Just a quick note:
Amorphous silicon solar panels, though their output is significently lower per square metre, are not so immune to the shadow problems, and are capable of charging in cloudly conditions rather than requiring direct sunshine.
Solar technology has vastly improved over the last 5 years.
Wind Generators: I found that the small Rutland (model 503?) failed to 'point' properly on a pitching CO26, very rarely charging except for when in harbour. Not ideal! I'm not sure whether it was a balance problem with the vane vs. prop, or whether it was more fundamental - that the undulation of the boat was making the mounting pole swing round in a cone thereby 'spinning up' angular momentum...
They also generatre horrid amounts of MF noise - ruining Navtex reception. And can't be stripped away to reduce windage for Storms.
My next investment will most definitely be in Solar.