After losing frozen foods twice, we finally put in a solar panel and a better battery. So far it keeps it running even on cloudy days. We keep the RV loaded so we can jump in and take off whenever to opportunity comes along.
Amazon hqst 100 watt 12 volt monocrystalline solar panel kit with 30A PWA LCD Display charge control. 174.99
Cliff installed it, but you can text him at 919 345 9576 and he can ManSplain all the text stuff. I like it cause it's shiny.
When we are staying with family in New Orleans we park the RV at a different location without plugging it in 2 power.
The battery ran down and the frig was off. We didn't go check on it every day, so we ended up with soggy food. We put in a better battery and it holds the charge. Even cloudy days make enough charge.