Picked up this gem a few weeks back
It's sold under loads of brands. Runs mains compressor or 12V peltier, but with no thermostat on the peltier, it consumes more power (48Wh) on 12V than mains, so I'll just use a small inverter in the car.
The compressor ran for 3 mins every 18 mins maintaining 0C (setting 4) with 18C ambient. That's ~8Wh. I'll have to see what it uses to drop to -15C, but will make a useful backup freezer, or overflow freezer in the summer when we have energy excess.
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