AH draw of compressor fridges varies a lot, depending on how well you insulate it. 70 AH for 3.7 cf is a bit on the higher side. These 12V units come from the factory poorly insulated, Canadian manufacturer Novakool recommends adding 1.5" or 2" thick block foam.
Old and low-end 110V units from big box stores are terribly inefficient, plus added 10-15% inverter losses. They've been getting better in the last 4-5 years though.
Weatherman rules, yes. AZ in January is about same good as Southern BC in May because chances of rain are lower. At Lat 27 in Baja on a good day in January my flat 490W collects - don't even know, must be upwards of 90 AH but I don't use that much, batteries are floating by noon. In low overcast with no blue sky and 50% rain it barely collects 25-35 AH by the evening, but... there is hardly one bad day a week there. In BC in May you sometimes have WEEKS of rain.
