Just bought one of these seems OK the only problem appears to be there no warning lights on the fridge to show it is working on 240 volts or 12 volts there is a guage to show it wirks on gas.Anyone else come across this seems strange not to be able to check it is operating on 12 volt when attached to car.The other thing is the manual states that it should not be left on 12 volt operation when car not connected as this will flatten van battery not come across this before.