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Old 06-22-2018, 09:41 PM   #21
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Originally Posted by Firedude26 View Post
website says 68 dBA
the 3500 inverted one says 59 dBA thats from the website.
Thx
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Old 06-22-2018, 10:28 PM   #22
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I own the Champion 4000/3500 like the one posted by 5 picker. Love it to death. Got it for $270 at Walmart. I have not tried to run it in a campground out of respect for people nearby. I have ran it side by side with a friends Honda 2000. The Honda is just about as loud when it is fully loaded but MUCH quieter when operating at a light load. The biggest surprise that I had was how much quieter another friends Harbor Freight 3200 open frame generator is! I donít know if they are all that quiet or he just got lucky. ( he bought it used). I was going to buy one until I found out how itís wired. Itís wired so that the effect is like having 2 1600 watt generators that canít be added together because the 2 sides are out of phase. With the Champion (and others) you can plug in the camper and get all 3500 watts (or whatever the generator is rated at) through one 30 amp plug. Open frame generators sound output doesnít change much with load. Not true with inverters! Hen this one dies ( if it ever does) I will get an inverter hybrid. Jay
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Old 06-22-2018, 10:37 PM   #23
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Originally Posted by garbonz View Post
Why have 2 2k generators when you can install a micro air easy start to you AC and save all that gas and weight?

I don't get it.


Not everyone is comfortable with installing it
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Old 06-23-2018, 08:20 AM   #24
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Noise is personal and subjective. One mans moise is anothers white noise in the background. While camping in an area with no hook ups, we were close to a nice diesel pusher. We all needed AC even at might. I could tell every time his came on. His factory, on board, generator was that loud. I run my Champion in the bed of the truck with the tailgate closed Can barely tell it’s running from three feet away inside the trailer. No one complained as far as I know. I need mine to run an oxygen generator machine
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Old 06-23-2018, 08:37 PM   #25
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What I have never understood is what is different in the construction of an open frame genny versus an inverter. How do inverters reduce their noise levels? Is it really that hard to retrofit an open frame so that it approaches the noise levels of an inverter? Anybody here done that?
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Old 06-23-2018, 10:51 PM   #26
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Open frame non-inverter generator runs at 3600 rpm continuously regardless of load in order to get 60 hertz alternating current.

Inverter generator are typically quieter because they are running most of the time below their max RPM. They do not need to be run at 3600 rpm and the engine's speed is dependent on load. At full load, an inverter generator may be as loud as an open frame except there is some sound dampening from the enclosure.
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Old 06-23-2018, 11:04 PM   #27
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I have a predator 4000, run the house on it during outages.
72dbm. I can hear it throughout the house when all closed up, but neighbors running the same unit and I don't hear his.
Had it for two years now and find it reliable, and only used once for camping, on private land.
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Old 06-24-2018, 12:18 AM   #28
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My understanding of inverter generators is is the generator is Direct Current that is put through a pure sine wave inverter to make nice smooth AC with a steady voltage. When the generator is not loaded very much the computer that runs the unit throttles the engine down. Usually inverter generators are in a plastic case which also helps with sound control. The hybrid that I mentioned in a earlier post is an open frame inverter generator. The typical open frame generator has an AC generator that has to run at 3600 rpm to keep a steady 60hz. Jay
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Old 06-24-2018, 01:45 AM   #29
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My understanding of inverter generators is is the generator is Direct Current that is put through a pure sine wave inverter to make nice smooth AC with a steady voltage.
It's actually an AC generator which is then converted to DC and then back up to 60HZ AC.
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Old 06-24-2018, 02:47 AM   #30
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It's actually an AC generator which is then converted to DC and then back up to 60HZ AC.

Correct. An for those nerds like myself, here is the whole detailed information, including the Yamaha Boost design:

https://patents.google.com/patent/US6819007
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