Originally Posted by sailorchic34
Well its not quite 11 watts when it running. I've been using a 3.5 CF 120V fridge with a cheap
modified sine wave inverter for over 5 years now here in the US.
Running it pulls 14-15 amps on 12V (1.3 amps at 110V). What makes it feasible is duty factor. It only runs for about 2.5 minutes every 14 minutes so about 2.5 amps used on average per hour (in the 90+ degree Cali Delta
heat). So figure 60 to 70 amps a day. Which is in the ballpark of 12V systems....
If it is working for you and meeting your needs then there is nothing wrong with your fridge, but only poorly insulated 12 volt systems should be using that much a day.
Our EdgeStar 63 quart....
...portable uses about 30-40 a day in 80-90 degree cabin
Macgregor 26S Inside Mods page 22
.... and the larger...
....4 cu. ft. with small freezer section fridge we made for the Endeavour
Endeavour 37 Interion Mods Index
...about 1/2 of that (15-20 amp/hr a day).
Since the dorm type fridges are meant to be used with available AC they probably don't do much to them to make them super efficient.
came with a 12v/110v fridge that was a front opener, much like a dorm type fridge. It wasn't very well insulated at all. The previous owner day sailed and the boat was plugged into shore power
most of the time so the fridge didn't have to run on 12 volts very much. The fridge worked well for him. We won't be plugged into shore power
when we have the boat in the water
so an efficient fridge was high on our priorities so we took the old one out and replace it with ...
..the new one.
If one doesn't want to make a fridge and feels that most of the portables are too expensive you might look at the EdgeStars. They are a true compressor type and we have been very happy with ours.
One just has to evaluate their needs and the dorm type fridges certainly have the edge when it comes to cost if you can handle the power side of the equation,