According to Total Motorcycle Cross Country review
the charging system puts out 48 amps which is around 576-624 watts. Pretty respectable for a motorcycle charging system. The same site states the Harley Ultra Classic
puts out just slightly more at 50 amps (585W @ 13V, 2000 RPM, 650W max power @13V)
My guess (and yes it is a guess) is that you don't have anything to worry about. However, you could get a battery meter so you can monitor your charging system.
If the battery meter shows 12 volts then you are about at the max draw on your system. If it shows more then you have additional power available. If it shows less then you are starting to draw more power than you charging system can handle and the battery is being drained.