With the exception of engel, most 12 volt fridges use the Danfoss BD35 Compressor. My 35 litre Waeco has the same compressor as some of the boating and caravan fridges that are 130 litres. From what I can work out, the difference in the power counsumption comes down to the amount of insulation applied. from all accounts it is a very good compressor, just how it is used is what defines how good the fridge is. seriously considering fitting a fridge with a door in the back of may car, A lot cheaper than the car chest frdges and my research has pretty well debunked the thought of loosing cold air all the time.