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Looking for the Quietest Dual Fuel 9000w+ Generator?

That would be cool. :)

Part of this is defining exactly what one wants. This thread/discussion has helped clarify that what I actually want is low noise (<50db would be fantastic) *for my neighbors*.

And then to avoid the zombies of course - but this is secondary.
Ok, so, ya need to excavate a bunker below the bedrock, have a water table above it, isolate it from the gravity well of the planet, and engage the bergenholm to free the entire system.

Anybody on here an E.E. Doc Smith fan?
 
Exactly.
Some on here think the noise is from the exhaust, and most of the noise isnt...

Then again... some of us just like to argue.
I agree the 1.5" exhaust coming out the wall of the shed was LOUD! But I mitigated that with a 24" long baffle box with 2" rockwool (exhaust wen thru chambers with no direct path for sound). It took the sharp noise down but I was still left with significant deep throated noise and was annoying in it's own way. Overall, at the property line I still had 70db.
 
Not sure what you are suggesting here.

A car engine has a water jacket and a LOT of metal dampening mechanical noises.

An air cooled generator engine does not... the exhaust is a very small part of the noise.
Thats a point I was trying to make.
You explained it in greater detail.

Sometimes its just better to learn these things by taking your car apart and trying to hush your Chinese generator with all the bits and pieces
 
OK...

The build a generator quiet shed, it needs air intake and exhause with air sound dampers. The FLOOR needs to be lines with foam, or some sound absorbing surface, the 2x6 walls need dense pack fiberglass open face with sealed surface on the outside of the building. No sheetrock reflecting inside noise.

The generator needs to be mounted to the concrete with isolation mounts.

The exhaust needs to be double wall pipe, and have a thimble wall penetration.

Airflow is key to keeping a portable generator functional.
Zombie box might be easier.
 
Not every day - just as emergency backup. Part of this is I'm just annoyed at how bad noise mitigation turned out with shed! so I want to continue to experiment.

I'm going to try the dual GenMax 4600 wtih parallel kit. I can compare this with my existing Champion and report back eventually.

My new plan is to run the generator on the outside of the shed - you can see the Champion 8000w here - and measure dBA at the property lines and compare. One neighbor is behind the shed, the other neighbor is to the right ~10ft with fence.
You live in a situation that is much like mine, the neighbors are not that far away and you cannot put the Genny 200ft from your house.
I know you may not want to hear it but the only solution that works well in this situation is a Honda EU-7000 or get the EU-3000 and live with less charging capability.
I know it's a lot of money but it lasts for decades with just oil and filter changes.
The noise level will be so low that you won't be able to hear it in your house and you can run it without fear that the neighbors will come after you with pitch forks.
This is why so many people on here are letting you know that they own a Honda EU series generator, it is what you will end up with after trying 2-3 more cheaper generators. Trust me I know, I gave away the other one's to friends almost 19 years ago.

BTW is that not that a Honda EU-3000is in the picture taken after the fire?
 
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You live in a situation that is much like mine, the neighbors are not that far away and you cannot put the Genny 200ft from your house.
I know you may not want to hear it but the only solution that works well in this situation is a Honda EU-7000 or get the EU-3000 and live with less charging capability.
I know it's a lot of money but it lasts for decades with just oil and filter changes.
The noise level will be so low that you won't be able to hear it in your house and you can run it without fear that the neighbors will come after you with pitch forks.
This is why so many people on here are letting you know that they own a Honda EU series generator, it is what you will end up with after trying 2-3 more cheaper generators. Trust me I know, I gave away the other one's to friends almost 19 years ago.
Agree - the message is getting clearer.
(And appreciated! as that's the purpose of starting this thread)

BTW is that not that a Honda EU-3000is in the picture taken after the fire?
Yes, I have a 23yr old Honda eu3000is that continues to run very well - including a propane conversion kit about 6 yrs ago.
1721981560162.png
 
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Thanks for all the comments/inputs. Looked AGAIN at the Honda eu7000is (plus my personal experience with my eu3000is) and the dBA specs are just lower! I understand dBA to be to be algorithmic in noise as the metric increases - so the 50-60dBA range of the eu7000is is significantly quieter than the 60-70dBA range of all the others - ones listed in my 1st post.

Just made an order and found a $477 ebay propane conversion kit. @DavidPoz did an eu7000is -> Chargerverter and he got 90a @53.6v, and even 100a @ 53v - close enough. And I can always run a 2nd Chargeverter with my eu3000is to get 130-140a total.

Again, thanks for the discussion!
 
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Thanks for all the comments/inputs. Looked AGAIN at the Honda eu7000is (plus my personal experience with my eu3000is) and the dBA specs are just lower! I understand dBA to be to be algorithmic in noise as the metric increases - so the 50-60dBA range of the eu7000is is significantly quieter than the 60-70dBA range of all the others - ones listed in my 1st post.

Just made an order and found a $477 ebay propane conversion kit. @DavidPoz did an eu7000is -> Chargerverter and he got 90a @53.6v, and even 100a @ 53v - close enough. And I can always run a 2nd Chargeverter with my eu3000is to get 130-140a total.

Again, thanks for the discussion!

Good luck and let us know how it works.

Your neighbor situation is just plain challenging. The max allowable mechanical noise at a residential property line in Seattle is 55dbA during the day and 45dbA between 10:00 p.m. and 7:00 a.m. Poorly installed water heater and furnace exhausts run above that and are terribly annoying even 20 feet away. Trying to keep a generator below that in a city will be tough.
 

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