2 Important DC freezer vs. AC Comparison Considerations

1. Understand how the air flows when the device is turned on. What's wrong? What is the most effective?

For DC chest refrigerators/freezers, when the lid is opened, it creates a vacuum suction that pushes the hottest air out of the unit (see layering blog description). The way chest appliances work is that the hottest air is at the top, so there is less energy loss from standard opening and closing than an upright AC refrigerator/freezer. When the door of an upright AC refrigerator/freezer (especially a side-by-side refrigerator) is opened, all the cold air comes out and is replaced by potentially warm air, depending on the ambient temperature of the room. For AC units, the compressor fan and the circulation fan start immediately and require energy. For individuals looking to increase energy efficiency, DC appliances are the obvious choice.

2. The total upfront system cost must be assessed

The upfront cost of a quality DC cooling unit may be higher than an equivalent AC unit, but consumers should consider purchasing less to keep the entire system up and running. Due to the efficiency of good DC appliances, less solar energy and less battery capacity are required. So the upfront total system cost is actually cheaper (see example DC vs AC system total cost price comparison).

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