I can only tell you anecdotal evidence. Hook up what you want and run it. If your battery goes dead, you're drawing too much.
verslagen1 wrote on 10/15/12 at 09:15:35:Simple answer, 2 sets of 55/60w headlights, but not 3.
But it also depends upon your use.
Hop on the bike start her up, flip all the lights on, drive 15 minutes to work at 25 mph and you'll have a dead battery within a couple of days, even w/a stock headlight setup.
But, wait till you hit 50 and then flip the extra lights on and a half hour commute and you could be ok.
You just have to realize that peak power doesn't occur till after about 3k rpm's and you need some time at low power draw to charge up the battery. And once you come down out of the clouds and prepare to land, these accessaries need to be shut off.
This may be the best way to tell if your equipment draws too much. Hook it up and go fer a ride... a short one.
Gyrobob wrote on 10/14/12 at 19:19:11: -- I put an LED voltmeter on mine temporarily to see what effect it had when I used an electric jacket.
-- With the jacket switched off, the voltage at cruise (maybe 3000 rpm) is around 13.8 to 14 volts.
-- With the jacket on, the voltage is about 13 volts. The battery is just barely being charged.