I'm currently living in a 5th wheel during the week for work. I'm 25 miles from any ice of any significance. I have been trying the ice cooler method, but by the time I get enough ice in there to keep the 130-degree car temperatures at bay, there isn't much room left for all the produce I need to transport back home 180 miles away (and soggy produce is less than ideal as well). I even tried dry ice once, but even with a towel between it and the food, some of my veggies and fruit got frosty. So my options are to either drive back to my 5th wheel after a 10-hr work day, adding another 30 minutes of driving, and then drive 3 1/2 hours home, or to figure out how to power my Engel cooler while at work. I have also considered the solar panel option. A panel in my front windshield area may be possible. Too much dark tint everywhere else and leaving the panel outside the car isn't an option. I think I'll look into the solar panel idea a bit further.