I found this page (thanks to Gasper
) about a similar set-up which uses even less power - 90 Wh per day instead of 103 Wh.
Low power chest refrigerator
The difference here is that the fridge has thermal mass inside. Not just bottles of water like everyone does, but bottles of
olive oil. Why? Because olive oil freezes at refrigerator temperatures, so the phase change stores more thermal energy than water does at that temp. This allows the compressor to be turned on only once a day for 30 minutes.
I started a new
thread on phase change materials to keep this thread from getting too far off topic.