That rather depends on your battery capacity, the current that your fridge pulls...thermal or compressor style?
.. and how much charge you get from the towing vehicle. *
I don't generally bother, I pre-cool the fridge on shore power before setting off, and pack it with frozen food and jugs of ice. The usually ensures that it stays cold for 24 hours or so.
* If you park for any length of time, with the fridge still running, unplug the umbilical, to avoid dragging down your vehicle battery.
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IanP, the man from Scotland
Julie, the Lady From Little Rock
Jay Feather 19XUD, pushing a Jeep Grand Cherokee
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