[ARC5] AN-Ranges

[Robert Downs]

True.  Just before the second or third hurricane we went through here, I bought a 4500 watt Homelite.  It runs at 3600 RPM and can run the refrigerator, freezer, one TV and a few lights.   Before Ike, I bought a 45,000 watt Onan.  It runs my house, both next-door neighbors and the people across the street.  It has a Ford 300 CID engine running on natural gas and runs at 1800 RPM.  And isn’t as noisy as the Homelite.

 

Robert Downs

 

From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of DSP3
Sent: Friday, May 4, 2018 2:58 PM
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] AN-Ranges

 

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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