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That doesn't depend only on the volume. It also depends on the quality of the insulation, and on the shape. If the insulation is very good, you can keep the refrigerator cool with minimum effort. And if the shape is such that the surface area is small, less heat will leak back into the refrigerator. The amount of energy also depends on the temperature difference between the temperature desired for the refrigerator and the ambient temperature.

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Q: How much electrical energy is required to cool 580 liters refrigerator capacity?
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