A typical system (without battery backup and a few other goodies) will go about $4-5 per watt, plus installation.
Hmmm, $4-5/watt rated?
I am asssuming a rated watt equates to 6x30x12x.5=2200wh/yr or 1.1kwh/yr. Correct?
So for $4, you get about 10 cents of electricity per year. 40 year payoff period.