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Old 10-11-2009, 12:23 PM   #1
RobStar OP
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F800GS Alternator / Wattage Limits

I recently added direct to battery second and third Powerlet outlets on my F800GS in anticipation of getting heated gear.

The alternator rating on my F800GS is 400 watts according to the dealership. I've been trying to sort out exactly how much "headroom" I have left on the bike for heated gear.

The challenge is there's no spec that I can find on how much of the 400w capacity I can use or maybe better yet what the bike is consuming without any of my farkles.

Here's what I "think" I have going:

PIAA hi and low beams H7 bulbs: 55w x 2 = 110
PIAA 510 ATP: 35w x 2 = 70
Zumo 550: ? but can't be much?
LED turns signals: ?
Hyper Lite brake LEDs: ?
Heated Grips: ?
ABS: ?

What I don't know is how much wattage the bike itself takes to run, plus the stock tail light / brake light which are LED. Instinct says the LEDs don't take a lot but I could be wrong. My guess is the Heated Grips are wattage suckers

I know there's amps and volts and Ohm's Law in the mix but as far as I know there's no amperage ratings for the alternator.

Questions, comments and suggestions would be great. Seems like a adding a 90w jacket and 25w gloves gets me very very close to the limit assuming I'm running all the lights (I normally run full lights and high beam for visibility in traffic)

Thanks!

RobStar
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Old 10-11-2009, 12:32 PM   #2
Firefight911
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Go to the top of the Beasts forum and open the sticky link for everything F800GS. All your answers are there.
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Old 10-11-2009, 10:23 PM   #3
RobStar OP
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Thanks!
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Old 10-12-2009, 07:11 AM   #4
JRWooden
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Yeah, what 1bmwfan said

But the short answer is that you only have in the area of 100W or so to play with, and ... remember the alternator does not deliver 400W at idle/low engine RPM so if you are going to "load up" on accy. items a voltmeter of some type is a good idea so you can keep an eye on your charging system status.

Also, as I have not seen it mentioned before, the Powerlet folks have a nice little calculator on their website for this - they call it EEC - "Excess Electrical Capacity".

http://www.powerletproducts.com/lear...rical-capacity
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