On AV rider they give the KLE500 alternator at 350 Watts, giving about 70 spare after the carb heaters etc. If you can't run a pair of heated grips at 15W you have an issue.
Lights at 110W are flatening the battery. You are pulling just over 9 amps (110W/12V), so divide that into the Ah rating of the battery and you know how long you've got. I'm guessing it'll be under three hours.
The info above is fault finding only.
What you need to know is:
Voltage x Current = power Volts x Amps = Watts
Find two (you always know you've roughly 12V) and you can calculate the other. The fuse ratings (Amps) tell you the absolute maximum that circuit will ever see.
So, 12 volts through a 15 amp fuse means at most (12x15) 180 W available at the end of that wire.
Andy
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