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First thing you need to know is how much YOUR fridge draws for current in amps. Average unit draws between 4-6 amps. Then you need to know the amp hour capacity of your house battery. (You want to have a starting battery separate from the house!) Then divide that amount in half. If you have a 4D battery with 150AH capacity...you have 75 Amp hours to work with. If your fridge in this case drew 5 amps...you would be able to run it for 15 hours absent any other electrical needs. Note that fridges don't run full time and most boaters DO run other stuff so a more practical solution is to wire in a LINK10 which monitors your usage over time and adjust.
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