I did dig out the certification process and it does appear they are leaning toward grid tied systems but they do recognize stand alone systems for off grid applications. I am now trying to see if you can do an "off grid systems" to serve selected loads in a house on the grid.
This is the process in Florida if anyone is interested.
http://gfretwell.com/electrical/solar%20pv%20approval%20process%20Fla.pdf
