We are in the process of looking for and buying a sailboat. Being neophytes we don't know how to rate existing electronics on a used boad. We have been looking at boats with and without solar panels and wind generators but don't know what their lifespans are. Same with Autopilots, sails, rigging, GPS, chart plotters, etc., etc.. Is there anyway of finding this stuff out or is it just a hit or miss situation. Should it be discounted from the sale price of a boat or do you accept it as an incidental cost? Any help would be appreciated.