My folks live in the very rural Appalachian Mountains. Twice this past winter they're power was off for an extended period of time, once for 11 days and another for 9 days. Their back-up plan worked like a charm....they have an upright freezer and a deep chest freezer. In one of them they keep 4 gallon jugs of water frozen. When the power went off, they put the jugs in the refrigerator effectively turning it into an ice box. They hooked their freezers up to their emergency solar system (4 batteries, a 3500 watt inverter and (2) 100 watt solar panels) By rotating the freezers into the charging system they were able to keep them both perfectly frozen and they rotated 4 frozen jugs into the freezer--freezing 4 jugs while 4 others maintained the refrigerator as as ice box. This little solar system also kept the fan running on their fireplace insert, keeping their bums nice and toasty warm! A separate battery and small inverter also powered my brother's CPAP machine without a hitch!
Blessings,
Shenandoah