[RE-wrenches] Question on Back up generators

[Dana]

Hey All - 

 

I just got off of a phone call with my Onan generator supplier. Last
conversation with Kohler was the same story basically.

 

I was informed that their smallest water cooled generator, the RS22 (22 KW)
is now no longer "rated "for off grid. They actually called me to confirm
that this generator was for backup power to a utility inter connected house.
Tier 4 generators in the EPA CFR 40 is the Federal code what covers this, &
you are allowed 100 hours of run time for standby power and maintenance per
year. 

Q - Why am I using ridiculous sized generators for something that an 82-8300
watt generator does just fine?

A - The EPA current requirements, a shrinking economy, & manufacturers that
have to meet very expensive air quality compliance. 

The Penalty - If you get caught running a "standby power only" generator the
fine is now $39,000 per day! 

Now I am far from a polluting kind of individual and all for air quality but
this is getting the best of us. The 13KW air cooled generators are only good
for 2000 hours, & the water cooled go 20 years of moderate usage but cost a
boat load. I hate having the "Generator" talk with a new client they look at
me like I am crazy. So the air cooled units are basically throwaways and the
22KW units are way more than we need and what a client needs to spend money
on, unless you are at 10,000 ft el.

 

If you figure 30 amps/120 VAC input per inverter +/- x 2 = 7.2KW plus say
10-15% fudge or elevation factors would require an 8200-8300 watt generator.
Air cooled at 3600 RPM = 80 MPH & 1800 RPM = 40 MPH.  Even if the generator
were a bit smaller, ran slow (1200-1800 rpm) and ran a bit longer that would
be acceptable. 

So, why are we installing even 13KW air cooled or 22 KW water generators?

There is a business opportunity here folks.

 

What are you all installing?

Why?

Is it reliable?

Would you use it on your house?

 

Thanks for sharing all the wisdom and knowledge.

 

----------------------------------------------------------------------------

Dana Orzel 

Great Solar Works, Inc -  NABCEP # 051112-136

E - dana at solarwork.com  - Web - solarwork.com 

O - 970.626.5253  C - 208.721.7003 - No FAX Line

"Responsible Technologies for Responsible People since 1988"  

P Please consider the environment before printing this email.

 

 

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