happy wanderer
Day Dreaming ...
Here's what I've got from a collection of different R1150s.
R1150RT: 32F 13.76V average
R1150RT: 75F 13.83V av.
R1150GS: 68F 13.72V av.
R1150RT: 60F 13.62V av.
R1150GS: 68F 13.88V av.
My bike:
R1100RT: 21C 13.95V average
It oscillates between 13.9 and 14.0 constantly. I monitor it using a calibrated quartz crystal digital display meter connected directly to the battery and mounted on my fairing. I have an Odyssey PC680 installed which I connect to an approved Odyssey charger when I get back from short or long rides and periodically over winter when the bike is not ridden much if at all.