I purchased a 3k system. I have 40 panels total. Each panel is rated at approx 70 watts. The panels produce DC power that runs into the inverter. I got the Xantrex GT3.8. That is fed into the power coming into the house. The way it works is it should suppliment my power usage. I am currently paying a flat fee of $170 a month. The solar should drop the price to about $75-100 a month. Of course I won't know until it up and running.

n2