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Generators & Electric Motors General Discussion

Total Harmonic Distortion of Portable Generators


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  #51  
Old 02-11-2018, 03:12:44 AM
GeneratorNewb GeneratorNewb is offline
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Default Re: Total Harmonic Distortion of Portable Generators

I do currently have a whole house surge protector installed. Do thd /frequency variations have an adverse effect on motors like well pump?
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  #52  
Old 02-11-2018, 11:29:02 AM
Seafarer12 Seafarer12 is offline
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Default Re: Total Harmonic Distortion of Portable Generators

Has anyone mentioned a power conditioner for the sensitive electronics if your worried about them. Most small electronics have a power supply and run on dc.
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  #53  
Old 02-11-2018, 05:26:46 PM
GeneratorNewb GeneratorNewb is offline
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Default Re: Total Harmonic Distortion of Portable Generators

No but it doesn't seem like a cost effective solution if I want the entire 30 amp output to be conditioned. I saw some insanely high prices. I guess at this point I'm between using the generator I have and buying an additional Honda eu2000i. That would be solely for running the furnace. Or just springing for the Eu7000is. Does frequency control /thd have a material impact on motors such as well pump, garage door openers, etc?
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  #54  
Old 02-11-2018, 06:00:47 PM
Graycenphil Graycenphil is offline
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Default Re: Total Harmonic Distortion of Portable Generators

It seems that most household equipment runs fine on any generator. Most folks get by fine with mediocre generators. The biggest problem in a power outage is usually that the generator just quits, or wonít start in the first place. That said, high tech furnaces seem to be one of the exceptions. And in general, cleaner power is always better.

Just looking around, I saw this one that looks like a basically new EU6500 (if you trust the seller) for asking price of $2,800. Maybe heís flexible, or you can just keep your eyes open till something appears for the right price.

https://longisland.craigslist.org/gr...475483908.html
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  #55  
Old 02-11-2018, 06:15:47 PM
GeneratorNewb GeneratorNewb is offline
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Default Re: Total Harmonic Distortion of Portable Generators

That's actually a fantastic find. I'll see what he's willing to take. For around that price I'd much rather go for the Eu7000is as the fuel injection seems like a real game changer.
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  #56  
Old 02-11-2018, 06:17:32 PM
Graycenphil Graycenphil is offline
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Default Re: Total Harmonic Distortion of Portable Generators

The more I think about this, the more I find it annoying. Why would you make a product like these high tech furnaces that wonít run on a generator??!! Is this as cynical as them trying to make money on repairs, or is there some technical reason why it has to be this way? I kind of doubt the latter - if my computer, and all the other high tech stuff around the house works on dirty power, why canít the furnace?

Especially because heat is one of the things everybody buying a generator is going to want to be able to run. many folks buy a generator just for that reason - so the house wonít freeze when the power goes out in the winter.
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  #57  
Old 02-11-2018, 06:57:08 PM
GeneratorNewb GeneratorNewb is offline
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Default Re: Total Harmonic Distortion of Portable Generators

I couldn't agree more. $4k is a lot to spend on a generator especially when considering for a little under 7k I can get an automatic standby unit that will run most of the house.

I can get the 2kwh Honda unit to run the furnace but it seems pretty impractical to be switching between generators to run heat and other appliances. Especially if it's cold out. I think a large inverter or a standby are the only real choices.

I think I'm gonna have to bite the bullet and spring for thr eu7000is. The only other option is to buy a large gas fireplace insert which would get used both during the winter and during a power outage. The problem is our home is 3,300 sqft so it might not be enough. Although we do have another gas fireplace on the other side of the home.
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Old 02-11-2018, 10:11:21 PM
I like oldstuff I like oldstuff is offline
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Default Re: Total Harmonic Distortion of Portable Generators

Quote:
Originally Posted by Graycenphil View Post
The more I think about this, the more I find it annoying. Why would you make a product like these high tech furnaces that wonít run on a generator?
We have to remember that most devices are designed and tested on nice clean utility power. Sitting in an engineering room or the test floor it's likely nobody considered testing on a dirty sine wave input as the real world might encounter. Much less whip it with floating ground, no ground, earthed neutral etc as will be encountered with gensets.
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  #59  
Old 02-11-2018, 10:28:29 PM
GeneratorNewb GeneratorNewb is offline
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Default Re: Total Harmonic Distortion of Portable Generators

Very true, as I stated before, I read some posts of electricians stating that frewuen deviation and high thd can cause well pumps to overheat. Being that the Hondas use a pure sine wave, I'm thinking the Eu7000is will be ideal. Now I just have to talk myself into pulling the trigger. I guess buy once cry once.

In my development the power lines are underground so we are really only susceptible where the lines originate outside of the development. We lost power once for 6 hrs in the last 4 years but with a baby at home I get a little paranoid. Only other option is sticking with thr wh7500e and only using a space heater in a smaller room, some lights, and well pump.

For the summer I have a window ac I can throw in a smaller room as well (not sure how much that would be affected by the higher thd numbers).
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Old 02-11-2018, 10:51:26 PM
Graycenphil Graycenphil is offline
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Default Re: Total Harmonic Distortion of Portable Generators

There is a general rule that the likelihood of your losing power is dramatically reduced by getting a generator. Kind of like insurance; you may never need it. But if you do need it, it’s really nice to have.

Quote:
Originally Posted by I like oldstuff View Post
We have to remember that most devices are designed and tested on nice clean utility power. Sitting in an engineering room or the test floor it's likely nobody considered testing on a dirty sine wave input as the real world might encounter. Much less whip it with floating ground, no ground, earthed neutral etc as will be encountered with gensets.
I’m sure you’re right, but really, couldn’t somone figure out this might be an issue. I’m not an electrical engineer, but I do know about boilers and furnaces, and it seems to me it shouldn’t be too hard to design hadier controls.
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