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NorthOrSouth
Explorer
Jun 24, 2015

Diesel generator just a bit too loud - how to quiet it down?

1992 Monaco Dynasty DP with a Kohler genset (Yanmar 3 cyl diesel 1.4 liter engine - 9Kw)

This genset is huge in capacity, size and weight. IF we lived down south and needed to run the dual AC AND everything else inside I doubt we could overload the thing.

But the thing is, we live up north, boondock quite a bit and we rarely run more than one AC if at all. Fans and the powered roof vents do a good job most of the time and the AC on a really hot day.

The main thing is the genset is quite loud just because it's a big Yanmar in an open area under the front seats. I don't mind running it in a parking lot or on a street where we are not close to a house but its an issue in a national park or near homes. Its definitely not a Honda.

Is there any way to quiet down a big diesel genset like this? Its a permanent mount (no slide tray) up front and it needs lots of air flowing in and down to keep it cool but would it help to mount sound deadening insulation on either side? or maybe 6" below the bottom air exit? Maybe a bigger muffler?

The other option I'm leaning toward is taking it out altogether and putting in our yard as a backup for our home (9 kw should easily run the whole house) and putting in a much quieter Honda genset. I think 3Kw to 4Kw would suffice for 95% of what we do. I assume that would have to be a gas unit so we'd be carrying two fuels but I think the quieter atmosphere might make up for it. Or is there an option for a quiet diesel?

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