12V fridge caution

Discussion in 'Motorhome Chat' started by DavidG58, Sep 6, 2013.

  1. DavidG58

    DavidG58 Funster

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    Maybe by sharing my predicament I can stop others doing the same. This happened last year using the Eurotunnel, they insist on gas being turned off, which I had done, but to keep food and beer chilled I switched my fridge manually to 12V, so while moving around would keep fridge temp down. What I never thought about was when on the train I do not remove my key from ignition, maybe our MH was wired up wrongly, but even with ignition set to off, but key still in for radio / MP3, the fridge must have stayed on 12V because when we stopped in France we stayed stopped on train!! Control panel confirmed cab battery at 11.4V.

    Sorry to those behind who had to reverse off!! Many thanks to Euro Tunnel who were brill and jump started us, I expected to be pulled off and left. We do at least have a solar panel so we had a chance of a recharge before dark!!

    David:thumb:
     
  2. Mel

    Mel Funster

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    I would have thought on that Hymer model you have to run the engine to use the fridge on 12 volt.

    Mel
     
  3. DavidG58

    DavidG58 Funster

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    Good spot Mel

    We have changed MH since, but I would have thought the same would have applied to our older Pilote

    David
     
  4. Mel

    Mel Funster

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    Always possible last owner has done some modifications.



    Mel
     
  5. jonandshell

    jonandshell Funster

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    Motorhomes are notorious for 'modifications'!:Laughing:
     
  6. pappajohn

    pappajohn Funster Life Member

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    your fridge will draw around 10 amps per hour on 12v so the short trip under the channel should make little difference to your engine battery.

    no matter how its wired, alternator or battery sensed, the engine has to be running to trigger the split charge and fridge relay's
     
  7. cmcardle75

    cmcardle75 Read Only Funster

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    Test your battery. Running off 12V on the train would have used 20Ah tops, assuming half an hour on the train and 1.5 hours faffing at the terminal and customs. That should have left your engine battery more than three quarters full.
     
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  8. DavidG58

    DavidG58 Funster

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    your fridge will draw around 10 amps per hour on 12v so the short trip under the channel should make little difference to your engine battery.

    no matter how its wired, alternator or battery sensed, the engine has to be running to trigger the split charge and fridge relay's


    Test your battery. Running off 12V on the train would have used 20Ah tops, assuming half an hour on the train and 1.5 hours faffing at the terminal and customs. That should have left your engine battery more than three quarters full.

    Thanks guys, I have now swapped MH anyway, so presume somebody had done something to the wiring, I will forever more leave my fridge in auto, should have done that anyway as it would have seen gas was off and used 12V when available as option.

    I have lived and learnt

    David
     
  9. mitzimad

    mitzimad Funster

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  10. pappajohn

    pappajohn Funster Life Member

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    unless the relay has welded closed. :RollEyes:
     
  11. stevensson10

    stevensson10

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    better to have lived and learned than never to have learned at all. no matter how many years you've been motorhoming we learn something new every day steve
     
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  12. Reallyretired

    Reallyretired Funster

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    If you leave the fridge in auto with the gas turned off it will just keep trying to light. It will not switch to 12v just because the gas is off, the engine must be running.
    When I go on the tunnel I always switch the fridge to 12v, not to auto, as then it will not attempt to light as the ignitor going constantly for half an hour cannot do it any good. The fridge will not be cooling while the engine is off, but then it wouldn't whatever it was switched to.
     
  13. DavidG58

    DavidG58 Funster

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    I will now never know as the van has been sold, but can only presume the fridge had been wired so it ran off 12V as soon as the key was in. I definitely had a very flat battery when the train stopped, having started and driven on half an hour before.

    Hopefully never to be repeated, a very embarrassing few minutes
     
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