I replaced mine with one of these.
https://www.dometic.com/en-ca/outdoo...rx-80s-_-30979
It was a tiny bit smaller than the hole of the unit it replaced so some wood frame had to be added.
I have a 100W
solar panel and a 100Ah Lead acid
battery and it seemed to work fine for my weekend camping.
If you were doing more long term camping (ie not charging the
battery and/or running the fridge off off the tow vehicle power every few days), and it was cloudy for a number of days in a row it wouldn't be enough to keep the fridge running though.
I'll be upgrading my power storage a bit for this upcoming season but the fridge itself is very nice and draws little power. About 250-350 watts for 24 hours depending on season/weather.