Generators

[Techno Freak]

Hello
I am looking for diesel generators (And anything need to change from mains to generator). What stuff wuold I need and where would I get it. I would also like some price estimates.
Jamie

[gothambus]

In simplest terms, you need the generator and a transfer switch.

If you're providing standby power to your datacenter, forget buying a generator at the local Home Depot. You'll want a genset with electronic start that can be kicked on by your transfer switch, and you'll definitely want a genset with an isochronous governor to keep your power as clean as it can be with respect to frequency.

Also, make sure your transfer switch is the automatic type and that it allows for regular excersizing and testing of the generator.

How large is the load you want to run? Is diesel your only choice, or is natural gas available? There are quite a few basic questions that need to be answered before you start your project.

We just did a small Kohler natural gas genset (50 kW) for about $30K, including all the feeder work and such.

[kjbaudry]

Sounds like the first stop would be a Professional Engineer to help you size the generator, design the installation and prebare permit/construction drawings.

There are a lot of codes that must be met and design considerations such as:

Size (Kva vs. Kw, harmonics, etc.)
Location,
Fuel Type (Diesel, Nat Gas, Propane - Run Time),
Fueling (capacity, spill containment, etc..),
Closed transition vs open transition,

[Dennis Nugent]

Generally you want a diesel generator -- more efficient and reliable then propane. In siesmic areas you would not want natural gas...

KW = 0.85 x KVa as a general rule of thumb

Pricing is around $500 - $600/kW for medium sized diesel generators. Installation will depend on distance from the generator to the meter and UPS, unions, etc.

The other significant factor is permitting -- especially in the stringent Air Quality Districts