AC/DC compressor refrigerator vers just DC

[Steveva]

Need to and want to replace our Dometic RM 8500 3-way as parts are very difficult to find. Thinking of using an Isotherm Cruise 130 as it will easily fit. The big issue is the width needs to be under 20.875 wide. We have been using our van at sites with electric hook-ups only as our current battery capacity is low and I've noticed the compressor refrigerators are specified as DC and some as AC/DC. If we are plugged in or traveling the DC fridge is going to work using the battery. What is the purpose of the AC/DC fridge? After replacing the fridge we will replace and upgrade the battery, the charging, the inverter and add solar. Current battery is a size 24 lead acid. We have a 2011 Pleasure Way Excel on the Ford E350 with the V10.
Thanks Steve