[Public-List] Alternators...

[Gordon Laco]

Thanks Jonathan, it’s that curve I’m looking for.

Cheers 

Gordon Laco
www.gordonlaco.com
#426 Surprise



> On Jul 16, 2018, at 6:06 PM, Jonathan Bresler via Public-List <public-list at lists.alberg30.org> wrote:
> 
> Would suggest purchasing a DC clamp ammeter.
> The ammeter measures the current flow through a conductor.
> Bought one for Constance.  Quite useful to have.
> Allows you to know how much current the alternator is producing.
> Please note: if the batteries are fairly well charged, the alternator
> will produce less current.   Good to run all your electrical loads for
> a while, then start the engine and measure the current during the
> first minutes.
> 
> Allows you to create the curve that show what your engine
> alternator is producing.  Useful to compare over time to see if
> the values change.
> 
> Don't need a fancy (expensive) one.  Don't need precise readings,
> rather readings to within an amp or several.   Would recommend
> the Craftsman that I bought, but its been discontinued.
> 
> Jonathan
> 
> On Mon, Jul 16, 2018 at 5:21 PM, Anders Bro via Public-List <
> public-list at lists.alberg30.org> wrote:
> 
>> Yes, so multiply that rpm by the pulley ratio to come up with alternator
>> rpm, and make your own plot of output vs engine rpm?
>> 
>> On Mon, Jul 16, 2018, 4:57 PM Gordon Laco via Public-List <
>> public-list at lists.alberg30.org> wrote:
>> 
>>> True, but it’s the engine that has the RPM instrument…
>>> 
>>> Gordon Laco
>>> www.gordonlaco.com
>>> #426 Surprise
>>> 
>>> 
>>> 
>>>> On Jul 16, 2018, at 4:53 PM, Anders Bro via Public-List <
>>> public-list at lists.alberg30.org> wrote:
>>>> 
>>>> Ya, but isn't that alternator rpm and not engine speed? Usually the
>>> pulleys
>>>> are sized to have alternator rpm higher than engine rpm.
>>>> Anders
>>>> 
>>>> On Jul 16, 2018 4:39 PM, "Gordon Laco via Public-List" <
>>>> public-list at lists.alberg30.org> wrote:
>>>> 
>>>> Hello friends…
>>>> 
>>>> Do any of you have data on what the output curve of our Atomic IV’s
>>>> alternators will put out at various RPM’s?
>>>> 
>>>> I’m looking at Moyer’s modern alternators, and noticed that they give
>>>> output figures for ‘normal operating speed of 2000rpm’.  Well even with
>>> the
>>>> boosted rpm our Campbell prop allows, we still don’t get more than 1500
>>>> going flat out… we cruise quietly at 1200.
>>>> 
>>>> I understand our factory supplied alternators are ’30 amp’ but what is
>> it
>>>> really delivering at real operational rpms?
>>>> 
>>>> I understand that at lower rpm’s the alternator isn’t ‘excited’ so
>>> delivers
>>>> little amperage…But I don’t know what the critical rpm rate is to
>> achieve
>>>> excitement
>>>> 
>>>> I don’t understand this whole subject as well as I’d like to.
>>>> 
>>>> Gordon Laco
>>>> #426 Surprise
>>>> 
>>>> 
>>>> 
>>>> 
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> 
> 
> 
> -- 
> Jonathan M Bresler
> S/V Constance Alberg 30 #262
> Annapolis/Eastport MD
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