[ARC5] AN-Ranges

[DSP3]

Typically, 3600 RPM generators are light duty, emergency, etc.  They 
typically have a maximum 2000 hour lifespan, not that some will last 
less or more.  On the other hand, those that operate at 1800 RPM are 
used for power generation and true "standby" power.  Orders of magnitude 
more reliable over time than the 3600 RPM types. The two CAT 125KW 
diesels we had on Swan Island were 1800 RPM.  Manufacturers like 
Homelite and Generac use 3600 RPM to get the required power at less cost 
for the engine and alternator/generator unit.  Ya get what you pay 
for........

Jeep - K3HVG


On 5/4/2018 2:46 PM, Kenneth G. Gordon wrote:
> On 4 May 2018 at 11:29, bob at vanirmail.com wrote:
>
>> Good morning Ken.
>>   
>> Did you really mean 60 RPM?
> Yes. 60 RPM
>
>>    Or perhaps 60 revs per second, I.E
>> 3,600 RPM?
> Absolutely not. They wouldn't have run more than a week before failing at that speed. I had
> two military 5 kW generators at one time: a PU-286G which turned at 1800 RPM, and a
> different one which turned at 3600 RPM, both had 4 cylinder in-line engines in them. I never
> could figure out how the 3600 RPM job could be very reliable, but it did have
> positive-rotation valves in the engine and ran for a full 24 hours at one Field Day in which
> we used both of them. Talk about a screamer!
>
> 60 RPM.
>
> I was amazed.
>
> A 2-pole alternator requires 3600 RPM for 60 Hz, a 4-pole, 1800 RPM, etc.
>
> I have forgotten the mathematical relationship between poles and Hz output, but according
> to my quick and dirty figuring here, a 60 RPM generator would require something like 120
> poles.
>
> Anyway, I assure you that Woody insisted that they were 60 RPM generators. I questioned
> him closely at the time, and he assured me it was so. And they were Kohler, too. Old ones.
>
> Ken W7EKB
>
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