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 > 3000W Chinese Gensets Info.

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professor95

Mechanicsville, VA

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Posted: 09/05/10 07:58pm Link  |  Quote  |  Print  |  Notify Moderator

When I was in Louisville at The Rally the end of July, I got to meet the guys starting up a company to provide accessories to the small generator market. One of the items they had on display was a tent-like cover for anything from a full size 3,000 watt Chinese generator on down. Their prototype “looked interesting” but I did not have any other details to form an opinion as to how well it would actually work.

Last week one of the guys at SuperGen Products gave me a call and asked if it would be OK to send me one of their GenTents. I told him that would be fine, but if I found any problems with the product I would report them just like the good data. He said he understood and was not asking for anything in return.

The white box arrived Thursday via FED-X. I opened Friday morning to see just what was inside.

The tent construction and workmanship is impressive. It is made of a heavy canvas-like material that has pockets for inserting rigid panels. The pockets close with Velcro. Unlike the prototype I saw in Louisville, the panels are now Adzel rather than Masonite. This means that the tent is completely weather proof and can be used as a cover even in the rain and snow. There are two end flaps that are for the muffler end that can be opened for running the generator or closed for weather protection. There is another Velcro panel on the top for access to the fuel tank or to open for extra air circulation to aid cooling.

The frame snaps together quickly and is neatly packed in a separate blue nylon bag. The entire unit folds flat for easy storage in a RV or truck.

OK, it is well made, but does it work to reduce sound from a Generator without overheating?

I set my “test” area up so that it was as close to what I would have with a generator connected to my RV in an actual camping space. The generator was several feet behind the camper. I measured out the requisite 7 meters toward the front of the camper and set up my sound level meter on a tripod about 4 feet off the ground.

I started the generator without the GenTent, let it warm up and turned on the 15,000 BTU air conditioner in the camper to load the generator. I measured a consistent 69 db with the meter set to the A weighting and fast response scales. Keep in mind that this reading is with the generator really loaded – not running in a no-load condition. Again, the 69 dbA reading was WITHOUT the GenTent.

I shut everything down and put the assembled GenTent over the generator. The back side of the tent where the muffler exits was open. The top flap was closed. There is about 3” of open space around the bottom.

I started the generator via the remote and once again turned on the 15,000 BTU air conditioner. With the generator loaded the meter showed a reading that varied between 61 and 62 dbA. That is an amazing 7 dbA reduction in sound on the front side of the tent. No measurements were made on the back side or the opposite end. I do not expect a drop in sound from the open or muffler end so it should be positioned away from your awning or any close neighbors.

The outside temperature was 86 degrees. I let the generator run for a full hour and 15 minutes. The generator was warm when I shut it down, but it did not overheat. I made some actual temperature measurements with an infrared non-contact thermometer. You can see what those numbers are in the photos below.

Over all I was impressed with the tent. It is extremely well made and should last a long time. It does significantly knock down the sound from the shielded sides.

One thing I would like to stress to anyone using this product with their air cooled 3,000 watt class Chinese generator – This is not an item to be used in 100 degree heat with a fully loaded generator. Air cooled generators need all the free air flow they can get under such conditions. My experience tells me a sound reduction enclosure such as the GenTent should only be used in “moderate” conditions under 90 degrees and at “moderate” loads not to exceed 2,400 watts. Occasionally checking the generator's temperature with a non-contact infrared thermometer would be a good idea. As you can see, they are no longer expensive items to own and have many other uses in and around a camper.

I intend to take and use the GenTent on all future boondocking trips where I am using either the 3,500 watt synchronous or the 2,000 watt inverter generator. I believe it will prove to be beneficial to even the Honda and Yamaha inverter crowd as it can help to further reduce annoying engine noise no matter what the make, model or current dbA rating may be.


The GenTent package before assembly.


Azdel fiberglass panel insert


Assembled GenTent


Generator Inside - End and top flaps open


Set-up for test site.


db meter is a measured 7 meters from generator.


db Meter Reading WITHOUT GenTent - generator loaded.


Meter reading with GenTent over generator - full generator load.


Generator tank temperature at start of test (2:50 p.m.).


Generator tank temperature at end of test (3:58 p.m.)


