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Not sure what brand you have but the DC current draw for a Dometic refrigerator running on propane is 'less than 500ma' (per the Dometic spec.) so you should be able to run it for 4 days on a typical 100Ah battery and still be at 50% charge (as long as the battery is in good shape and fully charged to begin with, and you remove all other parasitic loads as described above.)
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