Power Equipment Forum banner

21 - 40 of 59 Posts

·
Registered
Joined
·
41 Posts
Adding to the waveforms so they are on this main thread.
Here is a Generac Ultrasource 15000. Sampled through a 12V transformer.

This is at 6000watts (3K per phase) load.
8808


There is some frequency drift. If I turn on persistence (digital oscope), you'll see there is some frequency drift.
8810


Here is at 10KW load (5KW per phase):
8809



I don't have a method to measure THD...but Generac did finally admit that its < 20%.




If anyone has the output of a CAT RP12000E or a Westinghouse WGEN12000, please post. I'd love to see what that waveform looks like as I'm thinking about purchasing one of these.


-J
 

·
Registered
Joined
·
285 Posts
my 1800watt UPS has a THD of 5% or lower,,,but I have no idea of the THD on my 2800watt non-inverter generator is, but Im guessing its quite shockingly bad.
 

·
Registered
Joined
·
356 Posts
Adding to the waveforms so they are on this main thread.
Here is a Generac Ultrasource 15000. Sampled through a 12V transformer.

There is some frequency drift. If I turn on persistence (digital oscope), you'll see there is some frequency drift.
View attachment 8810

I don't have a method to measure THD...but Generac did finally admit that its < 20%.




If anyone has the output of a CAT RP12000E or a Westinghouse WGEN12000, please post. I'd love to see what that waveform looks like as I'm thinking about purchasing one of these.


-J
Turn on persistence with your utility power, is there any drift over time?
 

·
Registered
Joined
·
41 Posts
We are doing good. Feel fortunate that we have multiple backups (including wood stove and gas place). Feel bad for folks that are not as prepared.
 

·
Registered
Joined
·
356 Posts
We are doing good. Feel fortunate that we have multiple backups (including wood stove and gas place). Feel bad for folks that are not as prepared.
If it warms up some tomorrow, I'll set up my scope and measure the frequency drift on utility power. It's a digital scope as well.
 

·
Registered
Joined
·
356 Posts
Adding to the waveforms so they are on this main thread.
Here is a Generac Ultrasource 15000. Sampled through a 12V transformer.

This is at 6000watts (3K per phase) load.
View attachment 8808

There is some frequency drift. If I turn on persistence (digital oscope), you'll see there is some frequency drift.
View attachment 8810

Here is at 10KW load (5KW per phase):
View attachment 8809


I don't have a method to measure THD...but Generac did finally admit that its < 20%.




If anyone has the output of a CAT RP12000E or a Westinghouse WGEN12000, please post. I'd love to see what that waveform looks like as I'm thinking about purchasing one of these.


-J
Jeb, Here is my utility power:
Normal
Normal.jpg

Persistence:
Overlay.jpg
 

·
Registered
Joined
·
41 Posts
Here is my utility power by comparison (finally came back on after 6 days :)😃)
8824



Here is the drift of my utility power:
8825
 

·
Registered
Joined
·
356 Posts
Here is my utility power by comparison (finally came back on after 6 days :)😃)
View attachment 8824


Here is the drift of my utility power:
View attachment 8825
What we are seeing here is not drift but voltage fluctuation. Most notable in my examples.
Due to two electric space heaters on the circuit I was recording, the voltage varied from 118V to 124V as the heaters cycled on and off.
Thanks for posting the follow up.
Glad you are back on the grid!(y)
 

·
Registered
Joined
·
356 Posts
I received my new Fluke 345 Power Quality Clamp Meter - Electronic Power Meter today. Let the fun begin.
No more guessing what the THD is, and what effects the output THD of my generators.
I have other uses for it as well. The Science lab is open.
 

·
Registered
Joined
·
2,884 Posts
LOL!
just like christmas over there!
"look out world he has a meter!"
lol!
let me know when you get your first fluke scope meter.
 

·
Registered
Joined
·
2,884 Posts
yup for a small unit it looks like a good one.
we have the larger 4 line version in the lab.
4 clamps and does digital data log.
cool for 3 phase with ground.
you can see all of it at the same time span that way.

yup all that vector stuff is what you need to look at power and phase alignment.
and the better the resolution the better the data...

good job on the good meter choice!
lol
you will have to go back to school just to learn how to fire it up!!
LOL!
did it have blue tooth yet?
i did not check on that...
fluke they are adding blue tooth to some of the new meters now so you can see them in data view or lab view for industrial.
and doing wifi as well.
 

·
Registered
Joined
·
2,884 Posts
oh that brings up a question for you!
what band selectivity does the band scope have??
can you narrow that down??
just thinking digital trash these days from cell towers harmonics..
and they feed digital control signals down the power lines now...
horrible hash!

the meters are only as good as the pickup as well..
 

·
Registered
Joined
·
53 Posts
Bob S pointed out that a Powerhorse generator I have on order has a stated frequency range of frequency ranges from 56.5 to 63.3 hertz per the manual. Powerhorse claims 5% distortion. Does frequency drift have a bearing on distortion? Even if the distortion is actually only is 5%, does having a such a frequency range make it meaningless for use with sensitive electronics as it would still be unsafe?
 

·
Registered
Joined
·
356 Posts
As promised results from my Generac GP15000E with my Fluke 345 Power Quality Clamp Meter.
Will do the Champion Inverter later.
No load:
Generac GP15000E No Load.jpg

Generac GP15000E No Load Hz.jpg

House Load with Heat Pump, TV's and all LED lights turned on.
Generac GP15000E House Load.jpg

Sine wave output with house load.
Generac GP15000E Sine Wave.jpg
 
21 - 40 of 59 Posts
Top