Hi,
I have a 2.86 kW system from Skyfire. It has 11 Conenergy panels and 11 Enphase microinverters. It cost $13,444 all in, including some extra cost to provide specialized hardware for my clay tiles. My house faces East/West and although originally we were talking about 18-20 panels, they determined that any additional panels would be significantly less efficient (heavily shaded) and not as good an ROI. I guess to put it another way if I doubled my current number of panels, the increase in yearly production would be fairly pitiful comparative to doubling the cost. I still have the option to increase and if I get rid of my chimney I could add a few more. Skyfire did a great job ultimately but it was a very very slow process. Looking back on this, I first asked them about quoting in September 2014. It took more than a month to get a quote and then I immediately put down 50% as requested to get the work done. When the system was finally handed over it was May 1, 2015. In other words, they had my deposit for about 6 months. To be fair, it was winter but nonetheless I had to chase many times looking for updates etc.