Adding another 20 -- 300w panels to my system over the last few days (windy as heck today trying to mount them) Panel prices are amazing. The ones (175w) on the trackers on the right side of the photo (directly above greenhouse) we $4/watt in 2007. (which is why trackers). The ones I just bought were $0.63/w. Amazing. Got all 20 mounted, but it was almost dark, so I didn't get a shot of the finished install.