We've got a 30 panel system with 16 batteries and a generator for backup. Completely off the grid. I don't have all the info with me, since I'm in the city right now, but I can get whatever info you're interested in our system when I return.

Also, while several have noted the required maintenance for the panels, if you don't have a grid-tie system, the battery maintenance is much more labor intensive: maintaining water level, pH, doing equalization charges, etc... you'll see far more degradation from your system from not maintaining the batteries than the panels.