I got a 30 panel system this year, 13.4 kW, for about $3 per watt, maybe it was a tiny bit less. Not cheap, but could be a lot worse. Don't go with big companies that advertise. The gross cost for me was under $40k, but after 26% tax credit, and the sale of SRECs for around 11k, my net cost was about $16.5k. Not cheap of course, but my payoff is 6-8 years which isn't bad at all.