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That calculator is fine as far as it goes, but it is solely based on your estimate of how long you run the appliance each day, the DC fridge being the biggest guess.
If I were to embark on a major DC upgrade (Li, solar, etc) costing thousands of dollars, I would first install a shunt based battery monitor such as those made by Renogy or Victron (about $100) and use it to capture real amp hour usage over a couple of days camping. Then install you DC upgrade and watch how it performs using the battery monitor.
David
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