how long does a 12v power pack last

[naughtymutt]

Does anyone know how long one of those 12v power pack (those things with the jumper leads, air compressor etc etc etc) can run for. I have a coleman 12v fridge that I might like to run for the weekend.

[SIMONR]

... probably about 5 hours.

I found this http://www.coleman.com/coleman/images/pdf/5640.pdf on Google and it draws 4A @ 12V.

The biggest Draper power pack (http://www.draper.co.uk/Pages/Pagesource/p67.pdf) has a couple of 12V batteries and is rated at 20Ah.

Simon

[Piglet]

Before you get too involved in this, do you mean a fridge or do you mean an electric cold box? 

The difference is in the amount that it will cool, most cold boxes will only cool to 20 degrees below ambient temperature so are pretty useless once the temperature gets up to 30 degrees+ as it may do at Le Mans.