Not used the van for a month or so, battery showed 12.8 when we parked up for the evening at 19.30 after a three hour drive. However, it now shows 10! Eberspacher has not come on and I am assuming our battery is too low? Not very good at all this tech stuff but should we have charged it up before we left home? We have a 160watt solar panel but I suppose that would not get much charge at this time of year. Stupidly I assumed that the drive would charge it up. Can someone clarify how we should do this in future....have turned the fridge off, not using any lights ( lucky we had a battery lantern) and taken chill off with gas ring. Can hook it up tomorrow and going home again Sunday.