I just did a flight, parked and shutdown on the ramp. I tried to turn on External power to work on the aircraft mappings so I wouldn't drain the battery. I toggle it on and. after a couple of seconds, it turns back off.
@Randolf Thanks Rando. I hope that's something that can be changed someday. You can't really know where to park in order to make groundpower available. I suppose I could tow it around until I found a spot but that's not super realistic.