The data given for solar-powered refrigerators in the PQS sheets is not given consistently enough so that comparisons of various models can be made.
The data needed for a fair comparison most often is energy consumption at 32 deg C without ice making, energy use with ice making and quantity of ice made. It would also be useful to know the number of days of autonomy time for direct-drive refrigerators. Looking at the PQS sheets it is not always clear how to obtain total energy consumption when refrigerator and freezer consumption are given separately. Perhaps it should state whether or not it is a two compressor model and if the refrigerator and freezer consumption should be added together to obtain the total energy consumption. Another confusing point on the PQS sheets is that the solar radiation reference period is often given without energy consumption data or recommended solar array size. Without this information the radiation reference period has little meaning.
There are few places in the world where average daily temperatures are over 32 deg C. It is important to know if afternoon temperatures peak at 43 deg C that the vaccines will be safely stored and remain between 2 deg C and 8 deg C. However, the average ambient temperature will probably be at 32 deg C or below and the stable running consumption at 32 deg C will be used for system sizing.
The latest data I received for a direct drive refrigerator E003/037, for example, gives no energy consumption at any temperatures or any recommendations on a array sizing, it does however give the solar radiation reference period, which alone would be no help judging efficiency or in sizing a system. When the compressor for this model (E003/037) was switched to an AC model so that it could be transformed into an ice lined refrigerator (E003/036) for some reason stable run energy consumption at 43 deg C was given in addition the cool down energy consumption was listed.
If the pertinent data is not consistently published there is no incentive for a manufacture to build a more efficient product and no way for a buyer to make an intelligent purchasing decision. I hope the PQS sheets can be transformed into a more useful document.
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