I lived on solar/wind for 20 some years. Your estimate of 120 watts is under by at least a factor of three, or at least you'll get there by trial and error over time, and that will be more expensive than doing it right the first time.
JD is right on the propane reefer. For the el. part, carefully spreadsheet the watts to be drawn against the charging capacity, being sure to include 20% charging inefficiency loss and to account for the diurnal effects of charging along with the % occurrence of heavy cloud cover.