Dave I live in New York. I got back $14,000.00 from the power company and $6,000.00 from the state and federal Govt.
Each panel is rated for 179 watts and they are in series.
The system is warranted for 25 years. When the sun is out on a great day the system has a readout and it is generating 4,000 watts at that time. If a cloud passes the output drops. On a rainy day it still makes about 200 watts.
It usually generates about 3,200 watts which is almost the amount of power my house is using if I don't have any air conditioners on. So on a really sunny day my electricity is free while the sun is out. Of course at night it doesen't work.
It also doesen't work during a blackout. It senses the power from the power grid and turns itself off during those times so I don't shock the guy working on the lines.
I installed the entire system myself in 4 days.
Before you buy a system, the Solar company gets you a letter from the power company stating exactly how much rebate they will give you with in 90 days of system completion. They also tell you how much the Govt. will give you back. It is determined by how many watts your system is rated for.
The power company then changed my meter (for free) for one that turns backwards when I am generating more than I am using there by reducing my bill.
I will never get totally free power because my roof is not large enough but if you have spare land, you could generate power to supply the grid and the power company has to pay you for it.