Sorry for the long absence, but I wanted to give another update on my solar panels:
My system has been active for over 300 days (closing in on my first year), and I've collected a lot of data.
I've been through 10 billing cycles, and I did my best to calculate my savings (basing them on the amount I saved by buying a portion of my power at a discounted rate).
From what I estimated, my monthly savings so far have been (approximately): $75, $74, $76, $89, $54, $20, $13, $15, $13, and $23.
If anyone is interested in finding out more, please let me know (full disclosure: SolarCity has a customer referral program through which I earn a credit for bringing in new customers).
--Noam