I would go a different way, I would invest in the battery pack with enough storage to do what you want and then double it.
Then how you fill the battery pack is up to you, purchase power from SECO, use a small solar panel to charge it over a period of months? A bigger panel to change it over weeks, whatever make the most cost sense to you.
If your real concern is the food in the fridge, then I would suggest a chest freezer instead. Keep it cold, and if power goes out and is going to stay out a while, move everything to the freezer and don't open it any more than absolutely required. A new good chest freezer will last 48 hours if it isn't opened. The fridge will last 4 to 6 hours if it isn't opened.
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