Honda 2000 quiet box, I'm back!!

Thanks for the input greatly appreciated. The intake end of the generator is fairly simple and not the greatest source of noise. It is building a exhaust baffle in a limited amount of space and without spending a fortune. For the body of the generator I have done Composite foam with MLV and a lead floor and works very well. I have also done a sound deadener like Blue Skin for the metal box and 1" fiberglass duct board. It works well, not silent but good enough. Similar to what RaD did.

63 to 48 is very impressive even more so if the gen does not burn up!


I need weather proof, secure, as light as possible and not break the bank. jaguston's did a great job with his but I cannot find the link.

One person suspended the genset on rubber straps to stop vibration. Not practical for my application. The Japanese like to make springs for the feet of the genset.

RaD did a good low cost job. https://www.youtube.com/watch?v=kuRd-ZPeaoQ

https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/21111126/srt/pa/pging/1/page/1.cfm

Two more studies:
Wood box with a partial baffle and used ~1in think fiber glass insulation ~7db reduction
https://www.ajol.info/index.php/jasem/article/download/135141/124634

FRP panels with `2in Rockwool and no baffle ~18db
https://www.academia.edu/download/67787833/31568.pdf

What no one seems to have done yet is study a panel box built like this:
FRP | Mass loaded vinyl | Rockwool | Metal screen (think bird screen)

And then you would also need a baffle with at least two chambers.
I built a wooden box with a two-chamber baffle for the air intake and one for the output but used a significantly lesser sound absorption product than the Rockwool and got a 5db reduction in noise.

My next project will be built using the panel design above and the baffles. Of course, I need time to do it. :)

Great link. I followed the video to their page where they sell the Eco Route Silent Box. For the Yamaha ef2800ise the products costs $1,721.71. Looks like a metal shell with some sound deadening built in. The magic being the sound baffle box they designed for the exhaust end of the generator. If they used mlv on the shell, they could likely knock a few extra DB out of the overall box.

This guy described how a sound baffle works for exhaust nose the best I have seen and shows how he built his box. He also sells some very nice plans for wood generator enclosures and claims up to 5X sound reduction. https://www.youtube.com/watch?v=_qPRIq-9U-4

There is a 2003 study from India titled “Studies On Control Of Noise From Portable Power Generator” by Parvathi and Gopalakrishnan that looks at some unique ways to start deadening sound (should be some better studies since then but I have not yet followed up). I used their bed of sand trick on a whole house generator I had, and it worked as advertised. But the video I posted above appears to be the best homemade project yet.

I did drop the DB in my boat from 63db to 48db by decoupling the generator from the flooring using spring mounts I designed and had built. Since you appear to be wanting to use an inverter generator if you are going to mount it to your RV I would suggest floating the whole box in springs like the ones used in the HVAC industry to quiet hvac equipment. For my project, I used the springs out of a Mason CA-310
Mason CA-310 Spring kit
But you could likely just use valve springs.

Good luck and I would really like to see what you do and learn from your successes and failures.

Moderator edit to fix URL.

Wish I could see how they designed the exhaust end of these box's

https://youtu.be/8PwVfIwj8f0

Adequate ventilation is the key IMO.