Originally Posted by ilrglen
What is the propane used for?
An absorption fridge is not like your dad's fridge, (unless he had one). It has no moving parts in the refrigeration process. No compressor. It runs at a very high pressure and uses a heater to run an ammonia distillery. The exact workings are a mystery to me, but I understand that partial pressures of ammonia, and hydrogen are key to the cooling process.
The heater is the power behind the cooling process, (ironic). When running on 12VDC, or 120VAC, the are just powering a heater. Many people don't use the 12VDC power supply. It will drain the battery
very quickly. The 120VAC is handy if you have an available source of power. But, propane operation is what is designed for. A fridge will run for weeks on propane. YMMV.