We have a 4x4 vehicle install where we have added a second orion xs and a battery bank upgrade.
The first one had some decent history on it, however after the system update we have noted that neither the origional orion or the new one have or show any history graphs for charging.
But there have been several trips with charging and successful cycles on the house battery.
I also have Orion XS in a 4x4 setup. Mine remains powered (via the start battery connection) even though the house battery is isolated when the vehicle is not in use. It loses the Trend screen settings and data after a few days but not the overall statistics on the History screen. I guess memory is limited and it either over-writes the trend data or stops recording it after a few days of inactivity.
However very irritating to have to reselect Trend parameters every time I use the vehicle.