Picture of Enclosure for a Generator
This Instructable is all about building a box for my new generator. We couldn't really afford an inverter type generator to run the stuff we want to (airconditioner, fridges and freezers), so it a standard older type wired into the house. The box's main purpose is to help redirect/muffle the sound a little and also to help protect it from the weather. I chose to pour a concrete slab for it to sit upon and make the walls out of concrete blocks with the cores filled in with concrete to help make it denser and should reduce the noise a little.

Things I also had to consider included; placement, how well blended in it would be, airflow around the generator, weatherproofing and exhaust gases.

This unit is designed to be wired into the fuse box of the house, I hired an electrician to do this part and put the input power outlet near where I was putting the box. Its on the beam in the corner behind the box, you may see it in some pics.

The end result is as per the attached picture.

Stuff you will need:

Cement, sand, aggregate and water
wheelbarrow or cement mixer
concrete smoothing device such as trowel and piece of wood
something to hold the form-work, stakes, pegs etc

Box part:
blocks to make walls
wood of some sort to make door and roof
ventilation type fans

Generator parts:
earthing rod (available from electrical supplies shops)
some cable to wire to the earth
handles, hinges

Safety gear:
Dust mask - cement powder can be a little nasty
Gloves - again with the cement powder, I didnt use them, but I had a hose and washed off anything that got on me
Water - needed for the concrete mix, but also good to replace fluids as you work
Tarp - shade, rain protection etc
jayrodpa9 months ago

Since the generator is a portable and the fuel take is on top I would think that the tank would restrict upward air flow and cause the heat to flow from the sides. wouldn't it be better to create cross air flow by putting the fans on the sides. one intake and one exhaust.

northernmenace (author)  jayrodpa9 months ago

Possibly yes, though that would make the box more complex by having to fit the fans into the brickwork. It would also allow sound through to the sides. I went with up to redirect it away from the house a little.

jayrodpa9 months ago

that's fuel tank not take.

juanangel3 years ago
I bet your generator is using a lot of fuel. The two fans is a great idea but; use one of them to feed clean cool air to the generator, as heat raises it will not need much help to get out. Use a clothe drier duct to get clean air to the carburetor. You do not need to wrap it around the carburetor or make any removal of parts. On the exhaust fan use the same kind of duct tube but this time use an "s" figure to prevent some noise from escaping out the exhaust fan. (By the way i used plastic plumbing {PVC} for mine) Make sure it is placed on the top part, not hanging down or the hot air stays inside.
tinker2343 years ago
wow that is amazing could it be made of metal
northernmenace (author)  tinker2343 years ago
Definitely! I used brick filed with concrete to try and absorb the sound a bit. A thin later of metal may only amplify the sound. Perhaps a layer of carpet or sound absorption foam thats heat proof. Plastic or wood should work as well, though again, may need something else to help the sound blocking.
oh thanks i meant on the outside to protect the engine
northernmenace (author)  tinker2343 years ago
Oh, yep for sure!
Good idea. I will probably make one when things finally dry up.
How well does the concrete muffle the noise?
northernmenace (author)  rocketman2213 years ago
Its not too bad, I havent had a test where Ive had to sleep as yet, but it is a noticeable difference from inside the house. The plastic on top is letting a bit escape though so will have to find something else for that. I knew Id get some out the fans due to their size, but expected less. Im thinking I might whip something up with wood and see how it goes.