I just installed a Victron system similar to the VW van install and am on the road trying it out. My system has two160 AH batteries and resides in a trailer. The problem is that when charging from the truck, as soon as the truck is turned off the smart BMV shows the charge to be 10p0% the costumed Ah goes to zero and the system keeps on charging. Consequently, I don’t know the true charge level of the charge when I start charging or discharging. Is this a software issue or something else?