Fridges and freezers are pretty power efficient, on the whole, because they're big insulated boxes and the power that leaks through isn't very much. An average of 50W power consumption is not ludicrous for a fairly large, properly functioning fridge (the peak will be larger, since they cycle on and off). It will depend on ambient temperature, of course, but even a pretty beefy fridge running at 100% (which will probably fail in short order since the mechanics are not generally designed for such) is not going to be drawing the 1.6kW you are suggesting.