If you're looking for a unit that only uses 300 kwh per year, expect to pay big bucks for a smallish unit. AC_Hacker did a freezerator hack on a small deep freeze, and his usage was around 400 watt-hours per day.
There are only a few retail units that boast the same performance. A euro-market bosch kge39ai40 uses around 390 wh per day and costs around $2000. Most USA-market units use upwards of 750.
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