12v Battery critically low (msg)

[kanelynne]

Hi, my wife and I have been away for our first weekend in our new Marco Polo, and after arriving at our chosen forest campsite (no mains power) and setting up, all was well until approx 24hrs in when we received a msg saying that the 12v main vehicle battery was critically low. We started and ran the engine for a while and the error stopped but came back in about an hour. This time we left it and eventually the electric side door stopped working. We had enabled the ‘Camper Switch’ on our MBAC App so I struggle to see what would be drawing so much power from the vehicle battery when parked ‍

The leisure battery reported 90% charged when the vehicle battery reported low voltage.

There must be something that we are doing wrong at this point, otherwise the leisure battery is almost redundant.

Has anyone experienced the same and is what was your solution?

Thanks
Kane

 

[Tony Bartlett]

Does it make any difference if you leave the key in the ignition? Does this mean that you're using the main battery until the key is removed?