[rames14]

On the low end, according to my web search, a refrigerator uses 404 wKh per year, or a little over 1100 watts per day. Ohms law (watts = v x amps) shows 1100/12 or about 92 amps per day. A group 31 AGM battery is about 100 amps, 50 amps usable. Two batteries gives you 100 amps usable. On 100 degree day (you probably won’t be at Walmart), you could be close. Best of luck.