I agree but full load charging usually only lasts but a few minutes as the inverter charge rate drops readily as voltage rises. 8300 watt -10,000 watts or 13000 watts the point is why we are installing air cooled throw away generators that run so fast & hot that they need to be replaced in 2,000 hours, not to mention the fuel consumed at 80 MPH?
Is there a slow speed (1200-1800 rpm) water cooled 8-13 KW generator out there? ---------------------------------------------------------------------------- Dana Orzel Great Solar Works, Inc - NABCEP # 051112-136 E - [email protected] - Web - solarwork.com O - 970.626.5253 C - 208.721.7003 "Responsible Technologies for Responsible People since 1988" P Please consider the environment before printing this email. From: Jerry Shafer [mailto:[email protected]] Sent: Wednesday, April 08, 2015 7:02 PM To: [email protected]; RE-wrenches Subject: Re: [RE-wrenches] Question on Back up generators 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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