Running a generator in an enclosed space
Running a generator in an enclosed space
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Discussion

Nigel_O

Original Poster:

3,891 posts

250 months

My mother and stepfather often get power cuts in their village. They’ve bought a 6kw semi-portable generator and they are having it professionally connected to their mains.

https://www.parkerbrand.co.uk/6-87-kva-portable-pe...

However, they’ve put the generator in a small (6’ x 4’) storeroom. It has a single door facing the garden and no other ventilation. They expect it to run with a small vent cut into the UPVC door. I reckon it will quickly choke on its own exhaust fumes, as a single vent cannot possibly get rid of the exhaust fumes AND pull in enough fresh air to run properly.

Am I right to be concerned?

Jo-say8k

343 posts

47 months

Yes.
Both for the generator and anybody that goes in there.
Can you extend the exhaust pipe somehow?

hidetheelephants

36,269 posts

224 months

It will choke itself quite quickly, either leave the door open when running or fit some form of forced draft ventilation. Even a bathroom/shower fan would probably suffice.

OutInTheShed

14,846 posts

57 months

It's a petrol generator?

Sorry but running that in anything more enclosed than a garage with the big door open is @*&& bonkers.

Not only issues with carbon monoxide and all that, but the heat build up from a 6kW engine will be dangerous.

Also note the warning about running LED lights and digital things. To some extent that will be arse covering but it's not completely baseless.

hidetheelephants

36,269 posts

224 months

That's just arse-covering as it's not a stabilised supply; anything running from a decent switch-mode supply will be fine, but a non-zero risk of christmas-cracker quality appliances frying themselves. I didn't register the size of it though, it will need a fairly chunky ventilator, a bathroom sized one would not suffice.

OIC

624 posts

24 months

Not an inverter genny so can't run sensitive equipment like PC, laptop, possibly router (not sure).

I have an inverter genny but it's fecking noisy and only to be used when we've lost power for more than 6 hours on a cold, dark, snow filled day.

So soon then.

Otherwise I just look at it now and again.

If WWIII starts then I fully expect the neighbours to be at my door with shotguns as they have them, but not a genny.

How many tins of beanz is a genny worth?

Do you like gherkins?

Regbuser

7,029 posts

66 months

As ever, what does the MI (manufacturer's instructions) say about requirements for inlet and exhaust ventilation arrangements ?

OutInTheShed

14,846 posts

57 months

hidetheelephants said:
That's just arse-covering as it's not a stabilised supply; anything running from a decent switch-mode supply will be fine, but a non-zero risk of christmas-cracker quality appliances frying themselves. I didn't register the size of it though, it will need a fairly chunky ventilator, a bathroom sized one would not suffice.
I'd say it's 90-something % arse-covering and the rest, I could understand why things might be damaged.

The air cooling requirements would not be trivial.

dhutch

17,907 posts

228 months

Is this storeroom attached to the house at all, or a standalone outbuilding. Away from the house?

As said, unless you pipe exhaust out, even the whole door might be borderline.

Generally attaching exhaust extensions to these sorts of things is at best a grey area and ir frowned upon. But as long as the only side effect of it failing is a sooty store room and choking generator (rather than, say, death by carbon monoxide) the risks are obviously lower.


Jo-say8k

343 posts

47 months

I was thinking if you had the exhaust sealed into a larger steel duct and exited outside that would be ok?

Duckboard

33 posts

1 month

Cant they just stand it inside by the open shed door as that should give plenty of ventilation

Simon_GH

1,014 posts

111 months

Would a battery be a safer option?