Originally Posted by msturtz
I guess I didn't include a 14 year old unit in my definition of modern. It is possible that there are 12VDC heated absorption refrigerators the real problem is current draw. Ohm's law applies 100 amps * 12 volts = 1200 watts. You need a large battery bank and large wiring to connect to it to get sufficient power to run an electric element for an absorption refrigerator. Now that inverter technology has advanced it is cheaper to run an inverter and use smaller 120 vac wiring.
2000 "vintage", not year 2000. 12 volt elements go well into the 2000's and I'm certain are still used by many campers.
Power efficiency of a 12 volt heater element for an absorption unit is not a factor when connected to the tow vehicle. The tow vehicle charging system is essentially an unlimited source for loads like a refrigerator heater element.
So when properly connected to the tow vehicle 12 volt use is not a problem. The propane system is for when power is limited like when dry camping.
I guess we've covered everything I need to now. Bye. vic