Sundanzer_System_Sizing

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The "Design Ambient Temperature (F)" is the maximum average weekly temperature that the cabinet is expected to operate in.  If during a warm week the daily high is 100F and the daily low is 80F, then the "Design Ambient Temperature" is 90F.

Example:  Look at the left side of the chart above.  The DCR165 - 5.8 cu. ft. refrigerator at 84F will need 198 watt hours/day to operate.  Now go over to the right side of the chart and look under "Watt-Hours/day Energy Use" for the closest number to  198 which is 200.  Now move under the number of sun hours per day.  Suppose your state has 5 sun hour/day, you will need at least 76 watts of PV (rated) and a 130 Amp hour battery (12v).