Generator box

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THE WILD DOG
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2012/03/25 23:29:37 (permalink)

Generator box

Finally got to the point where I could mount and enclose my generator. Called the MANFAN and asked what the best way to do it and they told me that it is ok to enclose the sides and the top but to leave the front and back open for venting and air flow. So I took their advice and this is what I came up with. I still have to cut an access panel on the left side for my fuel cut off switch, choke and emergency pull start option, but that is another day.



 
 
post edited by THE WILD DOG - 2012/03/25 23:30:49
#1

16 Replies Related Threads

    Stirfryking
    Junior Burger
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    Re:Generator box 2012/03/26 21:25:31 (permalink)
    Dang! Now that's a big generator dog! What kinda cargo carrier are you using? I got Harbor freights 500lb.cap. Carrier for my 7550w gen. I think it's going to be too narrow and it feels frail. Questionable on the bumps. I will have to alter or return and go bigger. Also, did balt. Co. inspectors require a box? City has a 58 decibel max.
    Plus I've been trying to catch up to you anyway, I'm leaning toward the county myself now but logistically can't find the"sweet spot". We need to talk ;) if for nothing at all, just to meet the comp. Personally I wouldn't mind an ally in a concrete jungle.
    #2
    Stirfryking
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    Re:Generator box 2012/03/26 21:28:29 (permalink)
    P.s. Your trux looking tight. Can't wait to paint mine.
    #3
    THE WILD DOG
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    Re:Generator box 2012/03/27 01:23:05 (permalink)
    I built my own box, Total cost was about $150 including the 1/4" steel plate it sits on, The aluminum cost me about $70 and it's free cuts. I got it all locally. Check out these guys, they are in Golden Ring right off of golden ring road. http://www.metalsupermarketsatl.com/  ask for JOE, tell him The hot dog guy sent you if you go there.  I went with 1/16th aluminum 5051
    #4
    Bistro a go-go
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    Re:Generator box 2012/03/27 08:17:24 (permalink)
    i just bought that same generator. actually traded a walk behind ditchwitch for it. its loud and proud so i gotta figure how to make it like a ei3000 honda,...holding my breath
    #5
    THE WILD DOG
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    Re:Generator box 2012/03/27 11:16:53 (permalink)
    I avent fires mine up yet. Is it really loud?
    #6
    marco226
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    Re:Generator box 2012/04/12 13:41:40 (permalink)
    can you tell me where you got you generator. model# and make. i am loving your bulid. paint is awsome!!!
     
    #7
    Dr of BBQ
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    Re:Generator box 2012/04/12 16:03:00 (permalink)
    Quiet your noisy generator with an automobile muffler

     http://www.roadfood.com/F...amp;high=generator+box
    The Dr of BBQ
    #8
    Midnights
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    Re:Generator box 2014/02/22 23:59:59 (permalink)
    I am in the process of building a generator box. It will be something like this:
    http://www.d33z.com/2013/02/generator-cabinet.html
    It will be on a cargo carrier, so I figured I could leave the bottom mostly open. The only real issue I'm having is what insulation to use. Someone on YouTube used synthetic cork tile underpayment.
    http://www.wayfair.com/Wa...per-Sheet-WRM1074.html
    It's rated to be used on flooring with hearing elements, so it'll handle the heat. I don't know how much it actually dampens the sound though. The YouTube video maker was ultimately not happy with how his box came out.
    http://www.youtube.com/watch?v=EujojffYOmU
    I thought about the egg crate acoustical foam. I found cheap panels on eBay, but I'm not sure how they'll handle the heat.
    http://www.ebay.com/itm/1...X-12-X-2-/271392877108
    Another option would be the foil-faced polystyrene insulation. It looks like it would handle the heat, and would hold up to some abuse.
    http://www.lowes.ca/sheet...ed-sheet_10727733.html
    http://www.lowes.ca/sheet...ed-sheet_g1545376.html
    I don't see fiberglass insulation as working all that well because it doesn't seem like it would hold up to the abuse of the road.
    The foil bubble insulation designed to wrap water heaters seems like it wouldn't really dampen the sound all that much.
    http://www.lowes.com/pd_1...Binsulation&facetInfo=
    post edited by Midnights - 2014/02/23 11:05:59
    #9
    Midnights
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    Re:Generator box 2014/02/23 01:08:12 (permalink)
    The insulation seen here looks promising:
    http://www.campertrailers.org/soundproof_box.htm
    #10
    RodBangkok
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    Re:Generator box 2014/02/23 02:15:13 (permalink)
    Any single wall box will not provide soundproofing.  You need to isolate the unit and also build multiple enclosures with a sound buffering lining and an air space between the layers.  We use a 3 layer box similar to what is shown here.  A small radiator fan running from the 12 volt port on the generator provides air flow, and a small car muffler is used to replace the gens muffler.  Isolation mounts are a must, takes more work and more space, but does work well.  
    This site may help:
     
