I"ve seen several threads here asking about power demands of
portable fridges, I have done a
test with a 50 lt Waeco and an 11 lt Waeco over a few weeks and here are the results for anyone interested.
I have been waiting for my 50 lt fridge to die so I can replace it with a dual zone but it refuses so I bought a CDF11 to use as a freezer, my 80watt solar panels would run the 50 lt Waeco no worries but I was concerned about running a freezer as
well. I now have a 150 watt blanket panel from SCA, very easy to store.
The 50lt Waeco set to +2 dec as a fridge averaged around 0.22 Ah and when set to -10 deg as a freezer averaged around 1.1 Ah.
The CDF11 when set to +2 deg averaged around 0.2 Ah and when set to -10deg as a freezer averaged around 0.85 Ah.
So with my 50 lt fridge at +2 deg and my CDF11 at -10 deg I could expect an average current consumption of around 1.1 Ah.
So overnight , say 16 hrs, when solar panels don't do much both the fridges would consume about 18Ah from my battery, or about 20%.
The following day if my solar panels generate about 5 amps, being conservative, means that this energy would be replaced after about 4 hours of sunlight, in fact with the 150 watt blanket and a Chinese MPPT regulator I see just on 10 amps in good sunlight.
It was interesting that both fridges drew considerably more power for 2 to 3 days before stabilising, so it would be
well worth pulling them down on house power before setting off.
These tests were performed without opening the fridges, frequent opening may increase the power consumption, and in an environment of around 20 deg so in 40 deg heat the power consumption would be higher.
When it warms up a bit I will be off again, with my power monitor, and should be able to provide some real world figures, keep you posted.