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Old 08-04-2008, 09:17 PM   #1
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Question Portable Generator Sound Levels: One Honda EU2000i vs. Two Paralleled Honda EU2000i

Does anyone have any real world experience with the difference in sound levels between running one Honda EU2000i portable generator vs. running two Honda EU2000i portable generators in parallel? Honda claims only a small increase in sound level (dB) output, but I'm dubious. I sure would like to know before I buy. I don't want to have a noisy camping experience and I'd certainly hate to have my campground neighbors hating me!
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Old 08-04-2008, 09:35 PM   #2
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Not sure but I will have 2 running this weekend

I have just ordered a 2nd EU2000 and the parallel kit and will run the set this weekend and report back. I had to use the two generator approach because lifting one 3K yamaha or honda was going to be too heavy.
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Old 08-04-2008, 09:37 PM   #3
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I have a pair of 2000i's and have run both one and two together. I can not really notice any significant increase in sound when running both. When both are running, you can still hold a conversation right next to them.

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Old 08-04-2008, 10:49 PM   #4
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Quote:
Originally Posted by AndyPenny View Post
...Honda claims only a small increase in sound level (dB) output, but I'm dubious...
the specifics are covered in this thread, posts 9 and 13...

http://www.airforums.com/forums/f448...00i-35433.html

with more back ground in this post...

http://www.airforums.com/forums/208822-post12.html

and many reports spread out in the genset threads that 2 sounds basically the same as one...

and when LOAD is considered there will be times when 2 runny will generate LESS noise than 1 at near capacity...

cheers
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Old 08-04-2008, 11:34 PM   #5
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Quote:
Originally Posted by AndyPenny View Post
Does anyone have any real world experience with the difference in sound levels between running one Honda EU2000i portable generator vs. running two Honda EU2000i portable generators in parallel? Honda claims only a small increase in sound level (dB) output, but I'm dubious. I sure would like to know before I buy. I don't want to have a noisy camping experience and I'd certainly hate to have my campground neighbors hating me!
Ordinary acoustics states that when you double the noise, such as you would with two equal sized generators, you only increase the sound level by 3 (three) decibels.

Most humans can barely detect 2 decibels.

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Old 08-05-2008, 07:00 AM   #6
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The inverter type generators in general, compared to their counterparts (non-inverter type) are significantly more quiet. As Moosetags stated, he can still have a conversation with two of them running.

Last night's storm knocked out power to my parents subdivision. I brought my little 1000 Yamaha LP over to keep their fridge from spoiling. Then we walked over to the neighbors who had a 5500 watt non inverter generator with a 10hp motor running. You could NOT even remotely have any conversation and hear the other person within say 5-6' of it (and it was nowhere near full load...hard pressed to be even at 1/4 load), while you could speak softly around the inverter generator.

I don't know if the Hondas have the eco feature, which can also help reduce dbs. The Yamaha I have when there is a call for more power, it ramps up the RPMs. Demand decreases, the engine slows a bit, saving fuel and reducing dbs.
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Old 08-05-2008, 08:16 AM   #7
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I had a question

What about the third frequency created by the sum difference of the two motors unavoidably operating at two slightly different frequencies?
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Old 08-05-2008, 08:39 AM   #8
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What about the third frequency created by the sum difference of the two motors unavoidably operating at two slightly different frequencies?
The inverter type gensets that support parallel operation phase lock with any AC detected on the output line.

That is why you can't just parallel any two gensets because only the inverter models, and really only a few of them, have the electronics to handle this problem.

(it's also why the output of these gensets is typically quite a bit cleaner than you get even off the grid)
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Old 08-05-2008, 09:08 AM   #9
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Quote:
Originally Posted by mandolindave View Post
What about the third frequency created by the sum difference of the two motors unavoidably operating at two slightly different frequencies?
Wow- that's really forward thinking!! ever spend any time on a C-130?

I put my Honda 1000 just a few feet from the tongue opposite the entry door. Then I put a fold up chair next to it with a swim towel draped over the chair. This almost puts the thing into the stealth mode!
I have noticed that others with the H2000 seem to run on eco mode more than my 1000 tho, all about the load. So many times the 2000 is quieter!
and I've witnessed many 2000 hooked together, I could not tell any difference in db level. The air conditioner thats being powered maked more noise than the Honda.
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Old 08-05-2008, 10:23 AM   #10
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The questions are usually matching electrical, not sound. The electrical has defined frequencies. The sound has no predominant frequency from anything I can tell.

Your biggest sound problem is probably going to come from resonance, such as a truck bed the genset might be sitting in. I think that is usually minor compared to shadowing or reflective effects.

It does help to avoid spaces with walls on two or more sides (such as between rigs) and to make sure that the gensets are on the other side of the rig than the social side.
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Old 08-05-2008, 11:34 AM   #11
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I hear Jenny singing

I percieve generators making a sound, or note(s). When I am in a twin engine aircraft, and the engines are running at a slightly different RPM, I hear a slow pulse. It drives me crazy after awhile.
I think I understand now that the two jennys are syncronized as far as electrical output. Now I am curious to HEAR two 2000's running.

Sorry, it has been rumored that curiousity killed the cat by hitting it over the head with my mandolin.
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Old 08-13-2008, 08:04 PM   #12
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I have 2 as well!

We run two Eu 2000i's as well. They do seem to run in a synchronized tone. My other addiction that goes well with camping is going to Nascar/Indycar races.

The tracks have no hookups so you get to dry camp for 1 week. Often times you will need A/C so the gennys work great. I've come up with a contraption that works great for extending the amount of running time that you can get out of the two gennys. I'll see if I can find the post and will attach it here for those that are interested.

Cheers!
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Old 08-13-2008, 08:05 PM   #13
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Here's how I did it.

You can save youself a bunch of money by just buying a marine gas tank, 2 marine fittings and a marine hose w/squeese ball. One marine fitting is threaded into an extra generator cap the other marine fitting is threaded into the gas tank. All parts except the gas caps were at Academy Sports. I recommend buying a new gas cap for your marine fitting because that allows you to remove it and put on the 'stock' cap for travelling.

When I'm ready to crank them up, I just set my marine tanks beside the generators and fire them up. Because all of these parts are for marine application they are heavy duty and safety oriented.

I did this set up for both of my 2000i's and I spent a little under $100 for both generators.

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Old 08-13-2008, 08:16 PM   #14
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I bought an EU2000I honda inverter generator used. I have no manual. Can somebody please tell me the correct oil to use in this machine. Much appreciated!
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