But of course in the case of an RV where you are on a car battery Most RVs have a "house battery" that usually dwarfs a car starting battery, usually multiples

But of course in the case of an RV where you are on a car battery Most RVs have a "house battery" that usually dwarfs a car starting battery, usually multiples. But even then, running a compressor fridge takes more battery than our little RV has room for (including the roof space for solar to refill those batteries). I think that's a lot of the reason you see compressor models primarily on larger/more costly rigs: they've got room for the batteries, and they don't boondock much. Lithiums just save weight and space (more usable electrons in the same size). If you've got a Class A (rock band touring rig), just line that thing with as many lead-acids as you need. Which is what the manufacturers do; I don't know of a single company installing lithium batteries stock.