I run a Dometic similar to this in the back seat of my truck, and also a Nova Kool 3.5 cubic foot in my popup truck camper. Back seat cooler/freezer was very handy in that I didn't need to raise the camper top to access the refrigerator while traveling, so I could shop for groceries and keep drinks cold during the day while driving.

I have 525w of solar, and two 100Ah LifePo. Last year I ran both fridges 24/7 for 5 months while camping off-grid in Mexico. Lots of sunshine in Mexico, and ambient temps were warm.

I didn't need to plug in once and the batteries never discharged more than 35% in 5 months. Also ran fans and lights and charged phones and laptops.