.5 hours of usable sun a day. So that's 1.76 kwh a day, or just under a fuel bar.
That's not insignificant! Sure you can't recharge in a day, but that's 6.5...
When I had the firmware updated last month they put about 10 miles on the car (test driving after the update I assume), and managed to dirty the seat (easy enough, given the silly light cloth). When I originally bought the car it had 4 miles on it.
So my guess: your firmware was updated.