Troy, the maximum output of the stock charging system is 280 watts. The normal load on the charging system, with no accessories, is about 100 - 120 watts, so you do have some power to add accessories, but just remember, that the 280 watts is at higher riding speeds. If you are using an accessory like my driving lights , PIAA 40's (2, 55 watt lights) you will wear the battery down to where it won't be able to operate the starter, after about 45 minutes of 'city driving'. So you have to limit the heavy power use accessories when in other than highway riding. I rigged up my digital multimeter directly to the battery, and velcroed it to the gas cap, to see what kind of voltage I had at the battery, while I was riding at varying speeds and accessory loads. I found that on my '81 R65, that as long as I don't ride under 45 mph, with no stopping, I can keep my driving lights on, anything slower, and the charging system was not making enough electrical power to meet the needs of the load, so the battery starts discharging. Also remember that if you do add accessories, you are now running your charging system at near it's maximum output, and that you most likely have original charging system components ( 20-28 years old), and may cause a premature failure. There are two after market high output charging systems available for our bikes, the Omega 400 watt system, and the Enduralast 450 watt system. They are in the $500-600 cost range.
