Originally Posted by KyDan
I had a previous trailer with a 3 way power fridge.
I found that it actually partially drained my trailer battery while on the
road. It really is a HUGE amp draw on 12v dc power.
many of us run with the LP on.
Like Goody59 said, it's not safe to run LP on the road. Manual may not say it, but it did say so in older fridges and I doubt things have changed drastically since then.
And - yes, big new LP fridge does consume 12V when running on LP, and a lot of it. About 12 AH daily. This is MORE than top-loading non-LP fridge like Engel or Sundanzer draws when running on DC. Most Engel models run on both AC and DC, Sundanzer is 12V DC only, and they make sense for both cooling on the run and boondocking, even if you don't have solar panels. Engel is specifically made to work in moving vehicles, good protection against vibration. There are 2 problems, though.
1) These models are small: the biggest AC/DC Engel MT80 is mere 2.5 cu.ft, and Sundanzer DCR50 is smaller yet - 1.8 cu.ft.
2) Even small 23" Sundanzer can be a problem to get through some trailer doors. Engel is narrower, though.
There are good 5.8 cu.ft models from Sundanzer and better yet models from Steca, but with 26" or 27" width it would be impossible to get in most trailers without removing large window (and even then it might not be possible in some trailers). Taking dead LPG fridge out can be same difficult, btw.
Sorry for this rant, - just keep in mind that modern LP fridges consume both LP and 12V power. Older LP fridges have no electronics and therefore don't consume 12V in LP mode.
PS: my typo, sorry. Engel MT80 is 2.7 cu.ft. MT60 is 2 cu.ft. Last 2 numbers in model name are quarts (liters).