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Old 02-03-2017, 03:18 PM   #1
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Sealed compartment for generator

I am building a raised platform in the back of our shuttle bus for a queen bed. I have a door that would allow access to under the bed from outside.

I would like to figure out a safe way to seal off a section of this raised storage area for a honda generator that would be accessed from the outside only. I would install vents in the door for air intake and extended the exhaust overboard. I would also be sure to have a CO detector on the bus.

How would you go about build such a box? I was thinking marine grade plywood. Caulked at the seams. Foam board insulation with a reflective surface to deflect heat away from buses interior. But this all seems to simple.

Any ideas??
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Old 02-03-2017, 03:25 PM   #2
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If I was doing it, I would fab up a box out of sheet metal with welded seams and then insulate it on the interior of the bus (exterior of genny box) and a maybe some sort of dynamat on the inside of the box.

Maybe have some sort of mounting plate attached to heavy springs to isolate the vibrations of the genny too...

I would just feel more comfortable with the genny humming away in a welded steel box rather than caulked wood. Especially if my kid was going to be sleeping in there.

But that's just me... I tend to overthink stuff like this though.
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Old 02-03-2017, 03:57 PM   #3
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I definitely 2nd metal.. if anything went wrong and something caught on fire youd have a fighting chance of getting it out before much damage occured in a metal box but in wood it would spread very quickly..

definitely make sure its vented.. even when not in use it can produce gas fumes that could be explosive..

-Christopher
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Old 02-03-2017, 03:57 PM   #4
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Quote:
Originally Posted by slaughridge85 View Post
I would fab up a box out of sheet metal with welded seams and then insulate it on the interior of the bus (exterior of genny box) and a maybe some sort of dynamat on the inside of the box.

Maybe have some sort of mounting plate attached to heavy springs to isolate the vibrations of the genny too...
I was thinking of some sort of sheet metal box. I don't think it's over thought at all. It is only going to be a little honda generator, so springs might be overkill and I would like to pull it out if I needed to.

Keep the ideas coming
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Old 02-03-2017, 04:09 PM   #5
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look into computer rack slide rails.. office surplus liquidation houses often have a bunch of them. they are designed to take quite a bit of weight, you could mount the generator on a moveable slide to get it in and out that way..

-Christopher
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Old 02-03-2017, 05:16 PM   #6
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I have a Champion 3500W generator, probably heavier than what you have in mind for yours, and I mounted it on IBM rack-mount server slides. Actually they're Accuride 3307-28 slides, and they work just fine for the generator's 100 lb weight, even at full extension. To handle the exhaust when the gen is slid all the way out, I used a short length of 1" CSST stainless flexible gas pipe (with its plastic sheathing taken off!) from the muffler to a 1" galvanized pipe that slides inside a length of stainless tube which is the exhaust pipe that exits near the driver's-side front wheel. The whole telescoping exhaust slopes down so water cannot accumulate inside it and rust it internally. So far, so good.

I also mounted the gen on some extra rubber shock-absorbing blocks - these make a big difference to the low-frequency drumming vibration, but obviously they don't do anything for the higher-frequency noises and mechanical clatter.

One significant difference however: I only use my generator when parked, never while under way. If you plan on using a non-RV type of air-cooled generator while moving, you really need to think about ventilation and where the exhaust will go. You could have carbon monoxide being drawn back inside the bus because of the natural airflow inside from rear to front as you drive. Use CO and CO2 detectors, and be very careful.

Good luck, John
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Old 02-03-2017, 05:32 PM   #7
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Under body truck box maybe

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Old 02-03-2017, 05:41 PM   #8
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Even a little Honda genny if(?) bolted solid or just sitting on metal could/will transfer vibration.
There are many options.
Research vibration isolation
And if you want to go the electric start route then you could add a relay that starts an intake air fan(regardless of size) into the box for fresh air for the genny in a truly sealed box.
Either way a genny in a box needs specific air intake requirements and most gennys are not made to be in a box unless they are vented can breath properly in and out.
Consulte the manufacturer for the specific requirements of what you would like to buy and discuss it with them before the actual purchase.
There are ways around things? Like I am going to adapt a car muffler to my old craftsman genny for sound and still keep it on a slide out UniStrut frame to be able work on it when needed.
If you don't know UniStrut then look up UniStrut system by HILTI and then go to your local electrical/mechanical(hvac) supplier and ask for there Erico/Hilti book?
Most likely you get Erico at an electric supply.
I ain't a salesman for anything but I am sold on Uni-strut in my commercial construction world.
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Old 02-03-2017, 05:49 PM   #9
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Metal truck bed tool box, or metal cabinet?

Good luck!
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Old 02-03-2017, 06:05 PM   #10
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If you can find a copy, Dave Galey's "Bus Converters Bible" has a great write up on generator box design & construction.

I sold my copy at my garage sale last summer for 50 cents...........
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