Check this out.
I called today and they're giving me credit for my HOMEBREW panels, that's freakin unbelievable! I give them a receipt for $425 of raw solar cells and they send me a check for $1000. They're also giving me credit for the 160W of BP panels I have on my garage. I'm looking at almost four grand now.
I've got to maintain this system for 20 years but what the heck, I was going to do that anyway.