I used the 38-litre box in my camper last autumn in the south of France, and it needed between 200 and 250 Wh per day (24h), depending on the outside temperature and beer consumption. Peak with approx. 30° in the camper was 300Wh/day. According to the manufacturer, the 58-litre box should need even less power than the 38-litre box.

I own this cooler and I theoretically own a solar system, but I have never run it like this.
My box is available for testing purposes.

0795318621