Size of boxes to be refrigerated and desired box temperatures will determine daily amp hours required while cruising in Bahamas. Worst case 10 amp-hrs per cubic ft of refrigerator box and 20 amp-hrs per cu ft per day for freezer. If alternative energy is from solar power 50 watt panel per cu ft of refrigerator per day. See and do math on my web site Slide Show. Remember this projection can be reduced by subtracting 2% for each degree of cooler climate conditions. Base worst case conditions used were 90 degrees air and 89 degrees F seawater temperatures in Bahamas waters.