BOAC the HBB loads are those that are always on. So this becomes a case similar to parking an airplane in storage. How long can the battery endure this without going flat? Hours, days? I don't have the design requirements here, but I think there is some sort of number aattached to that condition.
flyboyike Right. I stand corrected. This is a case of all buses normal except for the battery charger. Only the HBB loads will draw down the battery.