I am not sure but I am running dual batteries (both Optima Yellow Top). I ran the fridge for 2 days straight without any solar and running the engine, the voltage didn't go below 12.4V ... and I set the temp to -6 oC under 39 degrees plus during day time.
This looks a bit different to the Aldi (Sterling) 45lt fridge I have. Purchased 6 months for $500 new & running continuously in the back of vehicle powered by a Optima yellow & 200w panel on the roof it hasn't missed a beat. Draws close to 5A at start up but within a few seconds drops to around 3A. It's also a lot lighter than my 16yo 15lt Engle (still running). I'm very happy with the Aldi fridge.