Generator end cap temperature at end of test. Well within acceptable protection limits for the AVR.


Professor Randy T. Agee & Nancy Agee. Also Oscar, the totally ruined Dachshund.
2009 Cedar Creek 5th Wheel - 2004 Volvo VNL670 class 8 MotorHome conversion as toter.
Turbocharged, 12L, 465 HP and 1,800 ft. Lbs. of torque.


bill h

hassayampa valley

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Posted: 09/05/10 08:23pm Link  |  Quote  |  Print  |  Notify Moderator

professor95 wrote:

No measurements were made on the back side or the opposite end. I do not expect a drop in sound from the open or muffler end so it should be positioned away from your awning or any close neighbors.



So, it appears that it is quieter for you but about the same for whoever the open end is aimed at.


NOTE: Any incorrect spelling is intentional to prevent those annoying popups.

84 Barth 30Tag powered by HT502/Thorley/Weiand etc, Gear Vendors OD.
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5akman

chico ca

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Posted: 09/05/10 10:10pm Link  |  Quote  |  Print  |  Notify Moderator

That is an amazing reduction for something so simple and so inexpensive. I contacted the company this last week and they said they'd be ready to take orders by this weekend. Sure enough, its available via their website with PayPal payment. And to think that I was just getting ready to buy cement board, stall mats and foil faced bubble wrap to build an enclosure that most likely would have cost more and done less!


2001 25' Keystone Sprinter 5th wheel, 2001 Dmax, CC, LB, 2wd, 285/75/16, with new injectors/head gaskets/CP3/water pump at 146,000. Rebuilt Mike L tranny and Trent Nell/EPR tow tune.

jlaustin

Crossville, Tennessee

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Posted: 09/06/10 06:36am Link  |  Quote  |  Print  |  Notify Moderator

The GenTent certainly looks well-built and I like the flexibility of having the option to open different panels!

My genset is receiver-hitch mounted and about 18-20" above the ground. In a very comparable test scenario as compared to the Professor's most recent test, my much-modified genset was getting about 65-66 db loaded with a 15K BTU A/C and I saw about 3-4 dB reductions with my homemade "Sound Shroud".

Do you think I might get further dB reduction with the GenTent? I'm wondering if because my genset is much higher off the ground, that accounts for less dB reduction? I'd rather not have to dismount the genset just to lower it to the ground. If I didn't get significant further reductions, how about making heavy "curtains" to extend from the bottom of the GenTent to within a few inches of the ground?


John & Linda
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professor95

Mechanicsville, VA

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Posted: 09/06/10 08:35am Link  |  Quote  |  Print  |  Notify Moderator

bill h wrote:


So, it appears that it is quieter for you but about the same for whoever the open end is aimed at.


Yep. Not good for the guys facing the open end in a crowded park or near a reflective canyon. But, hey - 3 out of 4 ain't too bad

Seriously though, in some testing I did a couple of years back with my folded poly board a sound absorbing barrier like a cedar tree or even a "<" shape with the greater end a couple of feet away from the open end does help to knock sound down from that direction as well.

I do think one of the things that is making the GenTent work so well is the AZDEL used in the panels. It is advertised as a sound and energy absorbing material which, apparently, it is.

professor95

Mechanicsville, VA

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Posted: 09/06/10 08:47am Link  |  Quote  |  Print  |  Notify Moderator

jlaustin wrote:



Do you think I might get further dB reduction with the GenTent? I'm wondering if because my genset is much higher off the ground, that accounts for less dB reduction? I'd rather not have to dismount the genset just to lower it to the ground. If I didn't get significant further reductions, how about making heavy "curtains" to extend from the bottom of the GenTent to within a few inches of the ground?


John,

I do not believe the GenTent would fit over your enclosure. If the company decides to build a larger tent for something like the 6,500 watt models there is a possibility.

Studying on this thing I honestly think that while the double thickness of canvas tenting material does a fair job of sound reduction it is the AZDEL fiberglass composite sandwiched in the middle that is adding to the reduction. On my end, I am curious to see what effect taking the ADZEL panels out may be.

Unfortunately, I have no idea where or how to buy a sheet of ADZEL - or even what it would cost if I wanted to try and use it as an additional sound reduction material on a homebrew enclosure.

