This might sound stupid, but why can't you get a gas powered generator and drive it with wind instead of the engine? Would it not get to enough rpm to generate any usable electric? You can pick these up cheap at swap meets, when the engine doesn,t run. Looks like it would already have a lot of the electrical components in the panel. Could you rig some kind of automatic disconnect in case the grid went down and diodes so juice could not backfeed from the grid?