Re: [ST] Bring on the cold!!!...this enough?

["Enrico" <enrico@xxxxxx>]

Three phase alternators have no linear characteristic curve for the produced output power - so it isn't correct to calculate the output power via the rotations as a linear function.
The full output power will be delivered usually by 1/3 of the maximum rpms of the alternator.

During 'normal' driving conditions always enough current will be delivered for all load (ignition, lights etc.). If your vest needs not more than 50 Watts (3.6 Amps) it should be ok with your 400 W Alternator.

Enrico
'00 ST 'BlueBelle'
Vienna, Austria, Europe
- -- 
my native language is german. if you will find errors you are allowed to keep it for yourself

- ----- Original Message ----- 
From: "Bryce" <bster13@xxxxxxxxx>
To: <ST@xxxxxxxxxxxxxx>
Sent: Tuesday, October 15, 2002 10:23 PM
Subject: Re: [ST] Bring on the cold!!!...this enough?


> 28.6A @ 6000 rpm, 14V. 
> 
> my zx-11 pumps out 28.6A @ 6000 rpm, 14V. So peak
> watts = 400.4 watts.  
> 
> Now that's while the battery is getting a charge from
> the alternator of 
> 
> course (14v) and at peak charge 6,000 RPM.  So just
> estimating here...  
> 
> 28.6v/6000RPM = x/4000RPM, x=19.04v @ 4,000 RPM
> 
> and
> 
> 28.6v/6000RPM = x/3000RPM, x=14.3v @ 3,000 RPM
> 
> so...
> 
> Watts = Amps x Volts
> 
> Watts @ 4,000RPM = 266.84 Watts
> 
> or...
> 
> Watts @ 3,000RPM = 200.2 Watts
> 
> - 60 watt headlight (on high)
> - 42 watts tailights (21 each)
> - 24 watts heated grip kit on high
> - 50 watts homemade heated vest (buid to meet heat
> needs, may draw less)
> 
> = 24.2 Watts left over. with 200.2 Watt system @ 3,000
> RPM or 90.84 left using 266.84 Watts to start with @
> 4,000RPM.
> 
> Can someone check my math here and make sure I took
> everything into consideration?  Is 24.2 watts left to
> charge the battery correct?  Or should I be doing this
> all based off the Ameperage?
> 
> (W = A x V)
> (24.2 = A x 14v)
> (A = 1.73 amps to charge battery?)
> 
> Thanks,
> 
> Bryce
> 
> --- Brian D <brd@xxxxxxx> wrote:
> > On Tue, Oct 15, 2002 at 01:51:14PM -0500, Tom
> > Emberson wrote:
> > > On Tue, 15 Oct 2002, Bryce wrote:
> > > 
> > > > yeah they are cool, but the costs, plus the
> > drain on
> > > > my battery start to add up.  Perhaps heated
> > grips and
> > > 
> > > The ST has more than enough juice comming out of
> > the alternator
> > > for the grips, vest and autocom (not that the
> > autocom consumes
> > > much).
> > 
> > Agreed.  It's a high-output alt with the intention
> > being that you will
> > use a lot of accessories off it.
> > 
> > I've run the heated grips and 2 vests simultaneously
> > with no problems.
> > 
> > Laters,
> > Brian
> > -- 
> > '99 ST (black)
> > Dallas, TX
> 
> 
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