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Generators & Electric Motors General Discussion Antique Generators and Old Electric Motors: Questions and answers about restoring and showing old power generation systems.

Generators & Electric Motors General Discussion

Total Harmonic Distortion of Portable Generators


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  #21  
Old 02-09-2018, 09:46:54 AM
Mikey NY Mikey NY is offline
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Default Re: Total Harmonic Distortion of Portable Generators

wayne, I would thing that for occasional use it may be better to not have that gasoline in it, unless he exercise's it religiously. I know natural gas conversion is not cheap, but on the other hand, it will no longer have portability, so many pros and cons.
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Old 02-09-2018, 11:05:24 AM
Wayne 440 Wayne 440 is offline
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Default Re: Total Harmonic Distortion of Portable Generators

I assumed that "very occasional" use of the set would include proper preparation for long term storage. If it will not, I agree.
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  #23  
Old 02-09-2018, 03:09:10 PM
Power Power is offline
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Default Re: Total Harmonic Distortion of Portable Generators

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Originally Posted by Mikey NY View Post
wayne, I would thing that for occasional use it may be better to not have that gasoline in it, unless he exercise's it religiously. I know natural gas conversion is not cheap, but on the other hand, it will no longer have portability, so many pros and cons.
If you want to have power in big events, like Texas, Florida and Puerto Rico storms, you cannot rely on natural gas. It is often shut off because of infrastructure damage or because the gas compressors loose power.
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Old 02-09-2018, 04:49:35 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Total Harmonic Distortion of Portable Generators

Natural gas will not affect voltage, nor operation of the engine under most conditions. It can affect power output (-20%) of the engine. This in turn may or may not affect the generator output under peak load. If the engine has more power than the generator needs to deliver and maintain maximum output, using NG won't affect operation. If engine HP is close to the needed HP input to maintain voltage/amp requirements (RPM), then using NG may be problematic. The engine might not be able to keep up with the demand. You would need to see the engine output specs as well as generator delivery requirements, to see if NJ will work for you.
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Old 02-09-2018, 05:20:07 PM
GeneratorNewb GeneratorNewb is offline
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Default Re: Total Harmonic Distortion of Portable Generators

So basically, is it not worth it to purchase a portable generator unless it is an inverter generator? The largest 1 I know of is the Honda eu7000is and that runs $4k.
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Old 02-09-2018, 05:26:31 PM
Power Power is offline
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Default Re: Total Harmonic Distortion of Portable Generators

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So basically, is it not worth it to purchase a portable generator unless it is an inverter generator? The largest 1 I know of is the Honda eu7000is and that runs $4k.
Read post 19.
Most inverter units produce modified sine waves.
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  #27  
Old 02-09-2018, 09:32:52 PM
Wayne 440 Wayne 440 is offline
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Default Re: Total Harmonic Distortion of Portable Generators

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So basically, is it not worth it to purchase a portable generator unless it is an inverter generator?...
I sincerely hope that isn't the case. I have a bunch of portable(*) generator sets and none of them are inverter designs.

*note - "portable" does not mean that lifting or loading machinery will not be required.
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Old 02-10-2018, 10:18:24 AM
Graycenphil Graycenphil is offline
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Default Re: Total Harmonic Distortion of Portable Generators

Some time back, someone on here tested a Honda EU6500 and found it had a pretty perfect sine wave. If that is true, I wonder if it might not be the best choice?

You will pay more for the generator, but you get a great generator. And you aren’t risking replacing expensive electronics on the furnace. Or, worse yet, not even being able to replace expensive electronics if they are only available from the manufacturer.

Might actually save you money in the long run.
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  #29  
Old 02-10-2018, 11:06:18 AM
Fred M. Fred M. is online now
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Default Re: Total Harmonic Distortion of Portable Generators

My impression is that the EU7000i Inverter is similar to the EU6500i Inverter, but the engine was updated.

I have the EU6500i, which was used during a couple of hurricane outages and an ARRL field day. I have not used it where I thought waveform was critical.

Fred
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Old 02-10-2018, 11:20:09 AM
Thaumaturge Thaumaturge is offline
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Default Re: Total Harmonic Distortion of Portable Generators

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Originally Posted by GeneratorNewb View Post
So basically, is it not worth it to purchase a portable generator unless it is an inverter generator? The largest 1 I know of is the Honda eu7000is and that runs $4k.
If question is mainly one of not damaging an expensive heater... exactly how much power does the heater draw? Walmart sells a 1000W pure sine inverter for ~$130. Charge a car battery off your generator and feed a pure sine inverter off the battery. Can you feed just the electronics controller separately? Amazon sells a pure sine 300W inverter fot ~$44.
Upwards from 1000W the price of pure sine inverters goes exponential.
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