We have a 21ft ATV, which we normally run off 12v, however, when we do run on power (240v)we notice at night that the power supply(which is directly under the head of our bed) hums whenever the vitro fridge starts up which is regularly throughout the night. WE have temporarily solved this by switching over to 12v at night, does anyone have any other suggestions? regards "Dummowin" currently in Barcaldine