I don't want anyone to get the impression that I think this thing is the answer to all of our noise reduction concerns. It did do a great job in my tests and the generator managed to stay withing operating range for temperatures. But, as Bill noted it does have a noisy end and as I noted it is not for use on HOT, HOT days with the genny running full bore. It is a neat, well made accessory but it does have its time and place.

bill h

hassayampa valley

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Posted: 09/06/10 02:34pm Link  |  Quote  |  Print  |  Notify Moderator

professor95 wrote:

in some testing I did a couple of years back with my folded poly board a sound absorbing barrier like a cedar tree or even a "<" shape with the greater end a couple of feet away from the open end does help to knock sound down from that direction as well.


Yep. Anything that makes the sound turn a corner helps. An absorbent material there helps more yet.

Quote:

I do think one of the things that is making the GenTent work so well is the AZDEL used in the panels. It is advertised as a sound and energy absorbing material which, apparently, it is.


Have you seen any STC or NRC figures on it? My cheapie Soundstop board is not very durable, so this might be a good substitute. I like their idea of slipping it into a double wall tent. Maybe I will sew up a hoghouse and slip the Soundstop in it. A waterproof material would save the absorbent Soundstop from the rain.

jlaustin

Crossville, Tennessee

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Posted: 09/06/10 02:37pm Link  |  Quote  |  Print  |  Notify Moderator

professor95 wrote:



John,

I do not believe the GenTent would fit over your enclosure. If the company decides to build a larger tent for something like the 6,500 watt models there is a possibility.



I mean't placing it over just the genset, not the homemade enclosure I made. Guess I shouldn't have used the term "further" reduction - I mean't would I get a greater reduction with the GenTent vs my enclosure, or, in your opinion, would the height of my genset above the ground probably reduce the effectiveness of the GenTent?

I guess the other way to put it - does raising any enclosure more than a few inches above the ground reduce the effectiveness of the enclosure?

professor95

Mechanicsville, VA

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Posted: 09/06/10 03:58pm Link  |  Quote  |  Print  |  Notify Moderator

bill h wrote:


Have you seen any STC or NRC figures on it? My cheapie Soundstop board is not very durable, so this might be a good substitute. I like their idea of slipping it into a double wall tent. Maybe I will sew up a hoghouse and slip the Soundstop in it. A waterproof material would save the absorbent Soundstop from the rain.


Nope, I have not seen any STC or NRC figures. This is all I have seen concerning technical info. The figures there are kind of "fuzzy".

Azdel sponsored the transportation at THE RALLY in Louisville and each participant received a small 2" circular piece in their Rally Bag along with a brief flier. That is the first time I had even heard of the stuff. But, I think it is great and expect it to expand quickly for use in the RV industry and who knows where else?

It's made in Lynchburg, VA, which is only about 110 miles from me. In fact, I used to live in Lynchburg. So, if I ever decide I want a few sheets I will just drive there and visit a few old friends along the way. But, until it starts appearing in Lowe's or HD stores I imagine it will be difficult to come by without paying a lot in freight. BTW, I do not know the cost of a 4x8 sheet either.

SuperGen Products is registered as a business in Las Vegas and that is where I think their warehouse and manufacturing facility is located. Apparently they ordered a sizable pack of the stuff to be able to afford shipping out there.

professor95

Mechanicsville, VA

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Posted: 09/06/10 04:22pm Link  |  Quote  |  Print  |  Notify Moderator

jlaustin wrote:

......... or, in your opinion, would the height of my genset above the ground probably reduce the effectiveness of the GenTent?

I guess the other way to put it - does raising any enclosure more than a few inches above the ground reduce the effectiveness of the enclosure?


The ground, especially soft dirt, sand, grass and even gravel offer excellent sound absorption and reduction characteristics. Harder surfaces like concrete and asphalt don't work as well. There is a dividing line with a generator cover that allows for cooler air at the bottom to be pulled into the opening and sound to not escape. I am of the opinion that the line is right at 3" for optimum results. Think about the difference in sound of mower blades spinning when you move from the lawn to the driveway. On my 50", 3-blade ZTR mower it goes from a whirr to a roar. So, just putting a cover over your elevated generator would help, but not as much as it would if it were sitting on soft ground.

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