I used to leave mine running all day while I was at work (12 hours) in the back of a Prado in the middle of summer when I was on a job just out of Whyalla a few years ago, and never had any problems with it - Whyalla gets at least as hot as Brisbane - I'd suggest hotter.
But Utemad makes a good point about running the engine / alternator for long enough to replace the charge in the battery at the end of the day. I had a 50km drive back into town each day, and then 50km back to work in the morning (I left the Engel running in the back overnight too) - so running for long enough to fully re-charge the battery never seemed to be a problem for me. The Prado only had a single battery - an N70Z.
The one thing that I did do though was to not run the Engel from the "accessory" cigarette lighter in the back of the Prado. I ran heavier wiring directly from the battery to the back of the vehicle, with a small Anderson plug at the end - my Engel 12 volt power lead has an Anderson plug also rather than a cigarette lighter plug - the Disco is wired the same way as the Prado was. I've found that the wiring to the "accessory" outlet in the back of most vehicles that have them fitted is under-rated, and really not good enough to be running a fridge efficiently.




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I was happy to pay for the electrons.
D4 2.7litre
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