AFAIK, and I do have an Engel fridge that will freeze, only 18 litre, all the "12v" fridges have an inverter in them. If, like I do, you also have an inverter for the laptop and charging batteries etc, your poor split charged leisure battery is going to work really hard, to be honest mine is normally flat after the first day and I can only use either the inverter or the fridge when the engine is running.
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