Alpicool Portable Fridge/Freezer Test (will it freeze water?)

How long does it take for an Alpicool portable fridge/freezer take to freeze water? I tested a small (20 Liter) and a larger (45 Liter) Alpicool portable fridge/freezer. Both were set to -4F, their coldest setting and allowed to chill down the interior for several days before the test. Both were below freezing as evidenced by the ice cubes stored inside overnight remaining frozen.

The test begins with bottles of room temperature water being placed in the already cold freezers. I check on them after 12 hours, 24 hours, 34 hours and 48 hours. The larger Alpicool actually froze the water in 24 hours, although the smaller one took 48 hours to freeze most of its water.

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