    http://soundproofing.org/infopages/generator.htm
     
     
    #11
    Midnights
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    Re:Generator box 2014/02/23 11:24:52 (permalink)
    Rod, do you have problems with overheating? Everyone I've seen who has done the 3 layer box has ended up burning up their generator. I figured a single wall box with some insulation would work as I've seen many people do it. The box will have openings anyway for airflow, so it would be more sound dampening than soundproofing. I just need to get it to reasonable levels, not so quiet I don't hear it.

    This radiant barrier looks like a possibility, perhaps on top of a layer of Homasote.
    http://www.homedepot.com/...4/100661257?cm_mmc=sem|psocial|fbx|dynamic

    The insulation for car engine compartments look much like this radiant barrier.
    http://www.ebay.com/itm/3...ame=STRK%3AMEBIDX%3AIT
    http://www.ebay.com/itm/2...ame=STRK%3AMEBIDX%3AIT
    http://www.ebay.com/itm/1...ame=STRK%3AMEBIDX%3AIT

    It looks like the stuff that they use to enclose generators in boats would be great, but it is pricy.
    http://discountmarinesour...-sound-insulation.aspx
    http://www.soundproofcow....ecialty-Composite.html
    http://www.sailorssolutio...Category=Engine%20Room
    http://www.soundproofcow....erglass-Composite.html
    Tips and hints:
    http://www.cruisersforum....rtment-tips-58028.html
    http://deepplaya.com/engine-sound-proofing/
    #12
    RodBangkok
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    Re:Generator box 2014/02/23 16:48:34 (permalink)
    No overheating, but you need to insure you have a large fan, and enough air space between the box layers to allow for good air flow.  It takes up space to do it that way and I suspect people that have tried did not get a large enough air flow area or their fans were too small.  The air gaps where the air flow runs can be larger than those on the other sides of the boxes.  Sound does not like to go around corners, so its like making a maze, to let air in, but not sound.  
    To monitor the engine air temp you can use a marine type temp gauge for an engine compartment.   A lot of what we've done in this area is taken from marine designs and know how.  If you don't have the luxury of the necessary space, then try and use isolation mounts for the gen, and perhaps two walls.  Don't dismiss isolation of the unit, as a lot of the noise is transmitted via vibration.  So rubber or spring type mounts help a lot.  And isolate the inner box also.  In the motion picture industry its called blimping, you might find some info by googling with that word.
    #13
    Midnights
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    Re:Generator box 2014/02/24 11:46:45 (permalink)
    This Amazon review of the Generac 17500 has a bunch of tips and hints:
    http://www.amazon.com/rev...&store=lawn-garden
    Make sure to read the responses. He put pictures of the process up here:
    https://plus.google.com/p...uthkey=CIq9l-2e6u2luwE
    #14
    ishandchips
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    Re:Generator box 2014/02/24 18:29:18 (permalink)
    Could this kind of box be possible on a Grumman Freightliner using a Cummins Onan QD 7500 watt diesel generator weighing in at 420lbs? There's no space in our truck for a generator so it needs to be on the exterior mounted on the step at the back of the truck. Is it feasible?

    Thanks! 
    #15
    Midnights
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    Re:Generator box 2014/02/24 18:48:16 (permalink)
    I would imagine so. I'm putting a Generac 17500 which weighs roughly the same on the back of mine. I will be using a ratcheting strap on the outer edge of the generator box attached to the top of my truck, so the weight isn't solely on the tow hitch.
    #16
    ishandchips
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    Re:Generator box 2014/02/24 18:50:54 (permalink)
    Midnights

    I would imagine so. I'm putting a Generac 17500 which weighs roughly the same on the back of mine. I will be using a ratcheting strap on the outer edge of the generator box attached to the top of my truck, so the weight isn't solely on the tow hitch.

     
    Post pics when your done! Wouldn't mind seeing the end result :) Thnx!
    #17
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