Generator shed

[fatjay]

I found it. 10/8kw vs 7.5/6kw, I picked a 10k because I wanted the capability. I'm not seeing a gasoline/diesel version of this model though?

http://gens.generac.com/generaccorp...-generators-powerpact-7kw_sell-sheet-2017.pdf

 

[hr3]

Don't forget to do the calculations on your cooling of the room to make sure your fan is big enough, I think I used 34,000 btu per hp for mine..

 

[Sawyer Rob]

I bought this Kubota diesel a couple weeks ago,

It makes 40hp at 2,800rpms MAX, 35hp continuous... It also makes 25hp at 1,500rpms and the torque is FLAT!!!

I'm thinking about buying a generator head for it and making a whole house gen set out of it, I just need to figure out what brand 1800rpm generator head to buy, if I hook it direct, I'll have to run it at 1,800rpms, OR I could belt it a bit lower...

SR

 

[fatjay]

Sawyer Rob, I am working on something that. I was going to by the 10kw harbor freight gen head. You have to consider something though. You need 3600rpm at the gen head, so you need to play with pulley sizes a bit, and you can't direct drive.

 

[PILOON]

If U want it to be quiet line the interior with old carpeting (glued or stapled) to the interior walls.
The sound absorption qualities will amaze you.
A fan for cooling will also do wonders.

 

[LittleBill21]

Sawyer Rob, I am working on something that. I was going to by the 10kw harbor freight gen head. You have to consider something though. You need 3600rpm at the gen head, so you need to play with pulley sizes a bit, and you can't direct drive.

Don't do this if you care/have sensitive electronic needs. this is a warning right out of the manual for your 10k, and my 7k. " THIS GENERATOR IS NOT INTENDED TO POWER SENSITIVE ELECTRONIC EQUIPMENT WITHOUT THE ADDITION OF AN APPROPRIATE LINE CONDITIONER (SOLD SEPARATELY)."

the thd on these sucks its like <25% which is terrible (i asked HF myself). if you look at some of the links for the better generators, good generator heads are 4 pole (1800 rpm) and weigh 10 times what the HF gen head weighs. VR is also like 1% mine moves around quite a bit. THD is also under 2.5%

normally i don't read into this stuff much, but i have a bunch of cheap UPS for computer equipment. They HATE my HF genny, and constantly cycle between battery and line power.

If your going to spend the time to throw a good diesel in front of a gen head, spend the money to make sure your house is actually going to like the power it see's.!

 

[Sawyer Rob]

Sawyer Rob, I am working on something that. I was going to by the 10kw harbor freight gen head. You have to consider something though. You need 3600rpm at the gen head, so you need to play with pulley sizes a bit, and you can't direct drive.

You only need 3,600rpm's "IF" you buy a 2 pole generator head...

You need 1,800rpm if you buy a 4 pole generator head.

4 pole heads are a much better designed, longer lasting head and that would be my first choice...

You can direct drive a 4 pole head and run the engine at 1,800...

I've read some not so good things about HF gen heads, so I'm not even considering one of those...

SR

BTW, after my LAST post, the power went out for 6+ hours...

 

[buickanddeere]

direct drive and save yourself some headaches.

 

[chim]

Maybe the smaller generators would be OK without it, but I'd be a lot more comfortable with an insulated thimble where the exhaust pipe goes through wood. If noise is a concern, I'd use the brown rockwool insulation and stay away from any combustibles. Maybe drywall on top of the insulation if you have mice. On the bright side, it does look like you have a masonry wall between the generator enclosure and your living space in case anything would go awry.

 

[WilliamTO-35]

I'm not sure why, but small volume outbuildings tend to build up condensation and cause things to rust. It's probably due to inadequate ventilation , and/or being shut off from heating sources that keep the space above the condensation temperature. Since water vapor rises in the presence of air, bottom to top passive or powered ventilation may be a key. As most of us have observed, just covering something with a plastic tarp doesn't preserve it very well. But using the tarp in an open ended ^ tent design works better.

 

[jenkinsph]

Make sure you have plenty of air circulation for this generator. A small exhaust fan in not enough for this project.

 

[coldsteelva]

I would think a roof mounted mushroom ventilator with intake grates on the low side of the shed would be best.

 

[EddieWalker]

I would think a roof mounted mushroom ventilator with intake grates on the low side of the shed would be best.

I did something like this for my metal shipping container and it made a huge difference. Vent down low for intake, and then up high to create air flow. Before, I was dealing with mold on just about everything. Now, after five years, I almost forgot about the mold issue I used to have.

 

[CobyRupert]

FYI: If you look at the power adapter for many "sensitive electronics", you can see they really aren't sensitive at all. Example I can plug in my computer into any receptacle that has a range of 100V-240V, 50hz or 60hz, it doesn't care. Most electronics power supplies take whatever AC input you give it and rectifies / converts it to a low (example 6, 9 or 12vdc ) DC voltage.

 

[Industrial Toys]

If I had to buy a generator end for a small Diesel, it would be nothing but a Stamford. Genuine, not knockoff. Buy the adapter plate for the particular engine, that takes it to SAE and bolt on the end. Don't rely on junk when you rely on it. There's always enough other stuff to go wrong anyway.

Where my main genset exhaust leaves the building, I used an old four bolt bearing housing, without the bearing. Filled the space with high temperature silicone, so it would not transfer heat to the wood wall and would sound isolate it somewhat.

 

[Industrial Toys]

A few pics of my (I thought) engenius solution. More then a few places around here have burned from generator exhaust.

 

[buickanddeere]

As previously pointed out , condensation is a problem in generator shacks . As previously dated the exhaust should use an insulated thimble . The hot air should exhaust through a set of gravity dampers that the rad fan blows open. The cool air inlet should also be gravity dampers that are drawn open from airflow.
A little bit of warmth to keep the inside of the generator shack 2-5 degrees warmer that outside will prevent condensation. A good source of heat is a coolant heater in the engine . Also allows the engine to rev up to full speed and take full load immediately .
A 600watt 240V block heater wired to 120V will make 150watts of heat and last for decades without burning out.

 

[EddieWalker]

How often will the generator be used? If it's for emergencies, I wouldn't spend the money on any fancy venting system. Just leave the door open when you run it if there is a concern.

 

[aczlan]

A 600watt 240V block heater wired to 120V will make 150watts of heat and last for decades without burning out.

Might want to recheck your math...
A 600W heater (@240VAC) would pull 300W @120VAC.

Aaron Z

 

[buickanddeere]

Might want to recheck your math...
A 600W heater (@240VAC) would pull 300W @120VAC.

Aaron Z

Oh'Contrair . Check again, a 240V , 600watt heater on 120V will produce 150watts of heat .