[baddox]

You mentioned the reduction in your energy bill, but do you happen to track how much of that comes from selling back to the grid and how much comes from you using your solar power directly? If you're generating 10kW a few hours each day, I would guess that's the only time you're selling back. Would there be any point in an energy storage system for you? I've always had this fanciful notion of having a solar array and building an underground flywheel for storage, but only because I'm riveted by flywheels.

I haven't looked into the ROI of CFLs or LEDs vs. incandescents in a while. I imagine they have improved. Lately, I've even seen some LED bulbs in stores that don't look horrible. Of course, I would buy them anyway just to save time changing bulbs!

[secabeen]

I have a similar system, and I sell back for about 80% of daylight hours. That credit covers all of my other needs in the summer (and then some), and about half of my usage during the winter months. When you originally design the system, you use current rates and policies to create a system that generates at most a net zero usage.