Sizing your evaporator correctly

For a Fridge – select the evaporator whose maximum fridge capacity is closest to the volume of the insulated box you are refrigerating.  If the plate is too big it will not stay cold enough and will cause condensation making your fridge very wet.
For a Freezer – always select the largest plate possible, you cannot over size a freezer plate.  A true freezer is rated at -18°C or below. (4 star rating).  For a 5 star fast freeze freezer you need to achieve -26°C and below to pull things down to frozen without risk of a temperature rise which could affect existing food in the freezer.
For a combination system the same rules apply as a freezer, specify the biggest plate possible.