PTO Generator Question

[Sawyer Rob]

My Winco 3600 RPM, pto generator is rated "continuous duty"... Maintenance ?, change the rotor bearings every 80,000 hours!

My tractor runs at about 1900 when running it...

SR

 

[Industrial Toys]

Funny, that Whisperwatt sold for $800.00 and they couldn't turn it over. I asked the second from highest bidder if he knew that the thing ran at 3600rpm. He didn't have a clue what I was talking about.

 

[buickanddeere]

$$$$$$$$$$$$$

A 3600rpm pto generator is a screamer.

 

[Industrial Toys]

There it doesn't matter, does it? My Onan PTO set was a fast running rotor, probably 3600. Chain drive probably. Probably a factor as to why I couldn't run it with a 2:1 gearbox on my JD 770.

 

[zzvyb6]

Just to add some color to the otherwise dry discussion. Here's the plate from my WinPower PTO Alternator and some other Big Science farm owner technology.

 

[grsthegreat]

No, my 6,000 rpm jet sky is a screamer

 

[RickB]

Just to add some color to the otherwise dry discussion. Here's the plate from my WinPower PTO Alternator and some other Big Science farm owner technology.View attachment 621270View attachment 621271View attachment 621272

The one I left in NY was single phase the same size and Dad bought it in the early 1970’s.

 

[Industrial Toys]

Not really on topic, but any one have an idea how much an unloaded transformer should draw? Let's say the 110/220 side of a 15 KVA transformer. Nothing on the other 600 volt side, as it's used as an auto transformer.

 

[CobyRupert]

"Standby" generator,
"Continuous" (duty) generator,
"Prime" generator,
"Emergency" or "Emergency standby" generator

These terms all have different meaning, but the terms are all (mistakenly) used interchangeably.

In the case of emergency generators, the difference is in how fast it starts.
In the case of the others, it how long, and how often, they are expected to run, and whether they are rated to handle an overloaded. (Example: A Prime may be rated to handle a 10% overload for 1 hour every 12 hours.)

You can think of a "Continuous" or "Prime" as being de-rated (for a longer life with more continuous (24/7/365) use at continuous load), or conversely, that a "Standby" generator has its rating "boosted" (and lifespan shortened) knowing that it won't be used very often, and has a variable load.

The same exact unit that is rated a 20KW Standby generator may be rated as a 18kW Prime or Continuous Unit. Unless limited by the size of a breaker, both can put out the same power which may be a lot more than 20kW. (Starting large loads is another issue.)

At the end of the day, these are just numbers, the lifespan will be determined by heat and/or the duration of that heat.
Same with the utility transformer on the pole. It may be stamped 30KVA, and is expected to have a 30 year lifespan running at 30KVA (depending on ambient temperatures). But you can pump more KVA through it. It can run 45KVA with no problem, but it may only have a lifespan of 15 years. 60kva may equal 1 years. 150kva may equal 5 minutes, etc....

 

[Industrial Toys]

They punched a couple of holes in my pole top transformer to take a sample. Two, because they lost the first sample! But they never sealed the holes. So now I expect water will get in there and rust out the bottom of the transformer.

It's something I was thinking about working on my latest generator this last weekend. A generator must be up to temperature at load in half an hour or so. It's not going to get any hotter. So why do some manufacturers say you need to observe some kind of duty cycle? In other words, NOT CONTINUOUS. What's the dif?