Very few things in this universe are infinite and the NT700V alternator output isn't one of them...
According to my European NT700VA specifications, the alternator output is 452 watts @ 5,000 rpm. The US version is stated as being 438W which seems a little strange. If you're running at less than 5,000 rpm you're getting less output from the alternator.
So let's look at what is always using power (European Version):
Headlight, Tail light, Position Light, Licence Plate Light, Instruments, Fuel pump, Fuel Injection system, Ignition, (battery charging).
Now to the fuses:
The PGM-FI Fuse is 20A
The Headlight Fuse is 20A
The "Lights" fuse is 10A
The Brake Light Fuse is 10A
The Fan Motor Fuse is 20A
If you have ABS the ABS fuses total 70A (1x10, 2x30)
Usually the fuse rating is approximately double the normal draw. Your fan and brake lights aren't on all the time so, lets say a nominal draw of 25A or about 335W or about 103W @ 5,000 rpm available on the US version (less if you have the ABS version). Touch the brakes and you lose 42W and the same for indicators so, brake and indicate at the same time and you lose 42-84W. The power just isn't available.
The Accessory Fuse is 10A so ideally you shouldn't put more than 65W through the accessory system. If you want to power more than that, you're going to be borrowing power from the battery a lot of the time. Unless, of course, you're doing at least a steady 85mph, on the highway, in daylight. Then you might have 100-115W available depending on the model (European or US, ABS or non ABS).
Basically just put a 90W jacket on high with no other accessories and you're marginal at best at 85 mph!
In the city you're draining your battery.
These are estimated figures and assume that you're at 5,000 rpm.