Ammonia is the solution

[High Performance Lubricants]

Pure ammonia does not present a corrosion problem. Wet ammonia however can be a different story. It is the contaminant that causes the issue

 

[meep]

The new 12v units are compressor-based. Pull around 3-5 amps of 12v dc.

I’ve owned both… 3 ammonia fridges (120v heater and LP with 12V for the electtonics), a 120v/12v compressor based fridge, and an oddball ammonia fridge that could cool on 12V alone, but needed about 20 amps to do it (resistance coils).

they have had “inverter” compressor based units in marine use for a while since LP is a no go inside of a boat hull. It’s heavier than air and likes to sink into the galley and not leave. These compressors / inverters are not sexy technology like we’d think of - the compressor sounded like it was an old wahl trimmer where the alternating current from a simple electromagnet would push/pull the cutting head back 60 times per second - and I got the feeling the compressor was about the same thing. On 12V, it was able to approximate the same buzzing experience (through what was probably a very crude “inverter”), and the stickers all over it warned it to be very sensitive to power concerns. That said, you nailed it - 3.5 amps to cycle and buzz all day long. I greatly preferred it - it cooled quickly and accurately - and mine was 20 years old and worked great. I let it run 24/7 on shore power. I totally wish these came in travel trailers. Gotta pay to play.

 

[ctechbob]

I’ve owned both… 3 ammonia fridges (120v heater and LP with 12V for the electtonics), a 120v/12v compressor based fridge, and an oddball ammonia fridge that could cool on 12V alone, but needed about 20 amps to do it (resistance coils).

they have had “inverter” compressor based units in marine use for a while since LP is a no go inside of a boat hull. It’s heavier than air and likes to sink into the galley and not leave. These compressors / inverters are not sexy technology like we’d think of - the compressor sounded like it was an old wahl trimmer where the alternating current from a simple electromagnet would push/pull the cutting head back 60 times per second - and I got the feeling the compressor was about the same thing. On 12V, it was able to approximate the same buzzing experience (through what was probably a very crude “inverter”), and the stickers all over it warned it to be very sensitive to power concerns. That said, you nailed it - 3.5 amps to cycle and buzz all day long. I greatly preferred it - it cooled quickly and accurately - and mine was 20 years old and worked great. I let it run 24/7 on shore power. I totally wish these came in travel trailers. Gotta pay to play.

The 12v one (Everchill)in our 26DJSE cools every bit as well as the GE in my house running off 120v. Last few times we took it out I actually had to back down the temp some, it was freezing the ice cream we had in there rock solid. And it is quiet to boot. I don't think I've ever noticed it running. Completely glad I got one. We rented a camper with an absorbtion fridge and I stayed in my Aunts 5th wheel with one. The new 12v units are night and day better than those things. I think a cooler with ice in it sitting outside in the summer would keep drinks colder.

 

[Jpc1623]

I saw on tv awhile back that Japan was using coal at a power plant and a by product was ammonia. They used the ammonia to produce more energy, almost getting to no emissions. It was only an experimental plant.