does anyone know 90 'GS500 alternator capacity in watts
Manoj

Around 200.

I calculated roughly the consumption of  all the bulbs(headlight,brake light,indicators) to be around 100 watt.Do I need to consider the ignition system  and other electrical 's too when consider overall power consumption,because the heated gear which am planning to  use has power consumption of 100 watt  and would it drain the battery as the result.....
Manoj

I heard somewhere that it is 280 watts, but I could be way off.
Yes you do have to count the ignition systems useage. Figure that to be ~25-50 watts minimum.
Cool.
Buddha.

doesn't it very with rpm.  Like 20watts at idle and 280 by 7000rpm?  that is just the way they usually work on cars.

It will definitely vary with rpms, you need to find out the wattage produced at your normal riding rpm. Sorry, I don't know how to do that!
If there is only a small overall loss of charge during your day's riding, you could top the battery up with a charger at the end of the day.

Ohms law people  

A draw of more than about 240W, (assuming the generator can deliver this much and I dont think it can due to its physical size) will mean the 12v side is seeing 20A.....Hit that, the fuse takes a dump and its game over  .

But.......a 200W draw means about 16.5A in the system, about 75-80% capacity......and thats a nice and cosy place to be  

Someone needs to put a DC clipon or an ammeter on the +line and see how much current is being pulled with everything turned on. From this figure it will be possible to work out exactly how much power the bike needs when running and how much, if any is in reserve before it sees 20A and the fuse pops.

I will do it at the weekend and report back.

Quote from: manoj on October 06, 2009, 12:06:00 PM
because the heated gear which am planning to  use has power consumption of 100 watt 

Just seen this......suggest you get an extra pair of socks because there is no way the GS can handle an extra 100w, thats another 2 main-beams  . 20-30w maybe but not 100.

Quote from: sledge on October 06, 2009, 02:50:39 PM

Quote from: manoj on October 06, 2009, 12:06:00 PM
because the heated gear which am planning to  use has power consumption of 100 watt 

Just seen this......suggest you get an extra pair of socks because there is no way the GS can handle an extra 100w, thats another 2 main-beams  . 20-30w maybe but not 100.

carry an extra 2.3 batteries in saddlebags, and plug em in at every stop. you'll do fine.

Sledge is talking sense again.
The only way you could go close to pulling an extra 100 Watts is if you don't use the headlight. Here in Australia we can't legally turn them off, but if you can that might work. If you get cold feet, buy an opposed twin BMW! The hot air off the cylinders on my old R60 used to take the chill off my toes!

Given the poor efficiency of an internal combustion engine, I estimate there's about 40 Kilowatts of heat being lost by the engine. A lot goes out the exhaust, but there must be a few thousand watts coming off the heads and cylinders. I'm thinking a couple of computer cooling fans and some ducting..........................

I dont think its 20 watt on the 12V all the time.
Because it makes 14-15 even just off idle and that is after its got the ignition amperage separated ...
If you want to stay with that 16 amp number its fine, but you have to count 15V not 12 cos that is what you have on the charging side.
Cool.
Srinath.

I was just checking out the Gerbing site, and they list pants+ vest at about 100 watts. That is for full power though, and from what I've heard from several people who have used electrics for years, you rarely need to use full power. Gerbing also talks about hydrid power, where they have 12v battery packs to provide some of the power. I think that the bike will provide enough juice to power electric clothing while moving, but at idle you would be discharging the battery. a combination of a hookup to the bike plus a battery pack would probably do the job. They also have clothing that is made to run strictly off battery packs, which may be an even more practical way to go.

http://www.gerbing.com/