A solar powered medical refrigerator for vaccine storage and transport uses a 12V battery as the power source. Battery capacity is given in terms of A-hr, e. g., a 20 A-hr, 12 V battery can supply 20 A of current for 1 hour at 12 volts. Once the fridge is cooled down, it requires 420 W-hrs (i. e., requires 420 W of power for 1 hr) of energy to maintain its temperature over a 24 hour period. What is the minimum battery size that would be needed to power the refrigerator for two days if there is no sun
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