We don't install anything smaller then a 13 k its air cooled but works well, as far as the numbers you have, Mine are somewhat different I use max potential load and max potential charge as when the batteries are low the genny must not only supply the home but also charge the bank back up at a reasonable rate, so if the loads are high and the genny only has enough to maintain that load then what about the batteries plus I only use 75% of the genny rating for optimum or improved duty cycle. This is only me and I am sure every shop has there own math. Jerry
On Wed, Apr 8, 2015 at 11:23 AM, Dana <[email protected]> wrote: > 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* - [email protected] - *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. > > > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > >
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