Look it up for 12V power use. It is generally 3 times as much. Or better yet, park and see how long you can last on a 12V absorption refrigerator using just your batteries. The whole point is an absorption refrigerator is redundant in that it can use 3 power sources but to say you can get by without propane with one is highly questionable with a one or two battery common B setup. Yes, you can drive on 12V but you can't stop for long without propane and you can't dry camp without propane. It is that simple.