Perplexing problem with Avan fridge running of battery

Submitted: Monday, Jul 30, 2012 at 19:14
ThreadID: 97163 Views:7496 Replies:3 FollowUps:13
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If I plug a portable AGM battery into the andersen plug on the Avan drawbar I can run the Electrolux 3 way fridge well on 12 volts - it will freeze in hours from ambient. (Fridge also works well on 240volt but not at all on gas but this is probably a different story)

If I loop back the Avan on board battery to the fridge 12 volt curcuit nothing happens with the fridge despite the 12 volt light switch being on. In fact I'd almost swear the fridge heats up. I am monitoring ambient and fridge temperatures with a Waeco fridge thermometer.

I have checked the voltage on the avan battery (and the AGM battery) and the polarity all of the andersen plugs. I believe the avan battery is fully charged and it certainly runs the on board lights well.

I'm half wondering if voltage drop is the issue. The cable from the drawbar to the on board battery (for car running of the fridge on 12 volts while on the move) is quite heavy. The cable from the drawbar to the battery for car charging of the on board battery while on the move is much lighter. When I do the loop back I just plug the 2 andersen plugs at the drawbar into each other.

Any suggestions appreciated

Ian
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