Anyone know how many watts are consumed by the bike under normal operating conditions? The service manual lists the alternator output at 280 watts at 5000 rpm, and the headlight uses 55/60, instruments and other lights maybe 10. What about the ECU and ignition system? I'd like to get some heated gear but am unsure whether the charging system can handle it.

 

I have used a heated vest for a couple years with no problems.

 

+1

 

280 watts = 23.33 amps output (based on 12V but only 21.5 amps @ true operating 13V)

I've run a current load test and the OE system demands (uses) over 13 amps and higher amperage at higher revs. That means out of the say average 22.4 amps available only a bit over 9.4 amps are left to run non-OE "accessories". A lower draw heated vest like the Tourmaster Synergy with collar draws 4.5 amps and heated grips anywhere between 1.8 and 3 amps. An auxiliary LED tail light, radar detector, GPS, and other low amperage devices combined will add maybe another 1~2 amps load. Twin 55 watt halogen driving lights draw 9.13 amps (8.46 @ 13V). Too thin gauge wiring will increase demands. However, replacing or modifying the tail/stop light, turn signals & running lights to LED illumination will offset some of the added load accessories draw.

Personally, I run all of the above accessories (albeit the twin 55 watt driving lights only for short durations but do have a 55/70 watt H4 headlight bulb on a modulator offset slightly by converting the OE tail/brake light to 10 LEDs) and have not (knock on plastic) had any issues on my original 03/97 VR-R and and am on only my second battery. Now I do have a heat sink/CPU fan on my VR-R along with cool air supply & exhaust ducting to it. However, I am in the process of installing a Mosfet VR-R in order to provide higher & more stable electrification. I also run a volt meter to monitor the system.

 

A heated jacket liner can draw 8-9 amps. I already have turn signals without running lights a MOSFET r/r. I might look into a HID projector I hear they draw less power than halogens after initial startup