Greetings: I want to put a small refrigerator in my boat, and I'm looking at a product called Engel. I need to budget the size of the fridge I buy based on my solar capacity. The Engel folks are good enough to provide nice graphs of the performance of their products at various dial settings and various ambient environments, but the graphs only apply to an empty box. That's fine for people who want to have a box full of cold air, but I'm thinking of actually putting groceries in there!

So I'm trying a shortcut here, because I don't want to try to actually calculate heat loads: instead, I'm looking for a sanity check, and I would be surprised if everyone on this forum wasn't able to give a pretty good answer right off the top of his or her head.

The size I'm zeroing in on is about 60 quarts, or 2 cu. ft. Let's say their unit can keep an empty 2-cu. ft. box at a steady 33F using an average draw of 3 amps. What's it going to be (roughly, of course) when that box is full of food?

Thanks,

Greg