Disco_owner,
I think you mean your 40L engel draws no more that 2.5A. I don't think A/h (amps per hour) is a common unit of measurement.
Walker, my engel is rated at about 2.75A at 12V. When it cycles on it draws 2.75A, When it cycles off it draws bugger all. A current draw of 5.8A sounds a bit high but it might be right for a fridge that old. Check out it's specifications on the Engel website. As the battery is at 11.9V, First thing would be to give the battery a good charge, wait for the battery voltage to settle, then measure the voltage again. I'd suggest the battery is probably almost dead or not charging. I'd replace the battery with one which has a higher Ah (amp hour) rating.
Engel Australia - Portable Fridge-Freezers
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