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Carbon-friendly refrigeration

Updated: Nov 15, 2021

Our off-grid house came with an efficient 24-VDC chest freezer in the garage, which runs off our backup PV system. That's where we keep things that really shouldn't thaw, like the 1/4 grass-fed cow from our neighbor's pasture.

During our first winter, when we had inadequate PV generation and energy storage, we turned off our refrigerator and stored food in a metal cabinet in our garage, which was at about the same temperature as a refrigerator (34-40 degrees F). We found that food actually kept better in the cabinet in the garage, perhaps because of the air circulation, or lower humidity. But that's maybe a little hard-core, even for us. It is so convenient to store your food in the kitchen! So of course, we needed a regular 120 VAC refrigerator. But we wanted one that was efficient and climate-friendly.

One of the top climate actions recommended by Project Drawdown is to switch to non-HFC zero global warming potential hydrocarbon refrigerants (i.e. R600a) for refrigeration. This is not easy to do in the US: since R600a is just being introduced here, most refrigerators sold here still use R134a, a potent greenhouse gas. Refrigerator salesmen have no idea which refrigerant their refrigerators use, and many spec sheets don't even say which refrigerant a model uses. It's hard to find this information online, but you can always find it out if you read the fine print on the label inside the door or on the back of the refrigerator. Our search was made more difficult by the fact that new refrigerators were back-ordered for months (this was during the COVID-19 pandemic), and not all models were available.

So we were thrilled to find an efficient R600a refrigerator in stock at a local store! If you're interested, the graphic above is the specs for the model we found: it's super simple and uses about 2/3 the energy of the larger fancy fridges (which was also important for us, since we are off-grid). And it was cheap, too. It's made in Mexico by Winia (Daewoo's appliance brand). We've had zero issues with it, it only uses 1 kWh/day, it's relatively quiet and it works quite well.

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