They get expensive - its not just the arrays, you'll spend as much on the install as the arrays, and probably about that much again on other supporting hardware and batteries. SW US is most efficient place for solar, even FL not that great. Depending on your location and needs, $40K - $100K to go off system, especially if running a small grow room. Turbines high too - but efficient in Rockies and most of the Midwest. Tens of thousands.
You can always start small to offset a small portion of your use. And some States help, but nowhere near price parity with regular old elecricity.