I bought the chill more or less to take on picnics. Then I was recently hit with a black out . The cooler kept my food from going bad. At first I was able to run my cooler off of a gosun battery. The battery lasted a lot longer then I ever expected. After the battery died I ran the it off of a larger solar battery. The reason I didn't go immediately to the larger solar battery was because I didn't know how long I was going to be without electricity. It turnout more then 24 hours. Thank you again.