This may not be the right area for this question but I suspect that the people who frequent this area are the most likely to have the information I want. I read a lot from people who say they ran their 12 v fridge for x days and they still could start their car with no problems. I understand that many fridges have low voltage cutoffs (e.g 11.5) volts but I'm really curious about the range of actual current draws of 12 volt fridges in the +/- 40 liter range.
According to the charge curves published for the Trojan T-105s I have, a low voltage cutoff of 11.5 volts would have depleted my batteries by 90% before shutting down the fridge and popular opinion seems to be that regularly depleting my batteries below 50% is a bad practice.
From reading reviews and articles, for planning purposes, I have been assuming that at 12v I might expect to use roughly 27 amp-hours in a 24 hour period for this type of fridge in moderate temps. This may be low as I suspect that the few amp readings I have seen reported were probably actually made closer to 13.5 volts than 12.
Has anyone actually made the measurements on your fridge? I know there will be lots of variables but I'm just trying to calculate how many days, on average, my batteries can stay above 50% with the types of loads I might expect if I added a fridge. Getting a range of numbers I could average would thrill me. Mostly what I want to know is if my 27 amp-hour per day estimate is fair.