From page two of the FDP's political platform on environmental, agricultural, and consumer protection issues:
"We will continue to promote the expansion of renewables in accordance with current targets, retain the Renewable Energy Act and the unlimited feed-in priority, and make these subsidies more efficient."There are a number of other points, but I won't go into them -- you can see from the above how much things require explaining. For instance, the "unlimited feed-in priority" means that renewable energy has to be accepted on the grid; if necessary, coal, nuclear, and natural gas plants simply have to be ramped down. (The part about making feed-in rates "more efficient" is a bunch of blah blah blah.)
Most importantly, this paper -- which is apparently being used as a basis for coalition negotiations with the CDU (it was sent to me by email; I do not know if it is available online) -- clearly states that the FDP will retain the Renewable Energy Act.
I could not find the word "solar" or "photovoltaics" in the document at all. Otherwise, the FDP only emphasizes that Germany has made too many mistakes in the field of biomass/biofuels, so support will be increased, and too little has been done in the heat sector.
If you were expecting an attack on solar, the document is disappointing.