Fronius solar data interface, Code availble...
Some time ago someone asked about code fore the Fronius data interface. Fronius did not make the protocol public.
Fronius now has some example code for communicating with their inverters. So I assume most or part of the protocal is public.
http://www.fronius.com/cps/rde/xchg/SID-D35DBEDE-796C98EA/fronius_international/hs.xsl/83_8594_ENG_HTML.htm
Cheers