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how many alternator amps??

G

GS750

Forum Mentor
Just a quick question whilst I locate my workshop manual, does anyone know how many AMPS the standard GS750B alternator and shindengen rectifier puts out please??
 
GS750 said:
Just a quick question whilst I locate my workshop manual, does anyone know how many AMPS the standard GS750B alternator and shindengen rectifier puts out please??
Click to expand...
Assuming a 200 watt stator output, figure 9 amps for each of three stator wires- this would let the R/R send 15 amps of DC current into harness.
 
tom203 said:
Assuming a 200 watt stator output, figure 9 amps for each of three stator wires- this would let the R/R send 15 amps of DC current into harness.
Click to expand...

I have measured about 14 amps on my bike (GS1100E). It is load dependent as well as much as a function of the stator and R/R (measured at the R/R output).

And please nobody start trying to do 3 phase calculations :o
 
The Factory Service Manual says 14AH. That is where I got the info. I'm just sayin'.
 
koolaid_kid said:
The Factory Service Manual says 14AH. That is where I got the info. I'm just sayin'.
Click to expand...

AH stands for amp hours; that is a measure of battery capacity. It will produce 14 amps for 1 hour (subject to some voltage tolerance)
 
Thanks for the replies everyone, I figured it was around 13-16 amps :)

I am just playing around with some custom wiring looms at the moment and I wanted to make sure I dont under (or over) estimate my needs.

I am installing a dual relay to the high and low headlight beams but I have also converted my instruments and indicators + stop/tail lights to custom made LED board's as well

Just wanted to be certain :)
 
with an operating rectifier regulator I doubt you ever see more than 7 D.C.Amps peak right after electric starting and then it will taper off to 3~5 as the battery resaturates.
 
trippivot said:
with an operating rectifier regulator I doubt you ever see more than 7 D.C.Amps peak right after electric starting and then it will taper off to 3~5 as the battery resaturates.
Click to expand...

You can be a doubting thomas, but I have posted the current clamp measurements and 14 amps at 5K RPM is about right. 11 amps at idle.
 
posplayr said:
You can be a doubting thomas, but I have posted the current clamp measurements and 14 amps at 5K RPM is about right. 11 amps at idle.
Click to expand...
Actually, I am the doubting thomas. 15 amps per stator lead seems very high- Are clamp on meters accurate at 400 cycles frequency? According to Mr. Tesla, P = 1.732 I V ( where I is line current, V is voltage between stator leads, and P is power), so your stator is pushing out about 350 watts if you have 15 amps and 14 volts? double wow!
 
tom203 said:
Actually, I am the doubting thomas. 15 amps per stator lead seems very high- Are clamp on meters accurate at 400 cycles frequency? According to Mr. Tesla, P = 1.732 I V ( where I is line current, V is voltage between stator leads, and P is power), so your stator is pushing out about 350 watts if you have 15 amps and 14 volts? double wow!
Click to expand...

I can see why you have your doubts, this stuff can be very confusing.

You should remember the KISS principle.

14 amps DC at 14.5V is 203 watts. no sqrt(3) required
 
posplayr said:
I can see why you have your doubts, this stuff can be very confusing.

You should remember the KISS principle.

14 amps DC at 14.5V is 203 watts. no sqrt(3) required
Click to expand...
Yeah, but at that DC output, the effective AC current in a 3-phase alternator is 8 amps - this is what one would measure if they stuck an meter on any of the 3 stator outputs. This is why 3 phase is so predominant- the overlap of the phases delivers power effficiently with less bulk.
 
boy O boy

boy O boy

Doubting Thomas? LOL!


LMAO 11 ampres at idle?? I can smell your battery cooking from here


What and how -- exactly --are you measuring this electrical value?
 
Last edited:
tom203 said:
Yeah, but at that DC output, the effective AC current in a 3-phase alternator is 8 amps - this is what one would measure if they stuck an meter on any of the 3 stator outputs. This is why 3 phase is so predominant- the overlap of the phases delivers power effficiently with less bulk.
Click to expand...

tangential tom has now left orbit :eek:

Please provide other informative data on the price of cheese in Denmark.


The original question........................................................

Just a quick question whilst I locate my workshop manual, does anyone know how many AMPS the standard GS750B alternator and shindengen rectifier puts out please??
Click to expand...

The R/R puts out DC which what I was answering.

And thank you very much but I don't need a lesson on 3 phase power. I got that over 30 years ago in my "sparks and magic" course.
 
Last edited:
I don't play much with 3-phase power, but I did not read that requirement into the original question, either.

I was just going to comment on this:
trippivot said:
LMAO 11 ampres at idle?? I can smell your battery cooking from here
Click to expand...
Just because the alternator/regulator combination is putting it out does not mean it's all going to the battery.
noway.gif


Some time ago, I had gotten my clamp-meter out to answer a question on the Sienna forum on which I am a member.
The question there was "is there enough output at idle to charge a trailer battery?" This was my reply:
OK, I have not yet connected my full complement of trailer wiring (only have the lights, so far), but just the other day I had my clamp-on ammeter out, so I put it on the alternator output wire. The van was 'cold', as it had not been run for several hours, but the air temp was in the 90s. It was running at fast idle and I had the A/C on, both fans on LOW. The output of the alternator at that time was 61 amps. I moved the meter over to the battery + wire and saw that only 11 of that was going to the battery.
Click to expand...

Basically, the headlight on the bike is going to draw almost 5 amps. The coils will draw 3 or 4 each, for a total of 6 or 8. That means the bike is needing 11-13 amps just to run. If the alternator is putting out 11, I can guarantee that NOTHING is going to the battery. In fact, some might be coming from the battery to help run the bike. :p

.
 
Steve said:
I don't play much with 3-phase power, but I did not read that requirement into the original question, either.

I was just going to comment on this:

Just because the alternator/regulator combination is putting it out does not mean it's all going to the battery.
noway.gif


Some time ago, I had gotten my clamp-meter out to answer a question on the Sienna forum on which I am a member.
The question there was "is there enough output at idle to charge a trailer battery?" This was my reply:


Basically, the headlight on the bike is going to draw almost 5 amps. The coils will draw 3 or 4 each, for a total of 6 or 8. That means the bike is needing 11-13 amps just to run. If the alternator is putting out 11, I can guarantee that NOTHING is going to the battery. In fact, some might be coming from the battery to help run the bike. :p

.
Click to expand...

11 amps was about what it took for the battery current to go to zero.
 
posplayr said:
tangential tom has now left orbit :eek:

Please provide other informative data on the price of cheese in Denmark.


The original question........................................................



The R/R puts out DC which what I was answering.

And thank you very much but I don't need a lesson on 3 phase power. I got that over 30 years ago in my "sparks and magic" course.
Click to expand...
Orbit? cheese in Denmark? very informative response..

Yes, he did ask how many amps the alternator was putting out AND how many amps the shindengen R/R was pushing. One might assume he was curious about wire sizes leading from stator to R/R and then from R/R to harness. Last time I looked the stator wires are much smaller gauge because they don't individually carry the full current that the R/R delivers into the harness.
 
tom203 said:
One might assume he was curious about wire sizes leading from stator to R/R and then from R/R to harness. ...
Click to expand...
Or, ... one might assume that he was merely wondering whether he had enough reserve to add some extra lights or a monster stereo. :p

I have found that assuming what a poster wants will quickly get you into trouble.
Just answer the question and maybe offer a tip or two, but don't assume to know why the question is being asked.

.
 
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