Alternator output question


Information and questions on GL1100 Goldwings (1980-1983)
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goldminerusa
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Alternator output question

Postby goldminerusa » Mon May 21, 2012 8:49 pm



On an 82 1100s, will the electrical system handle 2, 55 watt fog lights connected to the Acc. fuse? And what is the alternator output at idle and at redline?



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virgilmobile
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Re: Alternator output question

Postby virgilmobile » Mon May 21, 2012 10:32 pm

No.It will discharge the battery,and blow the 5 amp fuse.
5 amp X 13.8 volts = 69 watts.
2 @ 55 watt lamps = 110 watts.
They would require a # 12 wire and a 15 amp circuit on a separate switch.
Here's a general idea.
The bike was designed with enough stator capability to operate the bike and charge the battery with little left over.
On a good day,my 1100 draws 10.5 amp at 13.8 volts running at 2000 rpm,and after recharging the battery for 10 minutes at 14 amp ,it tapers off to 4 amp draw.
So with it going good and at 3500 rpm I have a whopping excess of maybe 100 watts left to play with.
You let it lollygag under 1800 rpm and it will barely keep the battery from discharging.

So if you want to add 2@ 55 watt driving lights,your gonna have to get the power from somewhere else.
First thing may be convert everything except the headlight to LED and use 35 watt lamps instead of 55 watters.
The best I've measured from a gl1100 stock stator is right at 24 amp 14.6 volts maxed out 3500 rpm.

goldminerusa
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Re: Alternator output question

Postby goldminerusa » Tue May 22, 2012 7:58 am

Yes. But, the copy of the honda service manual i have indicates a 10A fuse in the ACC location, as does the fuse box label. 10A x 13.8v = 138w, 28 watts remaining, unless we all have different versions of Mr Honda`s manual. What about the engine 15A fuse? Does the engine really need 15A to run the ignition? Yes, i know "maybe 100 watts left over". This begs the question, is there a way to upgrade the ALT. without chopping up my bike for the "poorboy conversion"?

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virgilmobile
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Re: Alternator output question

Postby virgilmobile » Tue May 22, 2012 8:54 am

There are differences.My acc is a 5 amp.It all boils down to available excess power at a given rpm.
The fuse for the bike is rated at 15 amp.The bike will draw 10-12 amp normally,so it's fused at 125%.

Remember,the actual specs say the system can provide 300 watts at 5000 rpm.
You will get lower as the rpm drops and I'm sure you don't run the bike up there continuously anyways.

The stator really doesn't start to put out any excess until it hits 1800 rpm,it's output is directly proportional to the rpm.

There is,I heard,of a aftermarket stator that is made to provide up to 350 watts of power under the same conditions
The drawback is the cost plus pulling the engine to replace it.We usually just live with the fact and compensate to be able to add more lights.

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WingAdmin
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Re: Alternator output question

Postby WingAdmin » Tue May 22, 2012 9:57 am

virgilmobile wrote:First thing may be convert everything except the headlight to LED and use 35 watt lamps instead of 55 watters.


That's exactly what I did on my 1100, and I ran it that way for many years with no problems. I did however put a relay in, hooked to the neutral switch, so that whenever the bike was in neutral, it turned off the 35 watt lights. That way, when the bike was sitting idling (meaning it already wasn't putting out enough power to run everything) it didn't have the additional load of 70 watts of lights.

goldminerusa
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Re: Alternator output question

Postby goldminerusa » Tue May 22, 2012 11:19 am

I see, and thanks to both of you. Wingadmin, do/did you feel that 70 watts of fog light is sufficient to provide a meaningful difference? And will you expand on how you wired the relay?

goldminerusa
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Re: Alternator output question/more

Postby goldminerusa » Tue May 22, 2012 11:30 am

Oh, and i`ve read recently that converting to LED bulbs requires changes other than simply changing bulbs, can either of you expand or correct me/us on that?

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Re: Alternator output question/more

Postby WingAdmin » Tue May 22, 2012 1:02 pm

goldminerusa wrote:Oh, and i`ve read recently that converting to LED bulbs requires changes other than simply changing bulbs, can either of you expand or correct me/us on that?


You will also need to change your flash relay to an electronic flasher. There are no other changes required.




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