Forum Discussion

deltabravo's avatar
Feb 21, 2022

Upgrades to make my generator quieter

Early last summer I installed the new Cummins Onan 2500i inverter generator in my AF 992. Later in the summer I added the Cummins Onan resonator

I did some sound comparisons with and without the resonator in this video

Without the resonator, If you are standing off to the side, at a 90 degree angle to the exhaust, you don't really hear the sputtering as much as you do if you are anywhere less than 90 degrees, and closer to the exhaust.

What I noticed after watching other videos on the resonator is that it makes an even bigger difference in noise reduction on the non inverter generator - the sputtering those make is pretty obnoxious.
If you have space to install the resonator and use your onboard genny a lot, it's a worthwhile upgrade.

Even without the resonator, the new inverter style gen is quieter than the generator I removed, as compared in this video sound test old vs new

My intention was to install the new gen in a TT I had, but I abruptly decided to sell the TT. I had already purchased the new gen, so I needed to put it to use. I decided to install it in the 992.

Before I installed the new gen, I installed some sound deadening mat in the gen compartment. Someone in the AF truck camper group recommended it.
Here's a short video describing that project: sound deadening mat in gen compartment
  • HMS Beagle wrote:
    time2roll wrote:
    Has anything been done to reduce generator run time?

    Solar. I don't have a genset and haven't plugged the camper in to the wall in several years.

    I reckon that question was directed at the OP....
  • time2roll wrote:
    Has anything been done to reduce generator run time?

    Solar. I don't have a genset and haven't plugged the camper in to the wall in several years.
  • I'm glad this is a "telling how" and not an "asking how" thread.
  • I'm glad you found a solution, but if I ran for an extended period of time, I'd buy a Honda. That being said, I don't have an issue at all with running my 16 year old Onan for 30min - 1 hr to top off my batteries.
  • I wrapped my microlite with mineral wool insulation Of course leaving all areas where the air flows and exhaust areas. This made my generator on my class c incredibly quiet. Mineral wool does not burn until over 2000 degrees and does not mold or absorb water. Pack a little around your generator I think you would be pleasently suprised.